Measurement of angle of rotation using circular optical grating

Huai Min Shang; Siew-Lok Toh; Yu Fu; Chenggen Quan; Cho Jui Tay

doi:10.1117/12.429549

13 June 2001 Measurement of angle of rotation using circular optical grating

Huai Min Shang, Siew-Lok Toh, Yu Fu, Chenggen Quan, Cho Jui Tay

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429549
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

In this paper, a simple method is described for the measurement of small angles of rotation of a flat surface using a circular optical grating, which may be generated and projected onto the test surface using either a standard Michelson interferometer or a computer-controlled LCD projector. In view of its availability in most laboratories, a Michelson interferometer is used in this paper. The diameter of the grating that is generated can be easily magnified or be reduced to suit the size of the test surface. With circular grating, the angular rotation of both diffuse and specularly reflective surface about any axis of rotation can be measured from the distortion of the grating. The distorted grating that is diffracted from a specularly reflective surface may be recorded in two different ways using a CCD camera. In the first method, the distorted grating is recorded off the m mirror surface as though it were a diffuse surface. In the second method, the distorted grating is recorded off the miro surface as though it were a diffuse surface. In the second method, the distorted grating is specularly reflected onto an opaque screen and the CCD camera subsequently records the grating image off this screen.

Citation Download Citation

Huai Min Shang, Siew-Lok Toh, Yu Fu, Chenggen Quan, and Cho Jui Tay "Measurement of angle of rotation using circular optical grating", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429549

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