High-precision laser interferometer for measuring small angles

Guijun Ji; Guoxiong Zhang; Xiaotang Hu

doi:10.1117/12.22183

1 July 1990 High-precision laser interferometer for measuring small angles

Guijun Ji, Guoxiong Zhang, Xiaotang Hu

Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22183
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany

Abstract

In this paper a laser interferoeter for measuring small angles with an accuracy better than 0. 01 arcsecond is proposed. 1 THEORY The diagram of the interferometer is shown in Fig. 1. When the angle 1--laser 2--beam-expanding lens 3--pin--hole filter 4--collimating lens 5--aperture 6-- beam-splitter 7-CCD component 8--detector for stabilizing laser Mirrors A B--measuring reflectors Mreference mirror composed by mirrors A B is equal to X/(2m1) m1 . . the mirrorimages of Fig. 1 mirrors A B are in the same plane equal spacings on both sides of the visual field will be formed. When A rotates about 0 a small angle 4 the mirrorimages A B are not same plane and fringe spacings on two sides of the visual field be unequal. Plus sign is taken when mirror A rotates clockwisely sign for counterclockwise rotation. We have 4A(1/e 1/ca )/(4m2) (1) where e e1 are shown in Fig. 1. In order to get adequate interferometric field keep fringe straight enhance the contrast of the fringe and keep the contrast constant the lengths of mirrors A B should be long enough R:T ratio of splitter should be determined according to how many times the incident beam being reflected between mirrors A B and the reflective index of mirrors A B and the interferometer should satisfy the equivalent sine condition/''- Definite Fourie Transfer mode of processing interferometric fringe is adopted in this

Citation Download Citation

Guijun Ji, Guoxiong Zhang, and Xiaotang Hu "High-precision laser interferometer for measuring small angles", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22183

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