Small roll angle measurement based on auto-collimation and moiré fringe

Xu-guang Bai; Sheng Cai; Ming Dai

doi:10.1117/12.837317

20 November 2009 Small roll angle measurement based on auto-collimation and moiré fringe

Xu-guang Bai, Sheng Cai, Ming Dai

Proceedings Volume 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems; 75110Z (2009) https://doi.org/10.1117/12.837317
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

A novel method for small roll angle measurement based on auto-collimation and moiré fringe is presented. A right-angle prism is used as an indicator of small roll angle around the optical axis, and a CCD is used to collect moiré fringes that are generated by scale grating image which is reflected by prism and index grating. Any small roll angle of the prism will change the include angle of the grating pair and meanwhile induce a change in the moiré fringe period. The relationship between roll angle and period of moiré fringes is established. The period data is obtained by image processing. The experimental result certifies that the principle of small angle measurement method based on auto-collimation and moiré fringe is correct and feasible. The measuring error is smaller than 0.2" within 7' range compared with 0.2" autocollimator.

Citation Download Citation

Xu-guang Bai, Sheng Cai, and Ming Dai "Small roll angle measurement based on auto-collimation and moiré fringe", Proc. SPIE 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 75110Z (20 November 2009); https://doi.org/10.1117/12.837317

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