Ultrasonic detector cell and system

G - Physics – 01 – H

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G01H 9/00 (2006.01) G02F 1/13 (2006.01)

Patent

CA 1246201

ABSTRACT OF THE DISCLOSURE There is disclosed herein an orthoscopic ultra- sonic imaging system which includes an acoustic trans- ducer for insonifying an object to be inspected and an improved liquid crystal detector cell for receiving an imaging beam from the insonified object and for displaying a visible image. An electric, magnetic or acoustic biasing field is applied to the liquid crystal cell for raising the cell to an acousto-optic threshold which permits detec- tion and display of low intensity imaging signals. The cell surfaces which contact the liquid crystal material are treated so as to preferentially align the liquid crystal molecules for situations where electric or mag- netic field biasing is used. Preferential alignment means that the longitudinal axis of the molecules are on average parallel to each other as indicated by the bulk director. Furthermore, when an electric biasing field is employed, the surface treatment to be used is selec- ted in relation to the dielectric properties of the chosen liquid crystal material. The operation of the system described herein is based upon the effect of liquid crystal/contact surface interaction; liquid crystal/biasing field interaction; and liquid crystal/imaging beam interaction on the ori- entation of the sample director. Using the improved liquid crystal system, low intensity, acoustic fields [e.g. less than 10-3 w/cm2 (watts per square centimeter)] can be detected and displayed, and the object being ex- amined can be insonified with low intensity ultrasonic beams.

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