Holographic method for conversion of waves

Details Holographic method for conversion of waves Holographic method for conversion of waves

1979-05-25

1982-02-09

Corbin, John K.

73603, G03H 300

Patent

active

043147399

ABSTRACT:
A new halographic method for converting one wave into another wave by means of a hologram is disclosed. This method comprises mixing an object wave with a reference wave whose wave front in the hologram plane is different from that of the actual reconstruction wave in the same plane. The phases and possibly also the amplitudes of these two wave fronts are combined in such a way that compensation is obtained for imaging errors caused by mutual inconsistencies between the wavelength ratio, the hologram scaling and the object scaling, and a displacement of the reconstructed object relative to the hologram. The reference wave and the reconstruction wave are chosen so that the converted object wave field becomes "as equal as possible" to a wave field coming from another but geometrically similar object at a different wavelength. In an example concerning seismic holography a formular for choosing a proper synthetic reference wave is given. The formula together with a computer program for acoustic wave propagation is used to compute the transmission function of a synthetic hologram, from which faithful optical reconstructions are obtained of simulated objects.

REFERENCES:
patent: 3756683 (1973-09-01), Smith, Jr.

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