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

Ribun Onodera; Yukihiro Ishii

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

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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 π/2-step phase shifts at a frame rate of 1/30 s. An intensity distribution of the interferogram 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-by-frame intensity repeatability is theoretically analyzed. # 1999 society of Photo-Optical Instrumentation Engineers. S0091-3286(99)01812-7

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《Optical Engineering》 |1999年第12期|2045-2049|共5页
作者
Ribun Onodera; Yukihiro Ishii;
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作者单位

University of Industrial Technology,Sagamihara Department of Electronics/ 4-1-1 Hashimotodai, Sagamihara Kanagawa 229-1196, Japan E-mail: onodera @ uitec.ac.jp;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类光学仪器;
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Frame rate phase-shifting interferometer with a frequency-modulated laser diode

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