Liquid crystal cell for acoustical imaging

Details Liquid crystal cell for acoustical imaging Liquid crystal cell for acoustical imaging

1979-10-12

1982-07-13

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

350330, G01N 2900, G02F 111

Patent

active

043388213

ABSTRACT:
The invention is related to an acousto-optical liquid crystal cell and the ways of using it in acoustical holography and imaging systems. The molecules of the liquid crystal layer can be reoriented in a direction perpendicular to the direction of an ultrasonic wave propagating in the medium. The cell has multi-layered walls providing high acoustical transparency for waves incident at various angles, such that multiple reflexions and parasitic effects in the liquid crystal are reduced. This results in a wide acoustic imaging field and high resolving power for details of an acoustic object. This cell makes possible the direct and real-time conversion of an acoustical hologram into a visible image representing at will the intensity on the phase variations of ultrasonic waves coming from the internal structures of a body.

REFERENCES:
patent: 3597043 (1971-08-01), Dreyer
patent: 3707323 (1972-12-01), Kessler et al.
patent: 3831434 (1974-08-01), Greguss
patent: 3972733 (1976-08-01), Kamei et al.
patent: 3989354 (1976-11-01), Dubois et al.
patent: 3991606 (1976-11-01), Dreyer
patent: 4156558 (1979-05-01), Grumet
J. L. Dion et al., "A New Hypothesis on Ultrasonic Interaction with a Nematic Liquid Crystal", Applied Physics Letters, vol. 31, No. 8, pp. 490-493, Oct. 1977.
P. Greguss, "A New Liquid Crystal Acoustical-to-Optical Display", Acustica, vol. 29, Heft 1, pp. 52-58, 1973.
S. Nagai et al., "Acousto-Optical Effects in Nematic Liquid Crystal", Revue de Physique Appliquer, vol. 12, No. 2, pp. 21-30, Jan. 1977.
J. L. Dion et al., "Physique Cristalline", Compte Rendu Acad. Sc. Paris, vol. 284, No. 11, pp. 219-222, Mar. 1977.

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