ANALYSIS OF SELF-CALIBRATION ALGORITHMS IN OPTICAL ANGULAR ENCODERS
V.P. Kiryanov1, A.D. Petuhov1, A.V. Kiryanov1,2
1Institute of Automation and Electrometry, Sibirian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Keywords: goniometry, angular encoders, self-calibration algorithms, conversion error, simulation modeling
Abstract
To date, two basic types of algorithms for self-calibration of optical angular encoders have been developed in precision goniometry, differing in regular and irregular localization of the reading heads used in their structure. The analysis of the precision values of such encoders revealed the presence of special features not provided for by the theory, which stimulated the execution of experiments on modeling the expected values of such algorithms. The simulation model of optical angular encoders proposed by the authors of the article based on a two-dimensional data array makes it possible to identify the methodological error of the measurement algorithm used with sufficient accuracy for practice by determining the residual contribution of the distorting function to the final measurement error. In addition, it allows us to identify the characteristic features of calibration curves formed on the basis of methods with uniform or nonuniform localization of the reading heads. The simulation results show that self-calibration methods based on regular localization of the reading heads allow for higher measurement accuracy compared to methods based on the use of irregular localization.
|
