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Proceedings Paper

Displacement meter with ferroelectric liquid crystal spatial light modulator utilizing speckle photography
Author(s): Yuji Kobayashi; Tamiki Takemori; Naohisa Mukohzaka; Narihiro Yoshida; Terushige Hori; Seiji Fukushima
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Paper 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.

Paper Details

Date Published: 20 October 1992
PDF: 7 pages
Proc. SPIE 1720, Intl Symp on Optical Fabrication, Testing, and Surface Evaluation, (20 October 1992); doi: 10.1117/12.132167
Show Author Affiliations
Yuji Kobayashi, Hamamatsu Photonics K.K. (Japan)
Tamiki Takemori, Hamamatsu Photonics K.K. (Japan)
Naohisa Mukohzaka, Hamamatsu Photonics K.K. (Japan)
Narihiro Yoshida, Hamamatsu Photonics K. K. (Japan)
Terushige Hori, Hamamatsu Photonics K.K. (Japan)
Seiji Fukushima, NTT Opto-Electronics Labs. (Japan)


Published in SPIE Proceedings Vol. 1720:
Intl Symp on Optical Fabrication, Testing, and Surface Evaluation

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