Adaptive coherent energy beam formation using phase conjugation

Details Adaptive coherent energy beam formation using phase conjugation Adaptive coherent energy beam formation using phase conjugation

1987-09-21

1989-05-30

Smith, Jerry

Boots, shoes, and leggings

36441313, 73626, G01N 2900

Patent

active

048356891

ABSTRACT:
A method for phase conjugation adaptive reduction of phase aberration effects upon the time delays necessary for information of a beam of coherent energy focused within non-homogeneous medium at a selected range R from, and at an angle .theta. with respect to the normal to, the surface of an array of a plurality N of transducers, each for providing a portion of the energy of the beam when excited and for converting energy reflected thereto to a signal therefrom, first bounces from a large collection of scatterers, contained in a portion of the medium to be investigated, a probe beam for that beam angle .theta.; cross-correlating, for each probe beam, the received signals from each of the (N-1) pairs of adjacent transducers to derive a like number of phase conjugation correction signals; arithmetically operates upon the plurality of phase conjugation correction signals to provide a time correction for the time delay associated with each probe beam transducer, for that range R and angle .theta.; and then modifies by the time correction for each transducer the time delay of both transducer excitations and return signals received from the media portion to be investigated to reduce phase aberration in the resulting image.

REFERENCES:
patent: 4387597 (1983-06-01), Brandestini
patent: 4604697 (1986-05-01), Luthra et al.
patent: 4611494 (1986-09-01), Uchiyama
patent: 4662223 (1987-05-01), Riley et al.

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