Laser-diode phase-shifting interferometer with a high-speed camera

Details Laser-diode phase-shifting interferometer with a high-speed camera Laser-diode phase-shifting interferometer with a high-speed camera

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4919..212o&link_type=abstract

Advanced Materials and Devices for Sensing and Imaging. Edited by Yao, Jianquan; Ishii, Yukihiro. Proceedings of the SPIE, Volu

Physics

Scientific paper

We have developed a laser-diode (LD) phase-shifting interferometer that can capture frame-rate phase-shifted interferograms on a video tape in the previous paper. The injection-current variation of LD was synchronized with the field pulse of a CCD camera to produce π/2-step phase shifts in a four-step manner. The four successive phase-shifted interferograms were used to calculate a distribution of frozen phase by a phase-extraction algorithm. In this paper we propose a LD phase-shifting interferometer with a high-speed camera that can record sequences of images from 60 to 8000 frames per second. It permits us to measure a much faster phenomena.

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