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CORRELATION OPTIQUE EN LUMIERE COHERENTE *
Author(s) -
FONTANEL A.,
GRAU G.
Publication year - 1971
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1971.tb00587.x
Subject(s) - optics , holography , convolution (computer science) , diffraction , geophysical prospecting , cardinal point , physics , geology , computer science , geophysics , machine learning , artificial neural network
A bstract F ontanel , A., G. G rau , 1971, Corrélation optique en lumière cohérente, Geophysical Prospecting 19, 98–117. This paper describes a general bidimensional two‐step method of correlation (or convolution) making use of the theory of holography. In the first step the light diffracted by one of the two plane transparent objects to be correlated interferes with the light diffracted by the other one. The hologram thus generated is photographed in the focal image plane of a convergent lens. Owing to the quadratic detection property of the photographic emulsion, the square of the modulus of the product of the spectra of the two objects considered is recorded on the photographic plate. In the second step the convolution product of the two objects appears when the hologram is illuminated with a beam of coherent light. In its geophysical application this optical method of convolution makes it easy for us to obtain the autocorrelogram of a seismic cross‐section. This method also makes it possible to correlate each of the seismic traces by special precalculated optically‐recorded filters.