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Proceedings Paper

Small roll angle measurement based on auto-collimation and moiré fringe
Author(s): Xu-guang Bai; Sheng Cai; Ming Dai
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Paper 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.

Paper Details

Date Published: 20 November 2009
PDF: 8 pages
Proc. SPIE 7511, 2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems, 75110Z (20 November 2009); doi: 10.1117/12.837317
Show Author Affiliations
Xu-guang Bai, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate School of the CAS (China)
Sheng Cai, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Graduate School of the CAS (China)
Ming Dai, Graduate School of the CAS (China)


Published in SPIE Proceedings Vol. 7511:
2009 International Conference on Optical Instruments and Technology: Optoelectronic Measurement Technology and Systems
Shenghua Ye; Guangjun Zhang; Jun Ni, Editor(s)

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