Abstract

Two optical correlation techniques for determining strain in materials are discussed. With the first method, strain is evaluated by measuring longitudinal variations in the separation between the object and the holographic filter. With the second method, a more direct determination of strain is made by simply measuring accurately the lateral displacement of two correlated areas. Experiments indicated that both methods have a sensitivity of about 10 ppm, with the potential of a slight further improvement.

© 1970 Optical Society of America

Strain measurement by heterodyne holographic interferometry

Ruedi Thalmann and Rene Dändliker
Appl. Opt. 26(10) 1964-1971 (1987)

Holographic Measurement of General Forms of Motion

M. Zambuto and M. Lurie
Appl. Opt. 9(9) 2066-2072 (1970)

Real-time optical scanning correlator

F. T. S. Yu and X. J. Lu
Appl. Opt. 23(18) 3109-3116 (1984)

Real-time optical correlation

Peter Nisenson and Robert A. Sprague
Appl. Opt. 14(11) 2602-2606 (1975)

An Improved Read-in Technique for Optical Delay Line Correlators

M. P. Wenkoff and M. Katchky
Appl. Opt. 9(1) 135-147 (1970)