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Optical Engineering

Frame rate phase-shifting interferometer with a frequency-modulated laser diode
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Paper Abstract

We develop a laser-diode phase-shifting interferometer that can capture frame-rate phase-shifted interferograms on a video tape with a high capacity for their storage. The number of the video frame is simultaneously recorded on an audio track of the video tape. In a four- step manner, the injection-current variation of the laser diode is synchronized with the field pulse of a CCD camera to produce ?/2-step phase shifts at a frame rate of 1/30 s. An intensity distribution of the interfero- gram on any frame can be determined through a video tape with a frame memory using the recorded frame number. The four successive phase- shifted interferograms are used to calculate a distribution of frozen phase by a phase-extraction algorithm. The phase error due to the frame-byframe intensity repeatability is theoretically analyzed.

Paper Details

Date Published: 1 December 1999
PDF: 5 pages
Opt. Eng. 38(12) doi: 10.1117/1.602309
Published in: Optical Engineering Volume 38, Issue 12
Show Author Affiliations
Ribun Onodera, Univ. of Industrial Technology (Japan)
Yukihiro Ishii, Univ. of Industrial Technology (Japan)

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