Measurement system of tiny angle based on LED

Xiaoping Lang; Yong Lv; Lishuang Liu; Yue Niu

doi:10.1117/12.916887

15 November 2011 Measurement system of tiny angle based on LED

Xiaoping Lang, Yong Lv, Lishuang Liu, Yue Niu

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 832149 (2011) https://doi.org/10.1117/12.916887
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

Aiming at uncontrollable long-term spot shift problem, a LED system for measuring tiny angle is designed based on optical auto-collimation principle in this paper. The measuring system transforms the angle variation into the change of spot position on CCD (Charge coupled device) and locates the spot by using multiple-circle fitting method. The system is calibrated by use of photoelectrical autocollimator and actual angle variation is determined according to the calibration value. In the system, two kinds of optical source, LED (Light-emitting diode) and LD (Laser diode), are used. A contrast experiment of stability of the two light sources is carried out. Experimental results show that the proposed measuring system has small spot shift, higher stability and precision.

Citation Download Citation

Xiaoping Lang, Yong Lv, Lishuang Liu, and Yue Niu "Measurement system of tiny angle based on LED", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832149 (15 November 2011); https://doi.org/10.1117/12.916887

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