Abstract

An optical arrangement was made on a cascade-type coherent double-diffraction system containing a movable grating and two spatial filters. Heterodyne detection was done by measuring time intervals between zero-crossing times of two sinusoidal waves. A microcomputer and peripheral circuits controlled the entire system. The accuracy of the system was higher than λ/50.

© 1984 Optical Society of America

Double-exposure holographic interferometry using common-path reference waves

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Sensitivity and nonlinearity of optical path difference measurements using triple-exposure heterodyne holographic interferometry

James W. Wagner
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New common-path phase shifting interferometer using a polarization technique

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