Abstract

Processing of geophysical data can be accomplished by optical diffraction. The data are in the form of transmissive recordings, environmental photographs, or. drawings. Five analyses can be performed at or near the Fraunhofer diffraction plane with single diffraction, three analyses through spatial filtering with double diffraction, and one (correlation) with triple diffraction. Primary emphasis is on the processing of variable-density seismograms, for which a special recorder has been constructed. Spatial filtering has also been applied to cloud cover pictures and contour maps.

© 1965 Optical Society of America

Optical Processing of Underground Sound Waves in Seismic Exploration for Oil

M. B. Dobrin
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Optical Aids in Signal Processing

Fordyce Tuttle
Appl. Opt. 4(2) 149-155 (1965)

Spatial Filtering for Detection of Signals Submerged in Noise

Adam Kozma and David Lee Kelly
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Character Recognition by Incoherent Spatial Filtering

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Theta Modulation in Optics

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Appl. Opt. 4(4) 399-403 (1965)