Chinese Optics Letters, 2008, 6 (11): 830, Published Online: Nov. 17, 2008   

Absolute small-angle measurement based on optical feedback interferometry Download: 582次

Author Affiliations
Department of Optoelectronic Engineering, Ji'nan University, Guangzhou 510632
Abstract
We present a simple but effective method for small-angle measurement based on optical feedback interferometry (or laser self-mixing interferometry). The absolute zero angle can be defined at the biggest fringe amplitude point, so this method can also achieve absolute angle measurement. In order to verify the method, we construct an angle measurement system. The Fourier-transform method is used to analysis the interference signal. Rotation angles are experimentally measured with a resolution of 10^{-6} rad and a measurement range of approximately from -0.0007 to +0.0007 rad.
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Jingang Zhong, Xianhua Zhang, Zhixiang Ju. Absolute small-angle measurement based on optical feedback interferometry[J]. Chinese Optics Letters, 2008, 6(11): 830.

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