Aiming to improve the measurement accuracy of angular displacement sensor effectively and greatly reduce the production costs under an ordinary machining accuracy. A new method of error correction called harmonic calibration based on the closure property of circle was presented. Using this method, real-time and dynamic error separation and correction can be realized when error curve of angular displacement sensor is uncertain. In addition, a method of “spatial sampling” is presented to solve the problem of asynchrony for dynamic sampling. Furthermore, another method which adopts software assist to accomplish adaptive filter is presented to eliminate the influence of random error in the dynamic measurement. As a result a system of full-automatic real-time detection and dynamic calibration for angular displacement sensor with intelligent functions was developed. Experiment results prove that the accuracy of time grating can reach up to ±1” in this way. This effective dynamic method can provide a qualitative and quantitative analysis for calibration of angular displacement sensor.

Date Published: 15 November 2011
PDF: 7 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832123 (15 November 2011); doi: 10.1117/12.904929

Published in SPIE Proceedings Vol. 8321:
Seventh International Symposium on Precision Engineering Measurements and Instrumentation
Kuang-Chao Fan; Man Song; Rong-Sheng Lu, Editor(s)