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Proceedings Paper

Laser diode phase-shifting interferometer operating at a frame rate
Author(s): Ribun Onodera; Norio Onda; Yukihiro Ishii
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Paper Abstract

We have developed a laser-diode phase-shifting interferometer that can capture frame-rate phase-shifted interferograms on a video tape with a high capacity of their storage. A number of the video frame is simultaneously recorded on an audio track of the video tape. The injection-current variation of laser diode in a four-step manner is synchronized with the field pulse of a CCD camera to produce (pi) /2-step phase shifts at a frame rate. An intensity distribution of the interferogram on any frame can be obtained from the video tape with a frame memory by utilizing the recorded frame number. The four successive phase-shifted interferograms are used to calculate a distribution of dynamic phase by a phase-extraction algorithm.

Paper Details

Date Published: 7 May 1999
PDF: 4 pages
Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); doi: 10.1117/12.347703
Show Author Affiliations
Ribun Onodera, Univ. of Industrial Technology (Japan)
Norio Onda, Univ. of Industrial Technology (Japan)
Yukihiro Ishii, Univ. of Industrial Technology (Japan)

Published in SPIE Proceedings Vol. 3740:
Optical Engineering for Sensing and Nanotechnology (ICOSN '99)
Ichirou Yamaguchi, Editor(s)

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