Relevant bibliographies by topics / Rotary encoder

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Rotary encoder'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Rotary encoder"

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SOMEYA, Atsushi. "Rotary Encoder." Journal of the Robotics Society of Japan 9, no. 7 (1991): 922–24. http://dx.doi.org/10.7210/jrsj.9.922.

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Miljkovic, Goran S., and Dragan B. Denic. "Redundant and Flexible Pseudorandom Optical Rotary Encoder." Elektronika ir Elektrotechnika 26, no. 6 (December 18, 2020): 10–16. http://dx.doi.org/10.5755/j01.eie.26.6.25476.

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Optical encoders are mainly used in modern motion servo systems for high-resolution and reliable position and velocity feedback. Pseudorandom optical rotary encoders are single-track and use a serial pseudorandom binary code to measure absolute position. The realization and analysis of such a rotary encoder with advanced code scanning and error detection techniques, as well as an improved redundancy in operation, are presented. A presented serial code reading solution uses two phase-shifted code tracks and two optical encoder modules. So, the realized encoder, hybrid in nature, provides “output on demand” and more or less reliable position information using very efficient error checking. Compared to a standard absolute encoder, this encoder requires a smaller code disc, facilitates installation, has greater flexibility in operation, and is less sensitive to external influences.
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WATANABE, Tsukasa. "Self-Calibratable Rotary Encoder." Journal of the Japan Society for Precision Engineering 82, no. 9 (2016): 792–96. http://dx.doi.org/10.2493/jjspe.82.792.

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Watanabe, Tsukasa, Hiroyuki Fujimoto, and Tadashi Masuda. "Self-calibratable rotary encoder." Journal of Physics: Conference Series 13 (January 1, 2005): 240–45. http://dx.doi.org/10.1088/1742-6596/13/1/056.

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Zhang, Ji-hua, and Lilong Cai. "Autofocus laser rotary encoder." Applied Optics 37, no. 13 (May 1, 1998): 2691. http://dx.doi.org/10.1364/ao.37.002691.

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Yamaguchi, Ichirou, and Tadashige Fujita. "Laser speckle rotary encoder." Applied Optics 28, no. 20 (October 15, 1989): 4401. http://dx.doi.org/10.1364/ao.28.004401.

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Cheung, Wan-Sup. "Calibration System for Angular Vibration Using Precision Rotary Encoder." Journal Of The Acoustical Society Of Korea 33, no. 1 (2014): 31. http://dx.doi.org/10.7776/ask.2014.33.1.031.

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de Buda, Eric, and Stewart deWalle. "Ultrasonic rotary shaft position encoder." Journal of the Acoustical Society of America 100, no. 4 (1996): 1938. http://dx.doi.org/10.1121/1.417861.

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Oleksenko, P. F., Yu V. Ushenin, Yu V. Kolomzarov, Yu Ya Tsirkunov, L. D. Yatsko, G. V. Brodovoj, and V. P. Ishchuk. "Optoelectronic Digital Rotary Angle Encoder." Nauka ta innovacii 3, no. 6 (December 25, 2007): 4–12. http://dx.doi.org/10.15407/scin3.06.004.

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Jia, Hua-Kun, Lian-Dong Yu, Yi-Zhou Jiang, Hui-Ning Zhao, and Jia-Ming Cao. "Compensation of Rotary Encoders Using Fourier Expansion-Back Propagation Neural Network Optimized by Genetic Algorithm." Sensors 20, no. 9 (May 3, 2020): 2603. http://dx.doi.org/10.3390/s20092603.

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The measurement accuracy of the precision instruments that contain rotation joints is influenced significantly by the rotary encoders that are installed in the rotation joints. Apart from the imperfect manufacturing and installation of the rotary encoder, the variations of ambient temperature could cause the angle measurement error of the rotary encoder. According to the characteristics of the 2 π periodicity of the angle measurement at the stationary temperature and the complexity of the effects of ambient temperature changes, the method based on the Fourier expansion-back propagation (BP) neural network optimized by genetic algorithm (FE-GABPNN) is proposed to improve the angle measurement accuracy of the rotary encoder. The proposed method, which innovatively integrates the characteristics of Fourier expansion, the BP neural network and genetic algorithm, has good fitting performance. The rotary encoder that is installed in the rotation joint of the articulated coordinate measuring machine (ACMM) is calibrated by using an autocollimator and a regular optical polygon at ambient temperature ranging from 10 to 40 °C. The contrastive analysis is carried out. The experimental results show that the angle measurement errors decrease remarkably, from 110.2″ to 2.7″ after compensation. The mean root mean square error (RMSE) of the residual errors is 0.85″.
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Dissertations / Theses on the topic "Rotary encoder"

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Amin-Shahidi, Darya. "Ultra-precise on-axis encoder self-calibration for fast rotary platforms." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/7573.

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This thesis presents the design, implementation, and experimental testing of a rotary platform and its use for encoder calibration research. So far, the experimental results have demonstrated a calibration repeatability of better than 200 nano-radians (0.04 arc-second), which is much better than the state of the art precision angular encoder error of about 1 arc-second. The major contributions of this thesis include achieving ultra-accurate encoder calibration results as well as the design of an ultra-precise rotary table and a set of high-speed electronics. Others have developed many encoder calibration techniques. This thesis aims to identify, improve, and experimentally demonstrate the accuracy limit of an encoder self-calibration method developed at UBC. The work can be categorized into the following three parts: 1) Ultra Precise Rotary Platform Design, Manufacturing, and Assembly: A precision rotary platform was designed for encoder calibration and other spindle metrology research. The rotary platform uses a precision airbearing. Two different rotary encoders are included for rotation measurement. Three displacement probes monitor the motion of a target ball to identify and compensate for rotor vibrations. The platform is driven by an ultra-low cogging torque motor for minimum velocity ripple. The setup’s versatility makes it an excellent spindle metrology research tool. 2) High-Speed Electronics for Signal Processing: Fast processing is required for encoder calibration and precise stage control. Since no commercial controller met our fast signal detection and processing requirements, a set of electronics was designed: an FPGA-based high-speed digital controller (Avalanche) and a precision analog processing board (NanoRAD). Avalanche incorporates a fast-Virtex4 FPGA chip, a novel 1.2-GHz timer, five fast ADCs, four fast DACs, Gigabit Ethernet, High-Speed USB, and DDR RAM. NanoRAD incorporates fast comparators and precision buffers for analog processing and filtering. 3) Self-Calibration Algorithm Development and Experiments: After integration of the electronics with the mechanical assembly, the encoder calibration technique was examined. The method was adapted for the new setup, the damping estimation portion of the algorithm was improved, and the whole method was tested experimentally and in simulation. The encoder accuracy has been experimentally enhanced by 25-times from 5,000 (1 arc-second) to 200 (0.04 arc-second) nano-radians.
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Watkins, Adam James. "A new approach to rotary 2D metrology using an IME (incremental motion encoder)." Thesis, Nottingham Trent University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430260.

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Machines, such as gantry robots, CNC or milling machines, must be able to perform consistently over time, and any degradation in performance due to changes in speed, age or mechanical failure must be detected or predicted as early as possible. Ultimately these changes lead to positioning errors and vibrations within the machine. To maintain accuracy the machines may checked 'on-site' or they may be 'mapped' in terms of desired and actual tool-tip position. These maps can then be integrated into the controlling software or hardware to improve performance. Monitoring the machines can form part of a feedback control loop. In order to carry out machine monitoring a number of devices are available. These include interferometers, ballbars, grid encoders and accelerometers for measuring vibration levels. None of these techniques forms a complete metrology solution. Some have limited coverage of the machine bed, others are too fragile to use on a working machine, and some do not provide the level of detail required to carry out a proper assessment of the machine. Initial investigations showed that vibrations are a key parameter to be monitored when making an accurate measurement of machine performance. Vibrations can reveal wear in components indicating imminent breakdown and they can themselves cause damage to the machine. Vibrations are commonly caused by rotating mechanical components. Patented in 1992, and developed within the Intelligent Machines Group, the Incremental Motion Encoder (IME) is a novel means of monitoring the motion of rotating shafts. The IME is a development of the angular encoder which uses 3 or more read heads. One read head allows the measurement of angular change. The use of multiple read heads allows it to detect lateral, as well as angular, changes in position. It is capable of measuring the submicrometre vibrations in rotating shafts over a wide bandwidth. By attaching an IME to the end effector of a machine it is possible to monitor the complete range of vibrations that occur at the end effector. A novel metrology technique, based on the attachment of the IME to the machine head, has been developed. This technique complements the measurement of vibrations with the remote monitoring of machine position. Laser triangulation is used to constantly track the position of the IME as it moves with the machine. The angles required to perform the triangulation are measured by using a laser that rotates with the IME. The laser beam strikes photosites at the periphery of the machine's range of motion allowing their angular position to be recorded by the rotating IME. The new technique has been developed and a test rig scanning unit has been constructed for evaluation. The test rig's construction allows for the measurement of angles against background torsion al vibrations. Lateral vibrations were prevented from occurring. Results from the test rig scanning unit indicate that the IME can be used for the measurement of angles of the order of 0.006 radians, which can then used for the triangulation of the scanner's position. Small changes in the position of the scanner (O.lmm) can also be detected making the technique suitable for the tracking of crude machine position. Further, investigations have involved the addition of an external torsional vibration source to the scanning unit and it has been shown that they distort the angular measurements. Algorithms based on filtering have been developed to use the IME data to compensate for such distortions. The algorithms have been evaluated using known angular changes and show a considerable reduction in the angular errors due to vibrations (a five-fold decrease in standard deviation from just under 0.0006 radians to 0.0001 radians).
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Šindelář, Michal. "Kalibrace snímačů úhlu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316384.

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This master’s thesis deals with calibration of incremental encoders. Introduces basic principles and terms in the field of rotary encoders and its calibration. The first part describes angular displacement sensors. Especially it focuses on optoelectrical incremental encoders. It also includes market research of very high-accuracy encoders. The second part contains description of precision calibration techniques with uncertainty to the thousandth of an arc-sec level. In the last part, the development of a calibration stage is presented and consequently the error map of an encoder is obtained.
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Hatiris, Emmanouil. "Calibration and error definition for rotary motion instrumentation using an incremental motion encoder (IME)." Thesis, Nottingham Trent University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369257.

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Condition based monitoring is widely used for the determination of the health of machines. The Nottingham Trent University Computing Department has developed a new system, the Incremental Motion Encoder (!ME), which is based on the time interpolation of the digital signals produced by an optical encoder. Experiments have shown that the !ME can be used as a condition based maintenance sensor as it is possible to detect rolling element defects, an unbalanced shaft and oil contamination of a bearing. The system uses a geometrically configured optical device to scan a precision encoder disc and Digital Signal Processing technology is used to interpret the signals. Previous work has demonstrated the qualitative usefulness of the 1ME. However, further work was needed to assess the accuracy of the measurements, to analyse the principles of the 1ME, to validate the performance of the existing device and to develop methods for error definition and error compensation. Testing and experimentation on the existing experimental system have been carried out by the Candidate and an understanding gained of the device. The sources of error of the 1ME have been identified, which had not been quantified previously. Measuring and compensating for the three main sources of error, read head position, eccentricity of the encoder disc and encoder abnormalities are the three major tasks of the project. Modifications to the experimental rig have been developed in order to allow these tasks to be addressed. The Candidate has developed three different types of techniques to measure the position error of the read heads. A pattern recognition method was developed and is successful for 1ME systems that use an encoder disc with significant grating line errors. A second method using Fast Fourier Transform (FFT) has been developed to exploit the fact that the difference in the phase angles, obtained using a FFT, gives the angle between the read head positions. The new experimental system is now able to obtain the angular position of the read heads by using the index grating line. The third method relies on the presence of the index grating line on the encoder disc which may not be present in all systems. Eccentricity of disc centre relative to the centre of rotation affects the correct calculation of the angular position of the encoder disc. Algorithms have been developed by the Candidate in order to compensate for this type of error. Experimental results have shown that angular position error can be corrected successfully. The Candidate has developed methods for detection of small abnormalities of the encoder disc by using a multiple averaging technique. Computational algorithms have been developed to correct the encoder disc abnormalities by using individual information from each read head, promising results have been obtained from the experimental 1ME. An 1ME device can be tailored to fulfil the desired requirements of resolution, bandwidth and accuracy. A self calibration instrument can be developed by using the previously mentioned techniques in order to self calibrate and increase the accuracy and reliability of an IME's results.
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Åhs, Karl-Johan. "Framtagande av ny höjdmätningsmetod till försvarets antennhiss 861." Thesis, Uppsala universitet, Nanoteknologi och funktionella material, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176438.

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This bachelor degree project was carried out at Saab AB Service and Repair, Arboga, Sweden. The objective was to design, construct and implement a new stable and reliable method of measuring the continuous vertical displacement (height) of the military search radar PS861 mounted on a hydraulic powered elevator. The end product needs to be durable enough to be fully operational in the harsh environment of an outdoor elevator shaft and yet as accurate and precise as possible since one of its purposes is to calibrate control equipment. Previously used technique has proven not to meet any of the above mentioned properties. A prototype using a high resolution quadrature output rotary encoder has been developed, allowing a completely digital interface. This new method has been evaluated in laboratory environment where tests have been conducted regarding both reliability and validity. The tests show that the new digital system provides highly improved accuracy and precision and in addition to that, the sensor with its IP-64 classification ensures operation even in the worst conditions. The technology developed in this project is also versatile and may be used in other situations where rotational motions are to be measured. Real life tests have not yet been carried out, but future test results will determine whether the product will replace the old system or not.
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Gilbert, Alexander Prodromos. "Design and implementation of a magnetic rotary wheel encoder for a self-driving robotic vehicle." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98964.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 25).
This thesis project aims to help complete the fabrication of a magnetic wheel encoder for a fleet of autonomous electric vehicles that will provide shuttle service across MIT's campus. Currently no self-driving vehicles exist for such a function, especially for mobility on a college campus. In an effort to assist the system's simultaneous localization and mapping (SLAM) algorithm, this magnetic wheel encoder was designed and implemented to more accurately and directly determine the vehicle's trajectory. After mounting the magnets and sensors, an algorithm was developed to map the vehicle's path given raw magnetic field data. Though the open-loop system was not a perfect map to the actual path taken, this work provides a guideline with more than enough accuracy for the SLAM algorithm.
by Alexander Prodromos Gilbert.
S.B.
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Johansson, Jonas, and Daniel Petersson. "Torque Sensor Free Power Assisted Wheelchair." Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-656.

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A power assisted wheelchair combines human power, which is delivered by the arms through the pushrims, with electrical motors, which are powered by a battery. Today’s electric power assisted wheelchairs use force sensors to measure the torque exerted on the pushrims by the user. The force sensors in the pushrims are rather expensive and this approach also makes the wheels a little bit clumsy. The objective with this project is to find a new, better and cheaper solution that does not use expensive force sensors in the pushrims. The new power assisted wheelchair will instead only rely on its velocity, which is measured with rotational encoders, as feedback signal and thereby the project name “Torque Sensor Free Power Assisted Wheelchair”.

The project consisted of two main parts; an extensive construction part, where an ordinary joystick controlled motorized wheelchair has been rebuild to the new power assisted wheelchair without torque sensors and a development part, where different torque sensor free controllers has been designed, simulated, programmed and tested.

The project resulted in a torque sensor free power assisted wheelchair, where the final implemented design is a proportional derivative controller, which gives a very good assisting system that is robust and insensitive to measurement noise. The proportional derivative control design gives two adjustable parameters, which can be tuned to fit a certain user; one parameter is used to adjust the amplification of the user’s force and the other one is used to change the lasting time of the propulsion influence.

Since the new assisting control system only relies on the velocity, the torque sensor free power assisted wheelchair will besides giving the user assisting power also give an assistant, which pushes the wheelchair, additional power. This is a big advantage compared to the pushrim activated one, where this benefit for the assistant is not possible.

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Kokeš, Ondřej. "Zařízení pro ovládání mikroposuvu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218681.

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Presented thesis analyses a function of the particular type of the nanopositioner with aim to suggest and construct an electronic device suitable for control of the nanopositioner slider. In presented material there is a description of the control signals and possibility of their generating in the respect of slider movement accuracy. The main goal of the thesis is to describe electronic units ranging from power supply, control processor unit part to end part that directly joint nanopositioner. There is also programme equipment for microcontroller and computer, communication description, movement measuring and calibration and draft for the close-up of the control loop for additional increase of the movement accuracy.
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Priškin, Jiří. "Vysokofrekvenční obvodový analyzátor s DDS." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218400.

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At first this thesis is dealing with the basic principles of network analyzers and afterwards goes to propose conception of a polyscope, as a special type of the scalar network analyzer, designed for magnitude frequency response measurement of two-port devices. As a result of this part of the thesis is the polyscope's block circuit diagram and also selection of key integrated circuits for sweep generator, logarithmic detector and control circuits. As the following part of the thesis is a design of the all basic analyzer's circuits resulting in their schematics diagrams and printed circuit boards, do assembly of all modules and mechanical construction of the instrument and look of the front panel. Some of the tasks is implementation of the firmware and personal computer application able to download measured data from the circuit analyzer via USB and generate chart in Microsoft Office Excel book.
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Graetz, Richard J. "On-axis self-calibration of angle measurement errors in precision rotary encoders." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/32118.

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Incremental angle encoders are widely used in industry as a standard sensor to measure rotational axis angular position and velocity. The best commercially available angle encoders have achieved measurement accuracy on the order of 1 arc-sec with proper installation. Higher-accuracy encoders are needed to measure rotational axis angular position and velocity in ultra-precision rotary table based manufacturing and measurement applications. One specific application is to enable the development of maskless lithography technology used for mass manufacture of next generation semiconductors. In order to achieve accuracy well below 1 arc-sec, repeatable errors in the encoder measurement need to be removed through a calibration process. Numerous high-accuracy encoder calibration techniques have been developed, but the fundamental problem of calibrating angle encoders remains unsolved; their calibration results cannot be directly applied to the manufacturing machine. Existing calibration methods involve calibrating the encoder on a specially designed angle comparator, but the calibrated error is useless after transferring the encoder back to its application axis, due to the sensitivity of error on the installation. Other calibration methods capable of calibrating the encoder on its application axis cannot determine all the encoder error harmonics. There still does not exist a calibration method to quickly calibrate an angle encoder on its application axis, providing all encoder error harmonics. In this thesis the development of a Time-measurement Dynamic Reversal (TDR) encoder calibration technique is presented and its accuracy is validated, through simulation and experiment, and shown to improve encoder accuracy to the thousandth of an arc-sec level. The accuracy of this method is analyzed in detail, and an accuracy limitation based purely on measurement repeatability identified. Through experiments performed on a custom-built precision rotary table, experimental accuracy of several thousandths of an arc-sec is validated through uncertainty analysis and spindle radial error motion comparison. A comparison with the industry standard, the Equal Division Averaged (EDA) calibration method, shows agreement within 0.01 arc-sec for error harmonics not multiple of four. Due to the missing multiple of four harmonics, the EDA method is found to be 0.3 arc-sec less accurate than the TDR method in calibrating this experimental setup.
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Book chapters on the topic "Rotary encoder"

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Cameron, Neil. "Rotary Encoder." In Arduino Applied, 177–87. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3960-5_9.

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Cameron, Neil. "Rotary encoder control." In Electronics Projects with the ESP8266 and ESP32, 559–84. Berkeley, CA: Apress, 2020. http://dx.doi.org/10.1007/978-1-4842-6336-5_19.

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Wang, Shuang, Jie Jin, Tiecai Li, and Guoying Liu. "High-Accuracy Magnetic Rotary Encoder." In Communications in Computer and Information Science, 74–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34381-0_9.

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Gay, Warren. "Rotary Encoders." In Custom Raspberry Pi Interfaces, 103–27. Berkeley, CA: Apress, 2017. http://dx.doi.org/10.1007/978-1-4842-2406-9_8.

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Martín, Ferran, Cristian Herrojo, Javier Mata-Contreras, and Ferran Paredes. "Microwave Rotary Encoders." In Time-Domain Signature Barcodes for Chipless-RFID and Sensing Applications, 105–34. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39726-5_4.

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Asfia, Ali, and Jafar Rezaei. "A High Accuracy Method for Rapid Measurement of Resulted Code Pattern Radial Runout of Rotary Optical Encoder Disc." In Communications in Computer and Information Science, 36–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-26010-0_5.

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Gregori, Stefano, Roberto Rossi, Guido Torelli, and Valentino Liberali. "Generation of Optimal Unit Distance Codes for Rotary Encoders through Simulated Evolution." In Lecture Notes in Computer Science, 100–109. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45365-2_11.

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Unsacar, F. "Adapter and driver design for rotary encoders." In Research Notes in Mathematics Series. Chapman and Hall/CRC, 2000. http://dx.doi.org/10.1201/9781420036039.ch54.

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Unsacar, F. "Adapter and driver design for rotary encoders." In Integral methods in science and engineering, 322–26. Chapman and Hall/CRC, 2019. http://dx.doi.org/10.1201/9780429123634-54.

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Tanaka, E., K. Nakajima, Y. Kojima, K. Okabe, H. Takebe, K. Nagamura, K. Ikejo, and R. Nemoto. "Easy set-up and in situ automatic gear diagnostic system using laser beam reflection (development of a new method enables to remove effects of the rotational fluctuation instead of a rotary encoder)." In International Gear Conference 2014: 26th–28th August 2014, Lyon, 1110–19. Elsevier, 2014. http://dx.doi.org/10.1533/9781782421955.1110.

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Conference papers on the topic "Rotary encoder"

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Xiong, Shaomin, Yuan Wang, Xiang Zhang, and David Bogy. "A Magnetic Rotary Encoder for Patterned Media Lithography." In ASME 2014 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/isps2014-6910.

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Bit patterned media (BPM) is expected to enable the magnetic storage density in hard disk drives (HDDs) beyond 1 Tb/in2. BPM uses isolated magnetic islands to record the data information. However, the large volume fabrication of those patterned media disks at an affordable cost is a challenge for this new technology. A master template is the first step for patterned media fabrication. Using nano-imprint technology, the master template can be replicated to tens of thousands of pattern disks. A rotary electron beam lithography machine or plasmonic nanolithography machine is recommended to assist in the fabrication of the master template. In both systems, a high resolution encoder system for positioning in the rotary lithography machine is necessary. In this paper, a magnetic rotary encoder system is introduced. The encoder system can be operated at several thousand revolution per minute (RPM). The scale pitch is 90 nm which is one to two orders smaller than current optical encoders. The resolution is about 2.8 million counts per revolution (CPR). A flying magnetic head is used to retrieve the readback signal from the magnetic encoders. A field programmable gate array (FPGA) is implemented to finish the high speed signal processing and provide a digital format encoder signal to trigger the lithography machine at a rate of several Mega Hertz.
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Ng, Kim-Gau, and Joey K. Parker. "A Two-Encoder Finger Position Sensing System for a Two-Degree-of-Freedom Robot Hand." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0171.

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Abstract As part of a robot hand with two independently controlled fingers each having one degree of freedom, a novel two-encoder position sensing system was designed for each of the fingers. In this system, a combination of a linear encoder and a rotary encoder is used to indicate finger position. The linear encoder provides coarse measurements while the rotary encoder provides fine measurements between two adjacent linear encoder counts. This two-encoder system permits more precise measurements than a system with only the linear encoder. The two encoders are connected to an IBM PC through an interface system. This paper presents the complete design and implementation of this two-encoder position sensing system.
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Campbell, P. "Magnetoresistive sensors for rotary position encoder." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734530.

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Peng, Kai-Yang, and Jen-Yuan (James) Chang. "Development of Novel Rotary Magnetic Encoder." In ASME 2019 28th Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/isps2019-7502.

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Abstract This paper discussed the development and validation of a new rotary magnetic encoder for measurement of spindle’s axial displacements. The novelty of this work is on the design of permanent magnets as the magnetizing source to produce alternative magnetic polarities on ferromagnetic material electroplated on disk/ring-like flange that is attached to the targeted spindle shaft. Through mechatronics integration and numerical finite element parameter studies, the optimal combination of the magnetizer design parameters with consideration of the arrangement of magnetoresistive (MR) elements is reached to produce the novel encoding magnetic patterns for the axial displacement measurements. The effectiveness of the proposed method is further validated through calibrated experiments leading to the conclusion of reaching 10um accuracy performance in the measurement of the spindle’s axial elongation.
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Ye, Zunzhong, and Yibin Ying. "A multifunctional rotary photoelectric encoder management system." In Optics East 2005, edited by Bhaskaran Gopalakrishnan. SPIE, 2005. http://dx.doi.org/10.1117/12.630757.

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Wang, Ting-Feng, Yung-Jhe Yan, Hou-Chi Chiang, Tsan Lin Chen, and Mang Ou-Yang. "Coding optimization for the absolute optical rotary encoder." In 2018 International Automatic Control Conference (CACS). IEEE, 2018. http://dx.doi.org/10.1109/cacs.2018.8606741.

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Garmabdari, Rasoul, Suhaidi Shafie, Maryam Mohd Isa, and Alireza Garmabdari. "Measurement technique for bidirectional four sensor rotary encoder." In 2013 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA). IEEE, 2013. http://dx.doi.org/10.1109/icsima.2013.6717940.

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Zhou, Liang, Wen-ji She, and Jing Huang. "Error correction of photoelectric rotary and angle encoder." In Selected Proceedings of the Photoelectronic Technology Committee Conferences held July-December 2013, edited by Jorge Ojeda-Castaneda, Shensheng Han, Ping Jia, Jiancheng Fang, Dianyuan Fan, Liejia Qian, Yuqiu Gu, and Xueqing Yan. SPIE, 2014. http://dx.doi.org/10.1117/12.2054092.

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Vervaeke, K. "C10.2 Rotary Encoder Magnet Inspection with Noise Elimination." In SMSI 2021. AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf, Germany, 2021. http://dx.doi.org/10.5162/smsi2021/c10.2.

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Zheng, Dezhi, Shaobo Zhang, Yuming Zhang, and Chen Fan. "Application of CORDIC in capacitive rotary encoder signal demodulation." In 2012 8th IEEE International Symposium on Instrumentation and Control Technology (ISICT). IEEE, 2012. http://dx.doi.org/10.1109/isict.2012.6291638.

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