Displacement meter with ferroelectric liquid crystal spatial light modulator utilizing speckle photography

Yuji Kobayashi; Tamiki Takemori; Naohisa Mukohzaka; Narihiro Yoshida; Terushige Hori; Seiji Fukushima

doi:10.1117/12.132167

20 October 1992 Displacement meter with ferroelectric liquid crystal spatial light modulator utilizing speckle photography

Yuji Kobayashi, Tamiki Takemori, Naohisa Mukohzaka, Narihiro Yoshida, Terushige Hori, Seiji Fukushima

Author Affiliations +

Proceedings Volume 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation; (1992) https://doi.org/10.1117/12.132167
Event: International Symposium on Optical Fabrication, Testing, and Surface Evaluation, 1992, Tokyo, Japan

Abstract

A speckle photographic technique was employed for the measurement of displacement of diffuse objects. In this method a double exposure is made on an FLC-SLM and the speckle correlation is detected with a position-sensitive detector. Use of this system means easy successive detection of displacement. In addition, the feedback control signals which regulate the FLC-SLM double-writing signals from PSD are expected to expand the measurable range and increase measurement accuracy. This approach has the advantage of measuring displacements of less than 1.0 ms in successive periods of several milliseconds. Experimental results are presented.

Citation Download Citation

Yuji Kobayashi, Tamiki Takemori, Naohisa Mukohzaka, Narihiro Yoshida, Terushige Hori, and Seiji Fukushima "Displacement meter with ferroelectric liquid crystal spatial light modulator utilizing speckle photography", Proc. SPIE 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation, (20 October 1992); https://doi.org/10.1117/12.132167

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