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27 July 2021 Calibration of rotary encoders with different interfaces by means of a dynamic goniometer
Petr A. Pavlov, Yuri V. Filatov, Irina B. Zhuravleva
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Optical Engineering, 60(7), 074105 (2021). https://doi.org/10.1117/1.OE.60.7.074105
Abstract
Rotary optical encoders are widely used in all areas of industry, robotics, and special equipment. The accurate measurement of their characteristics is a necessary task for their successful implementation. We attempt to find a unified approach to determining the accuracy of rotary encoders. The proposed approach is based on statistics and code reliability, which characterizes the probability that the measured code corresponds to the specified code. To determine the code reliability, one has to measure the turn angle with a goniometric device and compare the measured values with the encoder codes. The paper considers the dynamic goniometer for determining the error of absolute angle encoders, which allows for highly accurate measurements in a wide range of rotation rates. The measurement is made at certain moments of time, depending on the electrical interface of the encoder. In the case of a parallel interface, the time points are determined by the moment when the encoder code changes. This data collection allows for obtaining a general population. In the case of an encoder, with the sequential approach to reading the code, it is not possible to obtain the general population in a wide range of rotation rates. We analyze the above-mentioned case in detail and present experimental data obtained with a dynamic goniometer and the results of code reliability calculations.
© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2021/$28.00 © 2021 SPIE
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Petr A. Pavlov, Yuri V. Filatov, and Irina B. Zhuravleva "Calibration of rotary encoders with different interfaces by means of a dynamic goniometer," Optical Engineering 60(7), 074105 (27 July 2021). https://doi.org/10.1117/1.OE.60.7.074105
Received: 15 March 2021; Accepted: 13 July 2021; Published: 27 July 2021
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KEYWORDS
Computer programming
Interfaces
Calibration
Reliability
Metrology
Optical engineering
Clocks
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