Abstract

A method of real-time heterodyne imaging interferometry using a three-phase correlation image sensor (3PCIS) is proposed. It simultaneously demodulates the amplitude and phase images of an incident interference pattern at an ordinary frame rate with good accuracy, thus overcoming the trade-off among measurement time, spatial resolution, and demodulation accuracy suffered in conventional interferometry. An experimental system is constructed with a 64×64 3PCIS camera operated at 30  frames∕s and a two-frequency He–Ne laser with a beat frequency of 25   kHz. The results obtained for a scanning mirror and heated silicone oil confirm the proposed method.

© 2007 Optical Society of America

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