Abstract

An interferometry system is presented that is useful in large-scale measurements such as those of topographic maps. The envelope of a propagating wave is used to create the desired fringe patterns, representing range contours, through the interference of a light modulation function and an image modulation function. A number of variations are shown that either provide altitude contours or place the contour information on a spatial frequency carrier. This latter system offers the flexibility of electronic processing when the image is scanned. The comparison of contour patterns taken at different times provides an accurate indication of subtle surface deformations.

© 1974 Optical Society of America

Measurement of Deformation in a Cylindrical Shell by Holographic Interferometry

T. Matsumoto, K. Iwata, and R. Nagata
Appl. Opt. 13(5) 1080-1084 (1974)

Digital Wavefront Measuring Interferometer for Testing Optical Surfaces and Lenses

J. H. Bruning, D. R. Herriott, J. E. Gallagher, D. P. Rosenfeld, A. D. White, and D. J. Brangaccio
Appl. Opt. 13(11) 2693-2703 (1974)

Surface Roughness Measurement by Two Wavelength Holographic Interferometry

William B. Ribbens
Appl. Opt. 13(5) 1085-1088 (1974)

Observation of Large Particles with a Laser Interferometer

W. M. Farmer
Appl. Opt. 13(3) 610-622 (1974)

Optical Filtering of Aeromagnetic Maps

H. H. Arsenault, M. K. Séuin, and N. Brousseau
Appl. Opt. 13(5) 1013-1017 (1974)