Laser diode phase-shifting interferometer operating at a frame rate

Ribun Onodera; Norio Onda; Yukihiro Ishii

doi:10.1117/12.347703

7 May 1999 Laser diode phase-shifting interferometer operating at a frame rate

Ribun Onodera, Norio Onda, Yukihiro Ishii

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347703
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

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.

Citation Download Citation

Ribun Onodera, Norio Onda, and Yukihiro Ishii "Laser diode phase-shifting interferometer operating at a frame rate", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347703

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