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Journal articles on the topic 'Calibration'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Van De Voort, Frederick R., Abdel Aziz Elkashef, and Jean-Simon Blais. "Interlaboratory Assessment of Dry Calibration Milk Powders for Calibrating Infrared Milk Analyzers." Journal of AOAC INTERNATIONAL 74, no. 5 (1991): 772–79. http://dx.doi.org/10.1093/jaoac/74.5.772.

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Abstract An interlaboratory study was carried out to assess the performance of preformulated, preanalyzed, dry calibration milk powders designed for calibrating infrared milk analyzers. The calibration powders can be reconstituted to produce consistent calibrations within laboratories. The powders met AOAC specifications In terms of accuracy and repeatability, and provide calibrations with performance characteristics comparable to those produced with conventional calibration milks. The reconstituted solutions were shown to be stable for up to 6 h at 40°C, and can be stored under refrigerated c

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Tsuchida, Satoshi, Hirokazu Yamamoto, Toru Kouyama, et al. "Radiometric Degradation Curves for the ASTER VNIR Processing Using Vicarious and Lunar Calibrations." Remote Sensing 12, no. 3 (2020): 427. http://dx.doi.org/10.3390/rs12030427.

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The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) onboard Terra platform, which was launched in 1999, has three separate subsystems: a visible and near-infrared (VNIR) radiometer, a shortwave-infrared radiometer, and a thermal-infrared radiometer. The ASTER VNIR bands have been radiometrically corrected for approximately 14 years by the sensor degradation curves estimated from the onboard calibrator according to the original calibration plan. However, this calibration by the onboard calibrator encountered a problem; specifically, it is inconsistent with the results of

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Ozdemir, Durmus, Matt Mosley, and Ron Williams. "Hybrid Calibration Models: An Alternative to Calibration Transfer." Applied Spectroscopy 52, no. 4 (1998): 599–603. http://dx.doi.org/10.1366/0003702981943932.

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A new procedure for calibrating multiple instruments is presented in which spectra from each are used simultaneously during the construction of multivariate calibration models. The application of partial least-squares (PLS) and genetic regression (GR) to the problem of generating these hybrid calibrations is presented. Spectra of ternary mixtures of methylene chloride, ethyl acetate, and methanol were collected on a dispersive and a Fourier transform spectrometer. Calibration models were generated by using differing numbers of spectra from each instrument simultaneously in the calibration and

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Zhang, Siyuan, та Linbo Xie. "Parametric ρ-Norm Scaling Calibration". Proceedings of the AAAI Conference on Artificial Intelligence 39, № 21 (2025): 22551–59. https://doi.org/10.1609/aaai.v39i21.34413.

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Output uncertainty indicates whether the probabilistic properties of the overall distribution reflect objective characteristics of the model output. Unlike most loss functions and metrics in machine learning, uncertainty pertains to individual samples, but validating it on individual samples is unfeasible. When validated collectively, it cannot fully represent individual sample properties, posing a challenge in assessing and calibrating model confidence in a limited data set. Hence, it is crucial to consider confidence calibration characteristics. To counter the adverse effects of the gradual

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Chen, Gang, Hua Chen, Yu Bo Guo, and Dong Ye. "The Comparison of Two Stereo Vision Sensor Calibration Methods." Advanced Materials Research 317-319 (August 2011): 397–400. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.397.

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This paper presents and comparison two stereo vision sensor calibration methods: Volume template based calibration method and the calibration based on virtual stereo pattern. First method use a premade volume template. Second method use a group of random spatial points that are formed by an infrared LED moved with the probe of CMM. Two methods adopt an ideal pin-hole model that ignores the nonlinear distortion of the cameras. Through compare two calibratioin methods, we can draw conclusion that the first method can be applide to stereo sensor calibration in measurement field and the second met

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Harris, Richard W., and Robert C. Chanaud. "A Simplified Method for Calibrating a Sound-Level Meter for Use With a Brüel & Kjær Artificial Mastoid." American Journal of Audiology 7, no. 2 (1998): 61–72. http://dx.doi.org/10.1044/1059-0889(1998/011).

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The standard method for calibrating a sound-level meter for use with the Brüel & Kjær Artificial Mastoid for bone vibrator tests entails the use of a signal generator, a precision voltmeter, and possibly a frequency counter. This equipment should be certified annually and traceable to the National Institute of Standards and Technology (NIST), and its use generally restricts calibration to a laboratory environment and requires a considerable amount of time. We have developed a simplified method for calibrating the sound-level meter by using a sound-level calibrator and microphone. Using th

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Peiman, Reihaneh, and Keith Clarke. "The Impact of Data Time Span on Forecast Accuracy through Calibrating the SLEUTH Urban Growth Model." International Journal of Applied Geospatial Research 5, no. 3 (2014): 21–35. http://dx.doi.org/10.4018/ijagr.2014070102.

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Does the spacing of time intervals used for model input data have an impact on the model's subsequent calibration and so projections of land use change and urban growth? This study evaluated the performance of the SLEUTH urban growth and land use change model through two independent model calibrations with different temporal extents (1972 to 2006 vs. 2000 to 2006) for the historical Italian cities of Pisa Province and their surroundings. The goal in performing two calibrations was to investigate the sensitivity of SLEUTH forecasts to longer or shorter calibration timelines, that is does calibr

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Zhang, Bao Long, Shao Jing Zhang, Wei Qi Ding, and Hui Shuang Shi. "Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves." Applied Mechanics and Materials 519-520 (February 2014): 636–39. http://dx.doi.org/10.4028/www.scientific.net/amm.519-520.636.

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The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration metho

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Meng, Fanqian, Junwu Tang, Guangyao Dai, et al. "ACDL/DQ-1 calibration algorithms – Part 1: Nighttime 532 nm polarization and the high-spectral-resolution channel." Atmospheric Measurement Techniques 18, no. 9 (2025): 2021–39. https://doi.org/10.5194/amt-18-2021-2025.

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Abstract. The Atmospheric Environment Monitoring Satellite (Daqi 1 or DQ-1) was successfully launched in April 2022, with the capability of providing continuous multi-sensor spatial and optical simultaneous observations of carbon dioxide, aerosols, and clouds. The primary payload carried on DQ-1 is an Aerosol and Carbon Detection Lidar (ACDL). The instrument comprises a high-spectral-resolution channel at 532 nm, polarization channels at 532 nm, an elastic scattering channel at 1064 nm, and an integrated-path differential absorption (IPDA) channel at 1572 nm. The optical properties of aerosols

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Senn, J. A., J. P. Mills, P. E. Miller, et al. "ON-SITE GEOMETRIC CALIBRATION OF THERMAL AND OPTICAL SENSORS FOR UAS PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2020 (August 6, 2020): 355–61. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2020-355-2020.

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Abstract. UAS imagery has become a widely used source of information in geomorphic research. When photogrammetric methods are applied to quantify geomorphic change, camera calibration is essential to ensure accuracy of the image measurements. Insufficient self-calibration based on survey data can induce systematic errors that can cause DEM deformations. The typically low geometric stability of consumer grade sensors necessitates in-situ calibration, as the reliability of a lab based calibration can be affected by transport. In this research a robust on-site workflow is proposed that allows the

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Haitjema. "Calibration of Displacement Laser Interferometer Systems for Industrial Metrology." Sensors 19, no. 19 (2019): 4100. http://dx.doi.org/10.3390/s19194100.

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Displacement laser interferometer systems are widely used for the calibration of machine tools and CMMs (Coordinate Measuring Machines). Additionally, they are often the workhorse in dimensional calibration laboratories, where they act as the basic metrological traceability link for many calibrations. This paper gives a review of the calibration of such systems, where several approaches, such as the calibrations of separate components or the system as a whole, are reviewed. The calibrations discussed are: the laser frequency, the counting system, software evaluation of the environmental condit

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Elmore, David F. "Polarization calibration techniques and scheduling for the Daniel K. Inouye Solar Telescope." Proceedings of the International Astronomical Union 10, S305 (2014): 102–7. http://dx.doi.org/10.1017/s1743921315004603.

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AbstractThe Daniel K. Inouye Solar Telescope (DKIST), formerly Advanced Technology Solar Telescope when it begins operation in 2019 will be by a significant margin Earth's largest solar research telescope. Science priorities dictate an initial suite of instruments that includes four spectro-polarimeters. Accurate polarization calibration of the individual instruments and of the telescope optics shared by those instruments is of critical importance. The telescope and instruments have been examined end-to-end for sources of polarization calibration error, allowable contributions from each of the

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Mlcek, Jiri, Lukas Dvorak, Kvetoslava Sustova, and Katarzyna Szwedziak. "Accuracy of the FT-NIR Method in Evaluating the Fat Content of Milk Using Calibration Models Developed for the Reference Methods According to Röse-Gottlieb and Gerber." Journal of AOAC INTERNATIONAL 99, no. 5 (2016): 1305–9. http://dx.doi.org/10.5740/jaoacint.16-0107.

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Abstract The study examined the effect of the choice of reference method on the functionality and reliability of calibrations in near-IR (NIR) spectroscopy intended for measuring the fat content in raw cow's milk. The fat content in the milk samples was evaluated using methods according to either Röse-Gottlieb or Gerber. The same samples were then subjected to analysis on an Antaris FT-NIR spectrometer. Using a partial least-squares algorithm, calibration models were created for both methods from the values measured. The calibration models show very good values of standard error of calibration

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Birks, John W., Andrew A. Turnipseed, Peter C. Andersen, et al. "Portable calibrator for NO based on the photolysis of N<sub>2</sub>O and a combined NO<sub>2</sub>∕NO∕O<sub>3</sub> source for field calibrations of air pollution monitors." Atmospheric Measurement Techniques 13, no. 2 (2020): 1001–18. http://dx.doi.org/10.5194/amt-13-1001-2020.

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Abstract. A highly portable calibration source of nitric oxide (NO) based on the photolysis of nitrous oxide (N2O) supplied by 8 or 16 g disposable cartridges is demonstrated to serve as an accurate and reliable transfer standard for the calibration of NO monitors in the field. The instrument provides output mixing ratios in the range 0–1000 ppb with a precision and accuracy better than the greater of 3 ppb or 3 % of the target NO mixing ratio over a wide range of environmental conditions of ambient temperature (8.5–35.0 ∘C), pressure (745–1015 mbar corresponding to 2.7–0.0 km of elevation), a

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Sanders, Kate L., and Michael S. Y. Lee. "Evaluating molecular clock calibrations using Bayesian analyses with soft and hard bounds." Biology Letters 3, no. 3 (2007): 275–79. http://dx.doi.org/10.1098/rsbl.2007.0063.

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A limiting factor in many molecular dating studies is shortage of reliable calibrations. Current methods for choosing calibrations (e.g. cross-validation) treat them as either correct or incorrect, whereas calibrations probably lie on a continuum from highly accurate to very poor. Bayesian relaxed clock analysis permits inclusion of numerous candidate calibrations as priors: provided most calibrations are reliable, the model appropriate and the data informative, the accuracy of each calibration prior can be evaluated. If a calibration is accurate, then the analysis will support the prior so th

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Ostafin, T. "Improvement of the Timing Calibration in the CMS PPS Timing Detectors." Acta Physica Polonica B Proceedings Supplement 18, no. 5 (2025): 1. https://doi.org/10.5506/aphyspolbsupp.18.5-a26.

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The Precision Proton Spectrometer is a subdetector of the CMS experiment at the LHC used for detecting forward protons. It comprises tracking and timing detectors located around 220 meters from the CMS detector, along the LHC beam pipe, on both sides. Due to their challenging operating environment, they require frequent calibration. Procedures for performing these calibrations have already been developed in LHC Run 2 (2015–2018), but in Run 3 (2022–2026), the timing detector calibration algorithm has been shown not to perform ideally for most of the data-taking runs due to data anomalies and i

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O'Reilly, Joseph E., and Philip C. J. Donoghue. "Tips and nodes are complementary not competing approaches to the calibration of molecular clocks." Biology Letters 12, no. 4 (2016): 20150975. http://dx.doi.org/10.1098/rsbl.2015.0975.

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Molecular clock methodology provides the best means of establishing evolutionary timescales, the accuracy and precision of which remain reliant on calibration, traditionally based on fossil constraints on clade (node) ages. Tip calibration has been developed to obviate undesirable aspects of node calibration, including the need for maximum age constraints that are invariably very difficult to justify. Instead, tip calibration incorporates fossil species as dated tips alongside living relatives, potentially improving the accuracy and precision of divergence time estimates. We demonstrate that t

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Ona, Egil, Valerie Mazauric, and Lars Nonboe Andersen. "Calibration methods for two scientific multibeam systems." ICES Journal of Marine Science 66, no. 6 (2009): 1326–34. http://dx.doi.org/10.1093/icesjms/fsp125.

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Abstract Ona, E., Mazauric, V., and Andersen, L. N. 2009. Calibration methods for two scientific multibeam systems. – ICES Journal of Marine Science, 66: 1326–1334. The new Simrad scientific multibeam systems, the MS70 sonar and the ME70 echosounder, each transmit over many electronically formed beams with centre frequencies spanning from 70 to 120 kHz. Calibrations of these systems are therefore more complex than for conventional split-beam echosounder systems. Two large tungsten-carbide spheres (75 and 84 mm diameter) were designed and manufactured to facilitate accurate field calibrations o

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ElNesr, Mohammad N., A. A. Alazba, and Mohammad A. El-Farrah. "Correcting Inaccurately Recorded Data due to Faulty Calibration of a Capacitance Water Content Probe." Applied and Environmental Soil Science 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/530732.

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Measuring soil water content by capacitance probes requires rigorous calibration to achieve acceptable accuracy. Some of the capacitance probes' users might take several readings using the default device calibrations or other prestored calibrations by mistake. This can lead to logging of faulty readings for periods of up to months or years. This study aimed to (1) study the importance of probe calibration and the level of error that results from using flawed calibrations and (2) to develop a mathematical method to correct the faulty recorded data. This research involved studying eleven scenari

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Andron, Teodor D., Warren T. Corns, Matthew A. Dexter, Igor Živković, Jože Kotnik, and Milena Horvat. "A Traceable Calibration for Gaseous Elemental Mercury Measurements in Air and Water." Atmosphere 16, no. 4 (2025): 421. https://doi.org/10.3390/atmos16040421.

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Calibration is crucial in quantitative analysis, ensuring the traceability of standards for an accurate comparison of results. In mercury determinations, a gas calibrator unit containing liquid mercury is used for calibration by injecting headspace volumes via syringe. The Dumarey equation has been used for over 35 years to calculate mercury headspace concentration, aligning closely with saturated vapor pressure equations. However, the 2006 Huber equation yields different values, creating discrepancies. This paper compares calibrations using the Dumarey equations against NIST 3133 certified re

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Hazen, John, and L. Scorsone. "Infrared Sensor Calibration Facility." Journal of the IEST 35, no. 1 (1992): 33–40. http://dx.doi.org/10.17764/jiet.2.35.1.d536816582691754.

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The Boeing Infrared Sensor (BIRS) Calibration Facility represents a major capital investment by The Boeing Company in optical and infrared technology. The facility was designed and built for calibrating and testing new generation large aperture long wave infrared (LWIR) sensors, seekers, and related technologies. The capability exists to perform both radiometric and goniometric calibrations of large infrared sensors under simulated environmental operating conditions. The system is presently configured for endoatmospheric calibrations with a uniform background field that can be set to simulate

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Hegeduš, Hrvoje, Marko Jurcevic, and Roman Malaric. "Internet-Enabled Calibration." International Journal of Measurement Technologies and Instrumentation Engineering 1, no. 1 (2011): 24–37. http://dx.doi.org/10.4018/ijmtie.2011010103.

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Calibration of measuring instruments provides the confidence in measurements. It is the obligation of every laboratory to have its measuring equipment calibrated in regular intervals. This obligation means that the laboratory must send its equipment to the calibration laboratory every year or two depending on the calibration intervals. During this time the equipment is not available and this presents a financial burden to the laboratory of the customer. Since many of the modern instruments include some communication interfaces, it was made possible to create an Internet-enabled calibration sys

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Foster, Katie, Rudra Pokhrel, Matthew Burkhart, and Shane Murphy. "A novel approach to calibrating a photoacoustic absorption spectrometer using polydisperse absorbing aerosol." Atmospheric Measurement Techniques 12, no. 6 (2019): 3351–63. http://dx.doi.org/10.5194/amt-12-3351-2019.

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Abstract. A new technique for calibrating photoacoustic aerosol absorption spectrometers with multiple laser passes in the acoustic cavity (multi-pass PAS) has been developed utilizing polydisperse and highly absorbing aerosol. This is the first calibration technique for multi-pass PAS instruments that utilizes particles instead of reactive gases and does not require knowledge of the exact size or refractive index of the absorbing aerosol. In this new method, highly absorbing materials are aerosolized into a polydisperse distribution and measured simultaneously with a multi-pass PAS and a cavi

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Maurits, L., M. de Heer, T. Honkola, M. Dunn, and O. Vesakoski. "Best practices in justifying calibrations for dating language families." Journal of Language Evolution 5, no. 1 (2019): 17–38. http://dx.doi.org/10.1093/jole/lzz009.

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Abstract The use of computational methods to assign absolute datings to language divergence is receiving renewed interest, as modern approaches based on Bayesian statistics offer alternatives to the discredited techniques of glottochronology. The datings provided by these new analyses depend crucially on the use of calibration, but the methodological issues surrounding calibration have received comparatively little attention. Especially, underappreciated is the extent to which traditional historical linguistic scholarship can contribute to the calibration process via loanword analysis. Aiming

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Bhatt, Rajendra, David R. Doelling, Benjamin R. Scarino, et al. "A Consistent AVHRR Visible Calibration Record Based on Multiple Methods Applicable for the NOAA Degrading Orbits. Part I: Methodology." Journal of Atmospheric and Oceanic Technology 33, no. 11 (2016): 2499–515. http://dx.doi.org/10.1175/jtech-d-16-0044.1.

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AbstractThe 35-yr NOAA Advanced Very High Resolution Radiometer (AVHRR) observation record offers an excellent opportunity to study decadal climate variability, provided that all participating AVHRR instruments are calibrated on a consistent radiometric scale. Because of the lack of onboard calibration systems, the solar imaging channels of the AVHRR must be vicariously calibrated using invariant Earth targets as a calibrated reference source. The greatest challenge in calibrating the AVHRR dataset is the orbit degradation of the NOAA satellites, which eventually drift into a terminator orbit

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Filin, Sagi, and Beáta Csathó. "Improvement of elevation accuracy for mass-balance monitoring using in-flight laser calibration." Annals of Glaciology 34 (2002): 330–34. http://dx.doi.org/10.3189/172756402781817563.

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AbstractTo exploit the high accuracy potential of laser ranging, suitable laser-altimeter calibration procedures combining laboratory and in-flight calibration steps are needed. Previous calibration schemes have limited the calibration process to flying over planar surfaces, and systematic errors remained in the system. In this paper we present a laser calibration algorithm that utilizes natural surfaces as calibration sites. This is especially important for calibrating systems in the interior of ice sheets. The proposed approach is demonstrated in calibrating the U.S. National Science Foundat

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De Champlain, Andre F., Andre-Philippe Boulais, and Andrew Dallas. "Calibrating the Medical Council of Canada’s Qualifying Examination Part I using an integrated item response theory framework: a comparison of models and designs." Journal of Educational Evaluation for Health Professions 13 (January 20, 2016): 6. http://dx.doi.org/10.3352/jeehp.2016.13.6.

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Purpose: The aim of this research was to compare different methods of calibrating multiple choice question (MCQ) and clinical decision making (CDM) components for the Medical Council of Canada’s Qualifying Examination Part I (MCCQEI) based on item response theory. Methods: Our data consisted of test results from 8,213 first time applicants to MCCQEI in spring and fall 2010 and 2011 test administrations. The data set contained several thousand multiple choice items and several hundred CDM cases. Four dichotomous calibrations were run using BILOG-MG 3.0. All 3 mixed item format (dichotomous MCQ

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C. Dias, Laisa, Alberto D. Faria, Pedro B. Costa, and Isadora L. R. Amorim. "Traceability of line scales using image processing." Acta IMEKO 14, no. 2 (2025): 1–5. https://doi.org/10.21014/actaimeko.v14i2.1972.

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Metrological traceability, is defined as the "property of a measurement result that allows the result to be related to a reference through an unbroken chain of calibrations, each contributing to the measurement uncertainty." Calibrating a line scale consists of determining the distances between the center of the marks along its length. This type of calibration is usually performed by a comparative method, where a standard scale of higher accuracy is positioned next to the scale to be calibrated, and its marks are visually compared using a graduated magnifying glass. This methodology has some p

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Gačnik, Jan, Igor Živković, Sergio Ribeiro Guevara, Radojko Jaćimović, Jože Kotnik, and Milena Horvat. "Validating an Evaporative Calibrator for Gaseous Oxidized Mercury." Sensors 21, no. 7 (2021): 2501. http://dx.doi.org/10.3390/s21072501.

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Understanding atmospheric mercury chemistry is the key for explaining the biogeochemical cycle of mercury and for improving the predictive capability of computational models. Increased efforts are being made to ensure comparable Hg speciation measurements in the air through establishing metrological traceability. While traceability for elemental mercury has been recently set, this is by no means the case for gaseous oxidized mercury (GOM). Since a calibration unit suitable for traceable GOM calibrations based on evaporation of HgCl2 solution was recently developed, the purpose of our work was

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Maliuk, A., and I. Zinchenko. "Metallicity calibrations and oxygen abundance evolution in massive galaxies." Advances in Astronomy and Space Physics 8, no. 1 (2018): 24–27. http://dx.doi.org/10.17721/2227-1481.8.24-27.

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We determined oxygen abundances for the sample of SDSS galaxies with high masses using R3D, S3D, R2D, S2D, N and O3N2 calibrations. We investigated redshift–metallicity relation for oxygen abundances obtained by each calibration. We found that for galaxies with high stellar masses oxygen abundance obtained using all calibrations is increasing on the time interval from z = 0.5 to z = 0. However, the values of oxygen abundance enrichment rate significantly depend on adopted calibration and ranges from ~0.1 dex per unit redshift for R calibration to ~0.5 dex per unit redshift for O3N2 calibration

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Jeske, T., D. McSpadden, N. Kalra, T. Britton, N. Jarvis, and D. Lawrence. "AI for Experimental Controls at Jefferson Lab." Journal of Instrumentation 17, no. 03 (2022): C03043. http://dx.doi.org/10.1088/1748-0221/17/03/c03043.

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Abstract The AI for Experimental Controls project is developing an AI system to control and calibrate detector systems located at Jefferson Laboratory. Currently, calibrations are performed offline and require significant time and attention from experts. This work would reduce the amount of data and the amount of time spent calibrating in an offline setting. The first use case involves the Central Drift Chamber (CDC) located inside the GlueX spectrometer in Hall D. We use a combination of environmental and experimental data, such as atmospheric pressure, gas temperature, and the flux of incide

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Hu, Xiaoyin, Ye Li, Haoyu Zhang, Yueling Yu, and Zhangyi Kang. "Design and Application of Automatic Calibration Device for Multi-Channel Resistance Strain Gauge Indicator." Journal of Physics: Conference Series 2113, no. 1 (2021): 012040. http://dx.doi.org/10.1088/1742-6596/2113/1/012040.

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Abstract In this paper, an automatic calibration device for multi-channel resistance strain gauge indicator is designed and its applicability and measurement accuracy are verified at laboratory. The calibration done by original resistance bridge calibrator is time-consuming for its manual operation and complex calibration process. With the intent to increase calibration efficiency, an automatic channel switch device was developed, and the resistance bridge calibrator was automated. The designed calibration device is completely computer controlled enabling a sequence of unmanned measurements. T

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Kajima, Mariko, Tsukasa Watanabe, Makoto Abe, and Toshiyuki Takatsuji. "Calibrator for 2D Grid Plate Using Imaging Coordinate Measuring Machine with Laser Interferometers." International Journal of Automation Technology 9, no. 5 (2015): 541–45. http://dx.doi.org/10.20965/ijat.2015.p0541.

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A calibrator for 2D grid plates have been developed. The calibrator was based on a commercial imaging coordinate measuring machine (imaging CMM). A laser interferometer for the calibration of the x-coordinate and two laser interferometers for the calibration of the y-coordinate were attached to the imaging CMM. By applying multistep measurement method for the calibration procedure, the geometrical error in the calibrator was reduced. The calibration of a precision 2D grid plate was demonstrated, and the expanded uncertainty was estimated to be 0.2 μm (k =2).

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Blanco, Marcelo, Jordi Coello, Hortensia Iturriaga, Santiago Maspoch, and Esther Rovira. "Wavelength Calibration Transfer between Diode Array UV-Visible Spectrophotometers." Applied Spectroscopy 49, no. 5 (1995): 593–97. http://dx.doi.org/10.1366/0003702953964084.

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The need to obtain expeditious results in control analyses of complex mixtures has turned multivariate calibration procedures into major choices for routine analyses. The inherent complexity of the calibration process and the practical need for analyses to be carried out as near the manufacturing line as possible occasionally entail calibrating with a different instrument from that subsequently employed for the analytical measurements proper. This paper exposes the problems potentially arising in transferring calibrations between diode array UV-Vis spectrophotometers. Basically, such problems

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Rosenberg, P. D., A. R. Dean, P. I. Williams, et al. "Particle sizing calibration with refractive index correction for light scattering optical particle counters and impacts upon PCASP and CDP data collected during the Fennec campaign." Atmospheric Measurement Techniques 5, no. 5 (2012): 1147–63. http://dx.doi.org/10.5194/amt-5-1147-2012.

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Abstract. Optical particle counters (OPCs) are used regularly for atmospheric research, measuring particle scattering cross sections to generate particle size distribution histograms. This manuscript presents two methods for calibrating OPCs with case studies based on a Passive Cavity Aerosol Spectrometer Probe (PCASP) and a Cloud Droplet Probe (CDP), both of which are operated on the Facility for Airborne Atmospheric Measurements BAe-146 research aircraft. A probability density function based method is provided for modification of the OPC bin boundaries when the scattering properties of measu

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Lynch, Joanna M., David M. Barbano, and J. Richard Fleming. "Evaluation of Commercially Available Milk Powders for Calibration of Mid-Infrared Analyzers." Journal of AOAC INTERNATIONAL 78, no. 5 (1995): 1219–24. http://dx.doi.org/10.1093/jaoac/78.5.1219.

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Abstract The performance of commercially available shelf-stable milk powders that upon reconstitution can be used as calibration samples for mid-infrared (IR) analyzers was evaluated. Twelve reconstituted powders and 7 raw milk samples were sent to each of 7 laboratories. Each laboratory analyzed the reconstituted powders and milk samples by IR and obtained both corrected and uncorrected data. The corrected data reflected the current calibrations (based on calibration with fresh, raw milk) of each instrument. The uncorrected data from the reconstituted powders were used to derive separate cali

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Domínguez-Niño, Jesús María, Heye Reemt Bogena, Johan Alexander Huisman, Bernd Schilling, and Jaume Casadesús. "On the Accuracy of Factory-Calibrated Low-Cost Soil Water Content Sensors." Sensors 19, no. 14 (2019): 3101. http://dx.doi.org/10.3390/s19143101.

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Soil water content (SWC) monitoring is often used to optimize agricultural irrigation. Commonly, capacitance sensors are used for this task. However, the factory calibrations have been often criticized for their limited accuracy. The aim of this paper is to test the degree of improvement of various sensor- and soil-specific calibration options compared to factory calibrations by taking the 10HS sensor as an example. To this end, a two-step sensor calibration was carried out. In the first step, the sensor response was related to dielectric permittivity using calibration in media with well-defin

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Choi, Taeyoung, Changyong Cao, Xi Shao, and Wenhui Wang. "S-NPP VIIRS Lunar Calibrations over 10 Years in Reflective Solar Bands (RSB)." Remote Sensing 14, no. 14 (2022): 3367. http://dx.doi.org/10.3390/rs14143367.

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Since 28 October 2011, the VIIRS Infrared Imaging Radiometer Suite (VIIRS) on the Suomi National Polar-orbiting Partnership (S-NPP) has operated over 10 years and successfully generated scientific global images for the Earth’s environment and climate studies. Besides thermal and day night bands, VIIRS has 14 reflective solar bands (RSBs) that cover a spectral range of 0.41 µm to 2.25 µm. The primary and daily source of calibration for the RSBs is the Solar Diffuser (SD) as an onboard calibrator, and its degradations are tracked by the Solar Diffuser Stability Monitor (SDSM). Alternatively, mon

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Byrne, Ruby, Miguel F. Morales, Bryna J. Hazelton, and Michael Wilensky. "A unified calibration framework for 21 cm cosmology." Monthly Notices of the Royal Astronomical Society 503, no. 2 (2021): 2457–77. http://dx.doi.org/10.1093/mnras/stab647.

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ABSTRACT Calibration precision is currently a limiting systematic in 21 cm cosmology experiments. While there are innumerable calibration approaches, most can be categorized as either ‘sky-based,’ relying on an extremely accurate model of astronomical foreground emission, or ‘redundant,’ requiring a precisely regular array with near-identical antenna response patterns. Both of these classes of calibration are inflexible to the realities of interferometric measurement. In practice, errors in the foreground model, antenna position offsets, and beam response inhomogeneities degrade calibration pe

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Zhao, Chao Feng, Guo Dong Li, Xiang Jin Wang, Zhi Lu Zhang, Cheng Yu Li, and Qing Bing Kong. "Design and Realization of the Calibration Equipment for Inertial Navigation System by the Control Computer." Applied Mechanics and Materials 380-384 (August 2013): 3354–57. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3354.

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Aiming at the problem of calibrating the INS in non-laboratory conditions, this thesis proposes the calibration methods by as the core and combined use of double-position directional gyro calibration, four-position horizontal gyro calibration and Schuler circuit accelerometer calibration etc. It builds up the model for scale factor calibrating, controls the inertial platform by the embedded control technique to make it the three-axis turntable state, and uses the Linux OS and C language design control software to design and develop the automatic calibration equipment for the INS. This equipmen

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Bezgachniuk, Yaroslav, Vitalii Malisevych, Mykola Kuz, and Ruslan Zapukhlyak. "Creating a calibration chain for measuring instruments using relational database." Ukrainian Metrological Journal, no. 2 (June 30, 2025): 3–7. https://doi.org/10.24027/2306-7039.2.2025.333794.

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One of the indicators of measurement quality is metrological traceability, which is represented in the form of calibration chains, that are documented sequences of calibration results from the working measuring instrument to the measurement standards with the highest accuracy. Based on conducted analysis, it is proposed to present calibration chains not linearly but as branched acyclic directed graphs. The aim of the study is to find a solution for calibration data storage and calibration chain creation for a particular measuring instrument using stored calibration data to ensure metrological

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Kim, Daeha, Il Won Jung, and Jong Ahn Chun. "A comparative assessment of rainfall–runoff modelling against regional flow duration curves for ungauged catchments." Hydrology and Earth System Sciences 21, no. 11 (2017): 5647–61. http://dx.doi.org/10.5194/hess-21-5647-2017.

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Abstract. Rainfall–runoff modelling has long been a special subject in hydrological sciences, but identifying behavioural parameters in ungauged catchments is still challenging. In this study, we comparatively evaluated the performance of the local calibration of a rainfall–runoff model against regional flow duration curves (FDCs), which is a seemingly alternative method of classical parameter regionalisation for ungauged catchments. We used a parsimonious rainfall–runoff model over 45 South Korean catchments under semi-humid climate. The calibration against regional FDCs was compared with the

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Jessen, W., S. Wilbert, B. Nouri, N. Geuder, and H. Fritz. "Calibration methods for rotating shadowband irradiometers and evaluation of calibration duration." Atmospheric Measurement Techniques Discussions 8, no. 10 (2015): 10249–82. http://dx.doi.org/10.5194/amtd-8-10249-2015.

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Abstract. Resource assessment for Concentrated Solar Power (CSP) needs accurate Direct Normal Irradiance (DNI) measurements. An option for such measurement campaigns are Rotating Shadowband Irradiometers (RSIs) with a thorough calibration. Calibration of RSIs and Si-sensors in general is complex because of the inhomogeneous spectral response of such sensors and incorporates the use of several correction functions. A calibration for a given atmospheric condition and air mass might not work well for a different condition. This paper covers procedures and requirements for two calibration methods

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Ren, Jiaxing. "Analysis of the Design and Application of a Novel CT Secondary Cable Line Calibrator." Journal of Electronic Research and Application 8, no. 2 (2024): 7–11. http://dx.doi.org/10.26689/jera.v8i2.6371.

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With the rapid development of electrical power systems, ensuring the accuracy and reliability of power transmission has become particularly crucial. The secondary cable line calibrator for current transformers (CT) plays an essential role in calibrating electrical power systems. It is not only related to the safe operation of the system but also directly impacts the accuracy of energy metering. This study aims to design and analyze an efficient CT secondary cable line calibrator to explore its application effects in the power system. By thoroughly analyzing the characteristics of CT secondary

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Garbacz, Tomasz, and Ľudmila Dulebova. "Calibration Process and Constructions of Extrusion Calibrators." Key Engineering Materials 635 (December 2014): 135–38. http://dx.doi.org/10.4028/www.scientific.net/kem.635.135.

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In the cellular extrusion process, the extrusion head gives the extrudate the desired cross-section shape and dimensions, taking into account the Barus effect and the shrinkage effect. However, if strict requirements are imposed with regard to cross-section shape and dimensions, it is necessary to fix the shape and dimensions by calibrating the extrudate obtained. The aim of this study is to present methods and constructional solutions of calibration tooling (calibrators) and to present the new calibrator that constitutes a significant element of the adapted and modernized technological extrus

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Mlačnik, Vid, and Igor Pušnik. "Influence of Atmosphere on Calibration of Radiation Thermometers." Sensors 21, no. 16 (2021): 5509. http://dx.doi.org/10.3390/s21165509.

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Current process of calibrating radiation thermometers, including thermal imagers, relies on measurement comparison with the temperature of a black body at a set distance. Over time, errors have been detected in calibrations of some radiation thermometers, which were correlated with moisture levels. In this study, effects of atmospheric air on thermal transmission were evaluated by the means of simulations using best available resources of the corresponding datasets. Sources of spectral transmissivity of air were listed, and transmissivity data was obtained from the HITRAN molecular absorption

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Schaude, Janik, and Tino Hausotte. "Uncertainty-based determination of recalibration dates." International Journal of Metrology and Quality Engineering 15 (2024): 2. http://dx.doi.org/10.1051/ijmqe/2023017.

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Traceability is of vital importance in metrology and is achieved by an unbroken chain of calibrations that relate the measurement result to a reference. Less clear is the temporal aspect of traceability, namely the determination of recalibration dates. Relevant standards require the conduction of recalibrations in a planned manner, and thus in general there is a calibration history consisting of a number of past calibrations for measurands that are part of the traceability chain. Nevertheless, commonly only the results of the last calibration of the standards of the traceability chain are cons

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Ataei, Ali, Jelle Eikhout, Ruud G. H. van Leeuwen, Esther Tanck, and Florieke Eggermont. "The effect of variations in CT scan protocol on femoral finite element failure load assessment using phantomless calibration." PLOS ONE 17, no. 3 (2022): e0265524. http://dx.doi.org/10.1371/journal.pone.0265524.

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Recently, it was shown that fracture risk assessment in patients with femoral bone metastases using Finite Element (FE) modeling can be performed using a calibration phantom or air-fat-muscle calibration and that non-patient-specific calibration was less favorable. The purpose of this study was to investigate if phantomless calibration can be used instead of phantom calibration when different CT protocols are used. Differences in effect of CT protocols on Hounsfield units (HU), calculated bone mineral density (BMD) and FE failure loads between phantom and two methods of phantomless calibration

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Xia, Dan, De Hua Li, and Sheng Yong Xu. "Efficient and Accurate Camera Calibration Based on Planar Pattern." Advanced Materials Research 204-210 (February 2011): 1258–61. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1258.

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We describe an effective method for calibrating cameras by using planar calibration patterns. The calibration pattern control points are localized by Harris detector incorporating the gradient histogram. The accuracy of the calibration control points location consequently improves the accuracy of the camera calibration. Additionally, optimization computation is carried out for increasing the accuracy of camera calibration results. Experiments using real images verified the effectiveness and robustness of the proposed method.

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Hülsen, G., J. Gröbner, A. Bais, et al. "Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA." Atmospheric Chemistry and Physics Discussions 8, no. 1 (2008): 2249–73. http://dx.doi.org/10.5194/acpd-8-2249-2008.

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Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determination

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