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1
Fernandez, Javier Oscar. "The Virginia Tech Calibration System". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32669.
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Phasor measurement unit (PMU) applications on power grid monitoring systems have been implemented since the early ninetyâ s. Large monitoring system network performance relies on the consistent measurements of PMUs across the system. This has become a major challenge for designers since large networks use PMUs from various manufacturers who likely implement different synchrophasor technologies to perform the phasor estimations. The current synchrophasor standard, the IEEE C37.118-2005 Synchrophasor Standard, covers adequately the steady-state characterization of PMUs but does not specify transient condition requirements. The North American Synchrophasor Initiative (NASPI) has developed a guide outlining the several tests required for dynamic characterization of PMUs. The National Institute of Standards and Technology (NIST) developed two PMU testing stands for steady-state conformance with the current standard and for dynamic performance testing. Since May 2010, Virginia Tech has been working closely with the NIST in developing a PMU testing system similar to the NIST designs for commercial testing of PMUs and research purposes, the Virginia Tech Calibration System. This thesis focuses on assessing the system accuracy differences between the designs, and the software interface modifications to adapt the new hardware.Master of Science
2
Mostek, Nick. "Calibration system design and determination of filter calibration requirements for SNAP". [Bloomington, Ind.] : Indiana University, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3278455.
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Thesis (Ph. D.)--Indiana University, Dept. of Astonomy, 2007.Source: Dissertation Abstracts International, Volume: 68-10, Section: B, page: 6711. Adviser: Stuart Mufson. Title from dissertation home page (viewed May 20, 2008).
3
Peng, Tao. "Reflectivity Measurement System Development and Calibration". The University of Waikato, 2007. http://hdl.handle.net/10289/2301.
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Accurate assessment of road luminance provided by overhead streetlights helps to optimize the visibility of objects on the road and therefore promotes driver safety, while minimizing energy consumption. To calculate road luminance, the road surface reflectivity has to be known. Odyssey Energy Limited has developed a prototype system that has the potential to determine the road reflectivity properties at high speed. In this thesis, an investigation into the prototype system has been conducted and further enhancement and redesign has been done. A portable on-site road surface reflectivity measurement system that complies with the Commission Internationale de I' Eclairage (CIE) standard was developed. The road test of this new system has been carried out on a series of Hamilton city roads. It proved that the new system is capable of measuring the road surface reflectivity and classifying the road into its appropriate R class according to the CIE standards specified in street lighting design criteria. Later the OEL prototype system was calibrated against the new system to find out the correlation between the two systems.
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Pieralli, Francesca <1979>. "LBT AO system: tests and calibration". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2390/.
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An Adaptive Optic (AO) system is a fundamental requirement of 8m-class telescopes. We know that in order to obtain the maximum possible resolution allowed by these telescopes we need to correct the atmospheric turbulence.
Thanks to adaptive optic systems we are able to use all the effective potential of these instruments, drawing all the information from the universe sources as best as possible.
In an AO system there are two main components: the wavefront sensor (WFS) that is able to measure the aberrations on the incoming wavefront in the telescope, and the deformable mirror (DM) that is able to assume a shape opposite to the one measured by the sensor. The two subsystem are connected by the reconstructor (REC).
In order to do this, the REC requires a “common language" between these two main AO components. It means that it needs a mapping between the sensor-space and the mirror-space, called an interaction matrix (IM). Therefore, in order to operate correctly, an AO system has a main requirement: the measure of an IM in order to obtain a calibration of the whole AO system.
The IM measurement is a 'mile stone' for an AO system and must be done regardless of the telescope size or class.
Usually, this calibration step is done adding to the telescope system an auxiliary artificial source of light (i.e a fiber) that illuminates both the deformable mirror and the sensor, permitting the calibration of the AO system. For large telescope (more than 8m, like Extremely Large Telescopes, ELTs) the fiber based IM measurement requires challenging optical setups that in some cases are also impractical to build. In these cases, new techniques to measure the IM are needed.
In this PhD work we want to check the possibility of a different method of calibration that can be applied directly on sky, at the telescope, without any auxiliary source. Such a technique can be used to calibrate AO system on a telescope of any size.
We want to test the new calibration technique, called “sinusoidal modulation technique”, on the Large Binocular Telescope (LBT) AO system, which is already a complete AO system with the two main components: a secondary deformable mirror with by 672 actuators, and a pyramid wavefront sensor.
My first phase of PhD work was helping to implement the WFS board (containing the pyramid sensor and all the auxiliary optical components) working both optical alignments and tests of some optical components. Thanks to the “solar tower” facility of the Astrophysical Observatory of Arcetri (Firenze), we have been able to reproduce an environment very similar to the telescope one, testing the main LBT AO components: the pyramid sensor and the secondary deformable mirror. Thanks to this the second phase of my PhD thesis: the measure of IM applying the sinusoidal modulation technique. At first we have measured the IM using a fiber auxiliary source to calibrate the system, without any kind of disturbance injected. After that, we have tried to use this calibration technique in order to measure the IM directly “on sky”, so adding an atmospheric disturbance to the AO system.
The results obtained in this PhD work measuring the IM directly in the Arcetri solar tower system are crucial for the future development: the possibility of the acquisition of IM directly on sky means that we are able to calibrate an AO system also for extremely large telescope class where classic IM measurements technique are problematic and, sometimes, impossible.
Finally we have not to forget the reason why we need this: the main aim is to observe the universe. Thanks to these new big class of telescopes and only using their full capabilities, we will be able to increase our knowledge of the universe objects observed, because we will be able to resolve more detailed characteristics, discovering, analyzing and understanding the behavior of the universe components.
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Woschitz, Helmut [Verfasser]. "System Calibration of Digital Levels: Calibration Facility, Procedures and Results / Helmut Woschitz". Aachen : Shaker, 2003. http://d-nb.info/1170544592/34.
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Lindén, Erik. "Calibration in deep-learning eye tracking". Licentiate thesis, KTH, Reglerteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-295566.
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Personal variations severely limit the performance of appearance-based gaze tracking. Adapting to these variations using standard neural network model adaptation methods is difficult. The problems range from overfitting, due to small amounts of training data, to underfitting, due to restrictive model architectures. In this thesis, these problems are tackled by introducing the SPatial Adaptive GaZe Estimator (\spaze{}). By modeling personal variations as a low-dimensional latent parameter space, \spaze{} provides just enough adaptability to capture the range of personal variations without being prone to overfitting. Calibrating \spaze{} for a new person reduces to solving a small optimization problem. \spaze{} achieves an error of \ang{2.70} with \num{9} calibration samples on MPIIGaze, improving on the state-of-the-art by \SI{14}{\percent}. In the introductory chapters the history, methods and applications of eye tracking are reviewed, with focus on video-based eye tracking and the use of personal calibration in these methods. Emphasis is placed on methods using neural networks and the strengths and weaknesses of how these methods implement personal calibration.QC 20210528
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Seierstad, Johanne. "Design system for primary calibration of flow". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23595.
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Whilst growing demand for energy in Nepal and neighbouring- countries, investments in hydro- power projects appears continuously, both by local and multinational companies. As a consequence of this, Turbine Testing Lab was founded in 2011 at Kathmandu University in Nepal. The laboratory is rapidly developing, and is currently implementing a Francis turbine test rig. A long- term goal for the laboratory, is to execute model tests according to IEC 60193, which is the standard used in model tests of hydraulic runners.When determining the hydraulic efficiency of a runner, a central parameter is the discharge measurement. According to IEC, any secondary device used to measure the discharge shall be calibrated in sitù against one of the following primary methods: the weighing method, volumetric method or the moving- screen method.The aim of this work has been to develop and design a primary method for calibration of the flowmeter at TTL. Based on an evaluation of the mentioned primary methods, as well as economy, accuracy and correspondence with technical staff, a volumetric method is chosen as calibration principle. The principle of the method is based on collecting water into a tank with a known geometry, and by execution of level- and time measurements calculating the discharge.The calibration rig consists of a flowmeter, inlet nozzle, deflector mechanism, emergency weir, calibration tank, level measurement, time measurement, drainage system, emergency weir, and an upgraded pipe run at the measuring section of the flowmeter.It is developed a LabView program, for logging and processing the voltage output from the flowmeter. The other measurements executed is registered manually in a separate calibration sheet for data processing. An evaluation of the accuracy in the calibration method is conducted, which may be used to determine the total uncertainty when the calibration facility is installed. Provided design and installation according to ISO 8316, the accuracy in discharge measurement with the volumetric method lies within $\pm$ 0,1- 0,2 \%. The major uncertainty contribution in the method lies in the determination of the volume collected, and the corresponding tank calibration.It is proposed to reduce the diameter of the flowmeter from original size of 400 mm to 250 mm. Reduction in diameter and upgraded pipe run will increase accuracy of the flow measurement, a result of improved flow pattern at the measuring section. When the primary calibration rig is installed at TTL, this will be a large step towards an IEC- approved laboratory in Nepal, which open doors against an international market.
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Needham, Richard Lee. "Calibration of strapdown system accelerometer dynamic errors". Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/47358.
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Aldoumani, Anoor. "Calibration enhancement of non-linear VNA system". Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/100407/.
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Communication systems are generally found wherever data is to be transmitted from point-to-point or from a point to many points. It is impossible to imagine modern life without communication systems such as radio, telephone, TV, Satellite and etc. The transmission of information from one place to another requires an operation or other alteration to be sent through an electrical signal; the same principle applies for the receiving terminal. Modern life requires that efficient wireless communication systems for long range transmission be built, therefore, base-stations must use high power transistors almost exclusively. Furthermore, modern cellular communication systems also need to transmit across long distances, hence, to achieve this aim successfully, a radio frequency (RF) power amplifier is employed. That is considered to be a key element of any wireless communication system. Efficient communication systems must have minimum spectral re-growth, interference and employ linear. Signal amplification is one of the core circuit functions in modern microwave and RF systems. The Power Amplifier (PA) is a key element in the construction of all wireless communication systems. The PA uses the most current because it is the last stage in the transmission chain. In modern PA design, the RFPA designer must have accurate S-parameter data for the DUT, thereby allowing the creation of an accurate system model and to reduce the re-design and rework effort. The ultimate aim of the research work presented in this thesis is to achieve improvement in the accuracy of a waveform measurement system by increasing the accuracy of the small-signal calibration used. This involved removing the phase reference from the NVNA during calibration and operation, which in turn removes the bandwidth and frequency limitations that the phase reference imposes, as well as reducing the complexity of the overall system. Essential contributions to this research work concentrated in two areas; firstly, developments that allow for Enhanced Vector Calibration of Load-pull measurement systems, especially near the edge of the Smith Chart, and secondly, the operation and Anoor Aldoumani Abstract IV calibration of a VNA-based large-signal RF I-V waveform measurement system without using a harmonic phase reference standard. The first research area described in this thesis involved investigating the prospect of improving vector measurement accuracy, especially near the edge of the Smith Chart, by using load pull technology. Increased measurement error near the edge of the Smith chart was observed during calibration. To help correct this, the realisation of novel optimization that increases the accuracy of all the raw data which was collected during calibration process and therefore increases the accuracy of calibration at reflection coefficients close to unity. This research work focuses on taking advantage of the load-pull capability during calibration, this reduces the effect of measurement errors on the raw data when measuring the calibration standards before being applied in traditional LRL/TRL calibration algorithms. Leading to time proved measurement accuracy and eliminates the requirement to use complex optimisation algorithms post calibration. The second concept developed simplifies the NVNA architecture and removes the complexities and bandwidth limitations introduced when employing a harmonic phase reference generator. A key capability of the Rohde and Schwarz ZVA-67 VNA is that it incorporates internal signal and local oscillator sources and employs direct digital synthesis was exploited to advantage allows the Vector Network Analyzer to be operated as a NVNA without the need for a harmonic phase reference generator. This is due to such a Vector Network Analyzer based NVNA configuration provided a system with both coherent receivers and sources. This feature combined with a modified calibration procedure, means that during calibration only the internal signal sources and an external phase meter are required during measurement. All the internal signal sources and receiver port are available to measure, also now since no phase reference required, bandwidth and functionality issues and avoided.
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Kapelan, Zoran. "Calibration of water distribution system hydraulic models". Thesis, University of Exeter, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370011.
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A number of mathematical models are used nowadays to describe behaviour of the reallife water distribution system (WDS). It is a well known fact that, to have any meaningful use, any WDS mathematical model must be calibrated first. Here, calibration is defined as process in which a number of WDS model parameters are adjusted until the model mimics behaviour of the real WDS as closely as possible. In this thesis, WDS mathematical models that are used to model water quantity aspect only are analysed. Three hydraulic models considered here are: (1) steady-state flow model, (2) quasi-steady flow (extended period simulation) model and (3) unsteady flow model. The calibration problem analysed here is formulated as a constrained optimisation problem of weighted least square type with the objective defined in a way that enables effective incorporation of prior information on calibration parameters. WDS calibration problem is then analysed in detail, including special issues of identifiability, uniqueness and stability of the problem solution. A list of diagnostic and other statistics and analysis is presented to improve existing calibration approaches by providing partial insight into the calibration process. Calibration of WDS hydraulic models is further improved by the development of new hybrid optimisation method. Being closely related to calibration, the problem of sampling design for calibration of WDS hydraulic models is also addressed here. First, sampling design is formulated as a constrained two-objective optimisation problem. Then, two novel models are developed to solve it. The first model is based on standard, single-objective Genetic Algorithms (SOGA). The second model is based on multi-objective Genetic Algorithms (MOGA). Finally, all novel methodologies presented here are verified successfully on multiple case studies that involve both artificial and real-life WDS. At the end, relevant conclusions are drawn and suggestions for further research work are made.
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Jansson, Sebastian. "On Vergence Calibration of a Stereo Camera System". Thesis, Linköpings universitet, Institutionen för systemteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-84770.
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Modern cars can be bought with camera systems that watch the road ahead. They can be used for many purposes, one use is to alert the driver when other cars are in the path of collision. If the warning system is to be reliable, the input data must be correct. One input can be the depth image from a stereo camera system; one reason for the depth image to be wrong is if the vergence angle between the cameras are erroneously calibrated. Even if the calibration is accurate from production there's a risk that the vergence changes due to temperature variations when the car is started. This thesis proposes one solution for short-time live calibration of a stereo camera system; where the speedometer data available on the CAN-bus is used as reference. The motion of the car is estimated using visual odometry, which will be affected by any errors in the calibration. The vergence angle is then altered virtually until the estimated speed is equal to the reference speed. The method is analyzed for noise and tested on real data. It is shown that detection of calibration errors down to 0.01 degrees is possible under certain circumstances using the proposed method.
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Sjöholm, Daniel. "Calibration using a general homogeneous depth camera model". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204614.
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Being able to accurately measure distances in depth images is important for accurately reconstructing objects. But the measurement of depth is a noisy process and depth sensors could use additional correction even after factory calibration. We regard the pair of depth sensor and image sensor to be one single unit, returning complete 3D information. The 3D information is combined by relying on the more accurate image sensor for everything except the depth measurement. We present a new linear method of correcting depth distortion, using an empirical model based around the constraint of only modifying depth data, while keeping planes planar. The depth distortion model is implemented and tested on the Intel RealSense SR300 camera. The results show that the model is viable and generally decreases depth measurement errors after calibrating, with an average improvement in the 50 percent range on the tested data sets.Att noggrant kunna mäta avstånd i djupbilder är viktigt för att kunna göra bra rekonstruktioner av objekt. Men denna mätprocess är brusig och dagens djupsensorer tjänar på ytterligare korrektion efter fabrikskalibrering. Vi betraktar paret av en djupsensor och en bildsensor som en enda enhet som returnerar komplett 3D information. 3D informationen byggs upp från de två sensorerna genom att lita på den mer precisa bildsensorn för allt förutom djupmätningen. Vi presenterar en ny linjär metod för att korrigera djupdistorsion med hjälp av en empirisk modell, baserad kring att enbart förändra djupdatan medan plana ytor behålls plana. Djupdistortionsmodellen implementerades och testades på kameratypen Intel RealSense SR300. Resultaten visar att modellen fungerar och i regel minskar mätfelet i djupled efter kalibrering, med en genomsnittlig förbättring kring 50 procent för de testade dataseten.
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Rovner, Barry Arthur 1957. "AN IMAGE PROCESSOR BASED SYSTEM FOR BLACKBODY CALIBRATION". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276398.
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Lord, Martin Edmund. "An improved, adaptive calibration system for weather radar". Thesis, Lancaster University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286979.
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Pinheiro, Ivo dos Santos. "Automatic calibration of the CAMBADA team vision system". Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2179.
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Cook, Henry Ernest IV. "PERCEPTUAL-SYSTEM CALIBRATION IN INTERACTIVE TELE-OPERATED ENVIRONMENTS". Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1429878120.
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Chang, Jon Carlton 1963. "Modification and calibration of a solar spectroradiometer system". Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276858.
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A solar spectroradiometer is an instrument used for measuring the transmitted solar radiation on a quasi-continuous basis. An existing computer controlled solar spectroradiometer system has been modified and made operable. Test measurements have shown that the signal to noise ratio (which is time of day and wavelength dependent) is at an acceptable level. The chief use of the spectroradiometer will be for atmospheric transmittance studies, which will require calibration of the instrument. Strategies for calibrating the instrument have been discussed.
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Isoz, Wilhelm. "Calibration of Multispectral Sensors". Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5202.
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This thesis describes and evaluates a number of approaches and algorithms for nonuniform correction (NUC) and suppression of fixed pattern noise in a image sequence. The main task for this thesis work was to create a general NUC for infrared focal plane arrays. To create a radiometrically correct NUC, reference based methods using polynomial approximation are used instead of the more common scene based methods which creates a cosmetic NUC.
The pixels that can not be adjusted to give a correct value for the incomming radiation are defined as dead. Four separate methods of identifying dead pixels are used to find these pixels. Both the scene sequence and calibration data are used in these identifying methods.
The algorithms and methods have all been tested by using real image sequences. A graphical user interface using the presented algorithms has been created in Matlab to simplify the correction of image sequences. An implementation to convert the corrected values from the images to radiance and temperature is also performed.
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Chen, Yi-Chun. "System Calibration and Image Reconstruction for a New Small-Animal SPECT System". Diss., The University of Arizona, 2006. http://hdl.handle.net/10150/195464.
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A novel small-animal SPECT imager, FastSPECT II, was recently developed at the Center for Gamma-Ray Imaging. FastSPECT II consists of two rings of eight modular scintillation cameras and list-mode data-acquisition electronics that enable stationary and dynamic imaging studies. The instrument is equipped with exchangeable aperture assemblies and adjustable camera positions for selections of magnifications, pinhole sizes, and fields of view (FOVs). The purpose of SPECT imaging is to recover the radiotracer distribution in the object from the measured image data. Accurate knowledge of the imaging system matrix (referred to as H) is essential for image reconstruction. To assure that all of the system physics is contained in the matrix, experimental calibration methods for the individual cameras and the whole imaging system were developed and carefully performed. The average spatial resolution over the FOV of FastSPECT II in its lowmagnification (2.4X) configuration is around 2.4 mm, computed from the Fourier crosstalk matrix. The system sensitivity measured with a ⁹⁹ᵐTc point source at the center of the FOV is about 267 cps/MBq. The system detectability was evaluated by computing the ideal-observer performance on SKE/BKE (signal-known-exactly/background-known-exactly) detection tasks. To reduce the system-calibration time and achieve finer reconstruction grids, two schemes for interpolating H were implemented and compared: these are centroid interpolation with Gaussian fitting and Fourier interpolation. Reconstructed phantom and mouse-cardiac images demonstrated the effectiveness of the H-matrix interpolation.
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Andersen, R. y W. Wendel. "An Auto-Calibration System for a Longitudinal Magnetic Recorder". International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614661.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaMultiple channel magnetic tape recording is often used for signal analysis of intelligence and telemetry data. To insure accuracy of the reproduced data, these systems require frequent calibration and alignment. As the number of tracks on these systems has increased, this task has become more time-consuming. Even with a well-trained technician, this task can take several hours at a minimum. To alleviate this problem, we developed a system for performing this calibration automatically. The implementation utilizes a Fast-Fourier-Transform technique to analyze the output of a pre-recorded signal on tape. The desired response, most frequently defined by IRIG Standards, is stored in a look-up table in the machine. The actual response is compared to that desired, and, under micro-processor control, adjustment made in the signal channel until an acceptable response is achieved. A unique photo-resistor technique is used in the signal path to control such parameters as gain and phase. A description of the hardware system will be given, as well as a description of the algorithms utilized for implementation.
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ANDERSEN, R. y W. WENDEL. "AN AUTO-CALIBRATION SYSTEM FOR A LONGITUDINAL MAGNETIC RECORDER". International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614853.
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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, CaliforniaMultiple channel magnetic tape recording is often used for signal analysis of intelligence and telemetry data. To insure accuracy of the reproduced data, these systems require frequent calibration and alignment. As the number of tracks on these systems has increased, this task has become more time-consuming. Even with a well-trained technician, this task can take several hours at a minimum. To alleviate this problem, we developed a system for performing this calibration automatically. The implementation utilizes a Fast-Fourier-Transform technique to analyze the output of a pre-recorded signal on tape. The desired response, most frequently defined by IRIG Standards, is stored in a look-up table in the machine. The actual response is compared to that desired, and, under micro-processor control, adjustment made in the signal channel until an acceptable response is achieved. A unique photo-resistor technique is used in the signal path to control such parameters as gain and phase. A description of the hardware system will be given, as well as a description of the algorithms utilized for implementation.
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Ward, Gregory Peter. "A calibration system for the T2K ND280 electromagnetic calorimeters". Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557421.
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Zhang, Jinlei. "Camera calibration for a three-dimensional range finding system". Virtual Press, 1995. http://liblink.bsu.edu/uhtbin/catkey/958780.
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The purpose of this project is to develop the procedures to perform the camera calibration in a three dimension range finding system. The goal is to have a system that will provide reasonably accurate range data which can be used in further three-dimensional computer vision research such as edge detection, surface recovery and object recognition. In this project, an active lighting, optical, triangulation based range finding system has been developed. The software system is designed in object oriented technology and implemented using the C++ programming language. The overall performance of the system is investigated and the system has achieved 0.5 mm (or 4%) accuracy. A review of three range data acquisition techniques is given. Based on the analysis to the current system, suggestions to future improvement are also provided.Department of Physics and Astronomy
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BARROS, WELLINGTON SANTOS. "INTERFEROMETRIC LINEAR LASER MEASURING SYSTEM CALIBRATION BY COMPARATIVE METHOD". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=3657@1.
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O presente trabalho tem por objetivo implantar um método
para calibração de sistema de medição linear por
interferometria laser por meio de comparação a um outro
sistema laser de referência. O referido método é
considerado mais simples que a calibração por componentes
realizada atualmente e, conforme demonstrado no trabalho,
apresenta confiabilidade metrológica que atende a
exatidão necessária para as aplicações dos laseres em
metrologia dimensional, vindo suprir uma necessidade
metrológica dos laboratórios credenciados pelo Instituto
Nacional de Metrologia, Normalização e Qualidade Industrial
(Inmetro) e do parque industrial brasileiro, usuários
destes sistemas de medição. A implantação do sistema para
calibração de lasers de medição foi baseada em normas
internacionais de calibração e de cálculo da incerteza de
medição e utilizou um sistema laser de referência calibrado
no Inmetro, com rastreabilidade a padrões nacionais, com as
menores incertezas possíveis. O método de medição
implantado realiza a calibração de um sistema laser por
comparação a outro utilizando medições feitas a partir do
deslocamento da mesa onde é a apoiado o prisma óptico. O
que é de fato analisado é a diferença das medições dos dois
sistemas laser para um mesmo deslocamento. Foram
registradas as diferenças das indicações de 200 mm em 200
mm de deslocamento, em um total de 2000 mm, que variaram de
0,027 µm a 0,690 µm. Foram realizadas três medições para
cada deslocamento e quatro repetições completas do
procedimento em dias diferentes, com variação do desvio
padrão de 0,009 µm a 0,098 µm e incertezas expandidas
que variaram de 0,109 µm a 0,306 µm. São apresentadas a
metodologia de calibração, cálculos das correções, fontes
de erros e cálculos da incerteza de medição para a
comparação de sistemas laseres de medição linear.The present work aims at the implementation of a calibration method for interferometric linear laser measurement systems by comparison to another reference system. The proposed method is considered simpler than the calibration by components that is carried out today at Inmetro (National Institute of Metrology, Standardization and Industrial Quality) and, as demonstrated along this work, presents the metrological reliability and accuracy necessary for several applications of lasers in dimensional metrology. This approach will supply the metrological needs of several laboratories accredited by Inmetro and of the Brazilian industry in general, users of such measurement systems, regarding cost and time of calibration. The method implemented was based on international technical standards related to calibration and uncertainty calculation and used a reference system calibrated at Inmetro, with traceability to national standards, with the lowest uncertainties that could be achieved. The said method performs the calibration of a laser system by comparison to another through measurements of the displacement of the table where the optical prism rests. What is indeed analyzed is the difference of the measurements obtained by the two laser systems for the same table displacement. The differences were recorded for each displacement of 200 mm, in a total of 2,000 mm, their variation being from 0.027 µm to 0.690 µm. The whole procedure was repeated four times, in different days, with three measurements for each displacement. Their standard deviation varied from 0.009 µm to 0.098 µm while their expanded uncertainties varied from 0.109 µm to 0.306 µm depending on the value of the displacement. The calibration methodology, correction calculation, errors sources and measurement uncertainty calculations for the linear measurement laser systems comparison are presented in this dissertation.
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Bardhan, Jaydeep Porter 1978. "Calibration of a microvision system for MEMS device characterization". Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8934.
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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.Includes bibliographical references (leaves 56-57).
With the growing use of microelectromechanical systems (MEMS), it becomes increasingly important that reliable, accurate methods for characterizing and calibrating MEMS be developed. One microsystem in need of specific characterization measurements is the polychromator, an electrically programmable, surface micromachined diffraction grating. A microvision system has been developed to measure the electromechanical behavior of the polysilicon beams that comprise this device. Proper rigor demands that the system for making characterizations should itself be characterized; its accuracy and precision should be determined, so that users may understand the possible error margins of its measurements. This thesis describes HUMS (Heavily Upsampling Microvision System), the software application developed to automate the characterization of the polychromator, and the method developed to quantify the accuracy of the HUMS application.
by Jaydeep Porter Bardhan.
M.Eng.
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Ogundana, Olatokunbo Omodele. "Automated calibration of multi-sensor optical shape measurement system". Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/33688.
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A multi-sensor optical shape measurement system (SMS) based on the fringe projection method and temporal phase unwrapping has recently been commercialised as a result of its easy implementation, computer control using a spatial light modulator, and fast full-field measurement. The main advantage of a multi-sensor SMS is the ability to make measurements for 360° coverage without the requirement for mounting the measured component on translation and/or rotation stages. However, for greater acceptance in industry, issues relating to a user-friendly calibration of the multi-sensor SMS in an industrial environment for presentation of the measured data in a single coordinate system need to be addressed. The calibration of multi-sensor SMSs typically requires a calibration artefact, which consequently leads to significant user input for the processing of calibration data, in order to obtain the respective sensor's optimal imaging geometry parameters. The imaging geometry parameters provide a mapping from the acquired shape data to real world Cartesian coordinates. However, the process of obtaining optimal sensor imaging geometry parameters (which involves a nonlinear numerical optimization process known as bundle adjustment), requires labelling regions within each point cloud as belonging to known features of the calibration artefact. This thesis describes an automated calibration procedure which ensures that calibration data is processed through automated feature detection of the calibration artefact, artefact pose estimation, automated control point selection, and finally bundle adjustment itself.
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Ng, Ferdinand. "Calibration and image formation in the ABACUS sonar system". Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5138.
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Chang, Mun Kee. "Modeling and calibration of an acoustic emission measurement system". Thesis, Massachusetts Institute of Technology, 1990. https://hdl.handle.net/1721.1/128801.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.Includes bibliographical references (leaves 128-134).
by Mun Kee Chang.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1990.
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Liu, Yang. "An indoor pedestrian localisation system with self-calibration capability". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/13474/.
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The Global Positioning System (GPS), a space-based system, employs dozens of satellites to provide location determination and navigation services around the world. However, due to the constraints to the power consuming and long-distance transmission, the strength of the GPS signal received on the mobile device is weak. Errors of the detection of the line-of-sight (LOS) propagated components of the signals are expected to be high if the users are in urban areas or in buildings, since obstacles in the surrounding environments could attenuate the LOS propagated components of the GPS signals significantly, but might upfade the multi-path components (constructive multi-path effect). Therefore, GPS should be replaced by other techniques for providing localisation services in urban areas or, especially, in indoor environments. Among all the candidates, received signal strength (RSS) location fingerprint based positioning systems attract great attentions from both the academia and industry. Usually, a time-consuming and labour-intensive site survey to collect dozens of training samples of RSS from access points (APs) in range on every reference position (RP) in the area of interest is required to build the radio map (RM), before the localisation services could be provided to users. The purpose of the thesis is to reduce the workload involved in the site survey while providing accurate localisation service from two aspects, as shown as follows. Firstly, the quantity of the training samples collected on each RP is reduced, by taking advantage of the on-line RSS measurements collected by users to calibrate the RM. The on-line RSS measurements are geo-tagged probabilistically by an implementation of particle filter to track the trajectories of the users. The employed particles in estimation of the users’ states are initialised by a supervised clustering algorithm, propagated according to the analysis of the data sourcing from inertial measurement units (IMUs), e.g., walking detection, orientation estimation, step and stepping moments detection, step length detection, etc., and corrected by the wall constraints. Furthermore, the importance weights of the particles are adjusted to reduce the negative influence of the multi-clustered distribution of the particles to the on-line localisation accuracy, by applying the on-line RSS-based localisation results when significant users' body turnings are detected. The final results confirm that the accuracy of the localisation service with the RM calibrated by the method proposed in this thesis is higher than the previously proposed approach taking advantage of expectation maximisation algorithm. Secondly, a semi-automatic site-survey method which takes advantage of a route-planning algorithm and a walking detection module to recognise automatically the index of the RP for the current site-survey task, inform the system automatically of the start/end of the process of the task on the current RP and switch automatically to the following RPs on the planned route for the following tasks. In this way, human beings' intervention to the site-survey process is greatly reduced. As a result, the errors made in the site-survey tasks, such as incorrect recognition of the index of the RP for the current task which is highly likely to occur when the technicians get absent-minded in the work, misoperations to start/end of the task for collecting RSS samples on the current RP at wrong time moments, forgetting to notify the system of the fact that the technician has moved on to the next RP, etc., are avoided. The technicians no longer feel bored or anxious in the process of fulfilment of site-survey tasks, and the working efficiency and robustness of the RM could be also improved.
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Powell, Benedict. "Emulation and calibration with smoothed system and simulator data". Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10599/.
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This thesis is concerned with structuring the statistical model with which we relate physical systems and computer simulators. The novelty of the work lies in the fact that we relate them via imagined smoothed versions of themselves, reflecting the belief that they are similar on large scales but discrepant when in comes to small scale details. Our central, paradigmatic example involves relating the planet’s climate to a climate simulator. Here the simulator is suspected to be incapable of faithfully reproducing changes in the system as time or certain physical parameters are changed by a small amount, but is still considered informative for the changes in the system over long time scales and large parameter changes.
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Söderroos, Anna. "Fisheye Camera Calibration and Image Stitching for Automotive Applications". Thesis, Linköpings universitet, Datorseende, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-121399.
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Integrated camera systems for increasing safety and maneuverability are becoming increasingly common for heavy vehicles. One problem with heavy vehicles today is that there are blind spots where the driver has no or very little view. There is a great demand on increasing the safety and helping the driver to get a better view of his surroundings. This can be achieved by a sophisticated camera system, using cameras with wide field of view, that could cover dangerous blind spots. This master thesis aims to investigate and develop a prototype solution for a camera system consisting of two fisheye cameras. The solution covers both hardware choices and software development including camera calibration and image stitching. Two different fisheye camera calibration toolboxes are compared and their results discussed, with the aim to find the most suitable for this application. The result from the two toolboxes differ in performance, and the result from only one of the toolboxes is sufficient for image stitching.
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Ozer, Huseyin Erman. "Air Data System Calibration For Military Transport Aircraft Modernization Program". Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615690/index.pdf.
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This thesis presents the calibration processes of the pitot-static system, which is a part of the air data system of a military transport aircraft through flight tests. Tower fly-by method is used for air data system calibration. Altitude error caused by the position of the static port on the aircraft is determined by analyzing the data collected during four sorties with different weight, flap and landing gear configurations. The same data has been used to determine the airspeed measurement error. It has been shown that both the altitude and airspeed errors are within the allowable limits specified by FAR 25. Same method is also used for trailing cone calibration that is used for high altitude test flights for RVSM certification.
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Trasky, Trevor Ryan. "Hydraulic model calibration for the Girdwood, Alaska water distribution system". Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/trasky/TraskyT0508.pdf.
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The possible EPA promulgation of regulations requiring flushing programs for water distribution systems to regulate water age is encouraging many utilities to develop a better understanding of their systems. This usually involves the development of a hydraulic model. For the hydraulic model to be of use it must be calibrated using collected field data. Few established guidelines exist for utilities to perform such data collection and calibration. There are many different types of data that can be collected using many different methods. There are also various model calibration methods that can be used. This study sought to develop an optimized sampling plan and calibration method for a small utility that defines the best practice for data type, location, quantity, and collection conditions. A large quantity of many data types were collected at various locations in the system. Different methods were used to calibrate the model with various data sets and the model accuracy was evaluated using a second independent data set. The effect of model input parameter accuracy and pipe grouping during calibration on overall accuracy was also investigated. Data type, location, quantity, and collection conditions had an impact on calibration accuracy. High headloss data from fire flow tests provided better calibrations than low loss data from static pressures. Carefully selected test locations resulted in more efficient calibration than evenly distributed test locations. There was found to be a point of diminishing returns when investigating the amount of data used in calibration versus calibration accuracy. Uncalibrated model input parameters such as elevations and pump characteristics also had a significant impact on model calibration accuracy.
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Vaughan, Bryan A. M. "Characterisation and calibration of the 'Stardust' dual acoustic sensor system". Thesis, University of Kent, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365211.
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Oh, Yangjin. "A/D converters with system embedded calibration for wireless applications /". May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
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Raoult, Nina. "Calibration of plant functional type parameters using the adJULES system". Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/29837.
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Land-surface models (LSMs) are crucial components of the Earth system models (ESMs) that are used to make coupled climate-carbon cycle projections for the 21st century. The Joint UK Land Environment Simulator (JULES) is the land-surface model used in the climate and weather forecast models of the UK Met Office. JULES is also extensively used offline as a land-surface impacts tool, forced with climatologies into the future. In this study, JULES is automatically differentiated with respect to JULES parameters using commercial software from FastOpt, resulting in an analytical gradient, or adjoint, of the model. Using this adjoint, the adJULES parameter estimation system has been developed to search for locally optimum parameters by calibrating against observations. This thesis describes adJULES in a data assimilation framework and demonstrates its ability to improve the model-data fit using eddy-covariance measurements of gross primary productivity (GPP) and latent heat (LE) fluxes. The adJULES system is extended to have the ability to calibrate over multiple sites simultaneously. This feature is used to define new optimised parameter values for the five plant functional types (PFTs) in JULES. The optimised PFT-specific parameters improve the performance of JULES at over 85% of the sites used in the study, at both the calibration and evaluation stages. The new improved parameters for JULES are presented along with the associated uncertainties for each parameter. The results of the calibrations are compared to structural changes and used in a cluster analysis in order to challenge the PFT definitions in JULES. This thesis concludes with simple sensitivity studies which assess how the calibration of JULES has affected the sensitivity of the model to CO2-induced climate change.
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Lloyd, Jennifer Anne. "An integrated circuit pressure sensing system with adaptive linearity calibration". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10447.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.Includes bibliographical references (p. 145-152).
by Jennifer Anne Lloyd.
Ph.D.
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Syverud, Brian (Brian Chen). "Robotic ultrasound manipulator : calibration of position and orientation measurement system". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/54489.
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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 10).
The ultimate goal of this project is to develop a fixture for holding and manipulating an ultrasound wand as adeptly as a trained technician. From the 2D slices recorded by an ultrasound transducer, a three-dimensional image can be reconstructed. To reconstruct the 3D image, position and orientation data are needed. In the interests of space and simplicity, a sensor integrating both a gyroscope and accelerometer was chosen for these measurements. Because of the inherent error induced by integrating acceleration to yield position, it was necessary to calibrate this instrument. A fixture was constructed with preset reference points for the purposes of comparison and error analysis. As expected, the measurements obtained directly from the gyroscope were sufficiently accurate to track orientation. The position values from integration of acceleration exhibited accumulation of error over time. From these data, it was clear that a secondary reference instrument is needed for accurate position measurements.
by Brian Syverud.
S.B.
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Milbocker, Michael Thomas. "The UV laser calibration system for the L3 magnetic spectrometer". Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/15022.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1986.MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.
Includes bibliographical references.
by Michael Thomas Milbocker.
M.S.
40
Elfeky, Ahmed. "Methods of calibration for different functions of a SCR-system". Thesis, KTH, Reglerteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-226592.
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The goal of this research is to try and compare different methods ofcalibration in order to tune the parameters of the pumping and tankheater monitoring functions of the AdBlue Delivery Module of a SelectiveCatalytic Reduction (SCR) system. The goal of the SCR systemis to reduce the emission of NOx gases, which are considered as greenhousegases.In a first step, while calibrating the parameters of the pumping function,a real-time calibration method has been used. The advantage inthis process is that a detailed model of the system is not needed totune it. Then, the tank heater monitoring function has been calibratedthrough simulations. The understanding of the system is better in thiscase, which could help tuning it more effectively.The results shows that both methods should ensure the proper functioningof the system. However, the parameters found in this studycould not be totally approved without being tested on vehicle, in reallifeconditions. Moreover, as the priority is to avoid the malfunctionof the system, the chosen parameters might not be the optimal ones interms of performance.With these two methods, most of the systems could be calibrated. Thechoice of the method should be done according to the initial level ofknowledge of the object of studyMålet med denna forskning är att försöka och jämföra olika metoderför kalibrering för att ställa in parametrarna för pumpen och övervakningsfunktionenhos tankvärmaren i AdBlue-leveransmodulen i en selektivKatalytisk reduktion (SCR) system. Målsättningen med SCRsystemetär att minska utsläppen av NOx-gaser, vilka betraktas somväxthus gaser.I ett första steg under kalibrering av parametrarna för pumpfunktionenhar en realtidskalibreringsmetod använts. Fördelen i denna processär att en detaljerad modell av systemet inte behövs för att justeradet. Sedan har övervakningsfunktionen för tankvärmaren kalibreratsgenom simuleringar. Systemets förståelse är bättre i detta fall, vilketkan hjälpa till att stämma ut det mer effektivt.Resultaten visar att båda metoderna bör säkerställa att systemet funkarbra. Däremot kunde parametrarna inte godkännas helt utan attprovas på fordon i verkliga förhållanden. Dessutom prioritet är attundvika funktionsfel av systemet, därför kanske de valda parametrarnainte är de optimala avseende prestanda. De valet av metoden börgöras enligt den ursprungliga nivån på kunskap om studieobjektet.
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"A camera calibration system". Tese, Biblioteca Digital de Teses e Dissertações da UFAL, 2007. http://bdtd.ufal.br/tde_busca/arquivo.php?codArquivo=137.
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Cheng, Shou-Yan y 鄭守延. "Camera Calibration System Research". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/06535853699349727561.
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碩士南開科技大學
電機與資訊工程研究所
98
Common calibration methods are divided into internal calibration and external calibration, in order to obtain all the camera parameters, used image distortion reduction, robotic arm applications, measuring distance and so on. The main research goal of this paper is to establish a simple camera calibration system, calibration procedure easier to use. Users often have to prepare a general calibration model calibration, waving in front of the camera, the camera calibration for the high altitude in this way is not appropriate to connect this research to establish automatic correction mechanism can simplify complex procedures, users will only The modules placed in front of the camera, the camera can be connected through the computer's internal and external parameters obtained. By calibrating the two cameras, internal and external parameters matrix can know that the camera's internal geometry and spatial relationship to the location. After the calibration parameters stored in the computer built-in database, in addition to internal and external parameters of the output matrix, the output of other correction method can also be the parameter matrix, users can easily edit using mathematical analysis software to read.
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Huang, Kuan-Chun y 黃冠鈞. "Auto-calibration multi-projectors system". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/41474719468820181487.
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碩士國立中興大學
電機工程學系所
98
The correlative applications are proposed increasingly with the improved technique of projector manufacture. The projectors can not only provide functions of flat panel display, but also create special visual effect, for instances movie theaters, 3D projection, surrounding display, projection performance, and visual reality, which are hardly implemented by flat panel displays. However, this kind of applications depends on high-level projectors. Gradually, the researches about multi-projectors system are taken seriously therefore. First, the conventional multi-projectors system are discussed in the chapter one of this study, some of them makes the projections side by side through regulating the placements of projectors; others feedback the position of projectors by using a high-resolution camera. However, these two common methods have their own advantages and defects. Hence, an Auto-Calibration Multi-projectors System aimed to the situation above is provided in this paper. When combining the projections of multi-projectors, brighter regions are usually appearing due to the overlaps of projections, and the projections are distorted by the keystone effect because of improper projector placements. Consequently, after building the system structure, to ensure the final combined projection is smooth and continuous for vision, the edge blending technique for removing the brighter regions and homography matrix in order to calibrate the distortion of projection are introduced in the chapter two. After simply understanding the two techniques, the chapter three first proposes the system flow of the Auto-Calibration Multi-projectors System and deeply expatiates on the principles and theories mentioned in chapter two. Nevertheless, the brighter region turns into darker contrarily if the original edge blending technique is applied directly to the projection overlap. Therefore, a webcam is used to observe the properties between projectors and build a corrected edge blending weighting table. On the other hand, the pre-calibrated images are obtained by utilizing modified homography matrix according to distortion of each projector fedback from the webcam. To further improve the accuracy of projection combination, a projection test pattern is adopted to enhance the relative resolution and avoid using the unideal part of webcam image. The chapter four provides experiments to prove the techniques mentioned in chapter three. The first experiment is single projection calibration which makes sure the homography matrix obtained from webcam calibrates the projection correctly; next, edge blending weighting tables are built from the properties between projectors, and then put the tables into test; the third experiment applies the result of the former two to 2×2 multi-projectors and checks the exactitude of outcomes; finally, in order to improve the convenience of the system, webcam calibration is proposed and calibrates the distortion due to improper webcam placement. The chapter five concludes each experiment and proffers solutions. Expect the achievements of this paper can implement a low-cost and simple Auto-Calibration Multi-Projectors System to advance the practicability of projectors
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Chen, Kai-ti y 陳凱迪. "Camera Calibration of Binocular System". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/51858848249963769434.
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碩士國立臺灣科技大學
電機工程系
93
Camera calibration is an necessary step in 3D computer vision in 3D metrology given 2D images. The methods include：photogrammetric calibration、self-calibration and camera calibration using vanishing points. In this thesis, we use image of absolute conic section in self-calibration combined with vanishing points to calibrate the intrinsic parameters of camera. IAC is independent of intrinsic parameters due to planar homography between the infinite plane and the image plane in camera. Three orthogonal vanishing points satisfying the conjugate property associated with a conic section at infinity can be used to construct three simultaneous linear equations with IAC. Procedures are made to solve the constraint matrix combined by the three linear equations to get IAC, and then calculate the intrinsic parameters of camera. Rotation matrix and translation matrix of which the cameras reside with respect to the world coordinate system can be calculated by using vanishing points and any two known apexes of the calibrating rectangle. In this thesis, a fast straight line extraction and recombination process will be implemented followed by vanishing points detection which will be calculated efficiently and then used for camera calibration. Keyword：camera intrinsic parameters, camera extrinsic parameters, vanishing points, fast straight line extraction, line reconstruction.
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Wu, Chung-Yu y 吳重諭. "Rotation angle of the robot arm calibration system and calibration method". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/34332939352426300141.
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碩士國立中興大學
機械工程學系所
102
The two measuring systems which aim to increase the positioning precision of robotic arms can trace robotic arm joints for its rotation angle errors. Through the correction of joints rotation angle errors and backlash angle errors to build error compensation table, it will be able to correct the operation straggling parameter of joint axle’s rotation angle. This is a huge forward to the positioning precision of robotic arms. Normally, better robotic arms have angle encoder on joint axles and this increases the price of robotic arms. With our system which prior corrects rotation angle of each axle and build error compensation table, it elevates the positioning precision without too much cost increase.
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Kung, Chung-Cheng y 龔崇誠. "Development of Ultraspectral Imaging Systems-System Planning and Calibration". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04277405949595879958.
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碩士國立屏東科技大學
生物機電工程系所
95
Because the spectral image technique simultaneously presents the spatial and spectral information of specimen, it has been widely applied to examine the quality of food and medicine. To use and develop this technology domestically, this study initiated a spectral imaging system which consisted of illuminant, lens, monochromator, and CCD camera. The evaluation on system performance including spectral calibration, resolution identification, and chromatic adjustment was conducted. Several calibrations, such as spatial adjustment, focus alignment, spectrum regression, lighting comprehension, and gray level calibration, were also discussed. The system was also compared with FOSS NIRSystem 6500 to evaluate the prediction accuracy on various glucose solutions. Results showed the system has spectral scope of 404.66~1014nm with resolution 0.29nm/pixel (△λ is 0.29nm) and each wavelength of 3.5pixel/nm. The linearity in its scope showed high R2 value of 0.9999. The system could be a useful tool for biomaterial analysis.
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Su, Wei-Chung y 蘇偉忠. "A Study of GPS Calibration System". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/40803779262914237593.
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碩士逢甲大學
土木工程所
93
With the widespread using of Global Positioning System (GPS) instrument, a need has arisen for their calibration. In this paper, some optimum methods were discussed about the establishment and use of the calibration basenet, mathematical models, analysis and discussions for observed data were included for reference in order to establish a calibration basenet for GPS instruments. The uncertainties of the calibration system are according to the “Guide to the Expression of Uncertainty in Measurement published by the international Standards Organization (ISO). The calibration capability of this calibration system is as follows: 1.Static Relative Positioning (one-dimensional) in the level of Condfidence 95%, we find the Expanded Uncertainty is 11.79mm+2.09ppm*D. 2.Static Relative Positioning (three-dimensional) in the level of Condfidence 95%, we find the Expanded Uncertainty is 15.71mm+2.79ppm*D. 3.Single Point Positioning Coordinates of the pillarsFCUA(one-dimensional / three-dimensional)in the level of Condfidence 95%, we find the Expanded Uncertainty is 34.41/47.57. 4.Single Point Positioning Coordinates of the pillarsFCUB(one-dimensional / three-dimensional)in the level of Condfidence 95%, we find the Expanded Uncertainty is 35.77/49.55.
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Lu, Yen-tsan y 呂炎燦. "Measurement, Calibration System and Competitive Capacity". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/90672384320466811203.
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碩士逢甲大學
經營管理碩士在職專班
94
Measurements are closely linked to everyone’s daily life . Data involving transactions and commerce , security and rules , science and research , as wel l as service and quality , are related to the management of measurement and calibration . For this reason , this paper starts with quality cost and uses gauge resolution (R) and product tolerance (T) as parameters for application . By using the calculation in the measurement and calibration variance model (σTotal 2 = σp2 + σm2) , we can accordingly choose suitable gauges , decide the gauge of acceptable level , set the calibration period , and reduce quality risk . This paper concludes that 2R/T can be a good choice for firms to deal with both quality and risk because R/T (Resolution – to - Tolerance) is a simpler and more effective e management approach compared to others . It can reduce the uncertainty in the process of measurement , and through tracing calibration and correcting numbers , it can effectively reduce the variance to obtain correct and valid results.
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LI, CHUN-HSIEN y 李俊賢. "Automatic Gas Sensor Calibration System Design". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/14868998369562854039.
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碩士中華大學
電機工程學系
105
Environmental sensors are the important roles in the current Internet of things applications because environmental detection is closely related to human life. Gas sensors of the environmental sensor have great development potential and market opportunities. In this thesis, semiconductor gas sensors have been used to build up the low cost digital output gas sensor module. However, the accuracy of the semiconductor gas sensor was lower than other chemical gas sensors and need to be calibrated to improve the sensor quality. This work was focused on the implementation of automatic calibration system for digital type gas sensors, including the PC terminal software programming, control master / sensor slave hardware and firmware design. The Master Board received commands from Host PC and passed to Sensor Module or received responses from Sensor Module and passed to Host PC. Finally, the Host PC builds Log reports to system manager for reviewing the calibration results. The verification results of Host commands and digital sensor protocol have been discussed in Chapter 6 and shown very good agreement with all defined specifications.
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Yui-Ann, Lo y 羅裕安. "Simulation of A Gas Flow Calibration System". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/66627342054119631801.
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碩士中原大學
化學工程研究所
86
Mathematical models of the compressible fluid transients were derived by the principles of the mass and momentum balance in this research. A simulation software which can demonstrate the dynamic behaviors of the fluid transients was then developed. Simulation studies on the fluid transients under the different operating conditions were executed using the simulation software. Simulation results show that the effects of the fluid transient on the pipeline flow may be diminished by adding the air bypass to piping system. The elapsed time of the valve closing also have the great effect on the fluid transient. The maximum increase of the pressure head during the transient is larger while the closing time is shorter. The maximum decrease of the head is larger and the response time is shorter while the opening time is shorter. For the operation of a flow calibration system, a suitable elapsed time of the valve closing or opening is worthwhile to design to eliminate the effects on the fluid transients. When the length of the piping system have the great effect on head increase for the valve closing. The temperature have less effect on the behaviors of the fluid transients . The temperature effect on the fluid transients may vary according to the characteristics of the fluids and pipeline.