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Proceedings Paper

Measurement system of tiny angle based on LED
Author(s): Xiaoping Lang; Yong Lv; Lishuang Liu; Yue Niu
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Paper 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.

Paper Details

Date Published: 16 November 2011
PDF: 7 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832149 (16 November 2011); doi: 10.1117/12.916887
Show Author Affiliations
Xiaoping Lang, Beijing Information Science and Technology Univ. (China)
Yong Lv, Beijing Information Science and Technology Univ. (China)
Lishuang Liu, Beijing Information Science and Technology Univ. (China)
Yue Niu, Beijing Information Science and Technology Univ. (China)


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)

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