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Instantaneous phase-shifted speckle interferometer for measurement of large optical structures

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Abstract

An instantaneous phase-shifting interferometer (PhaseCam, 4D Technology) was modified to a speckle phase-shifted interferometer. This interferometer was used to measure “diffused” objects such as a carbon fiber. Repeatability, accuracy, and dynamic range of the interferometer were measured. Different phase shifting algorithms were utilized to get rid of the high frequency speckle that modulates the low frequency fringes.

© 2003 Optical Society of America

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