G - Physics – 01 – H
Patent
G - Physics
01
H
349/29
G01H 9/00 (2006.01) G01H 11/06 (2006.01)
Patent
CA 1204496
ABSTRACT OF THE DISCLOSURE There is disclosed herein an acoustic or ultra- sonic power meter which includes a liquid crystal cell for detecting acoustic energy and a control circuit for applying an electric field to said cell. The liquid crystal cell includes a liquid crystal material having elongated molecules. The preferred liquid crystal is in the form of a layer of the nematic type which is homeo- tropically aligned. The elongated liquid crystal mole- cules exhibit positive dielectric anisotropy wherein the dielectric constant parallel to the molecule's axis is greater than the dielectric constant perpendicular to the molecule's axis. In the unexcited condition, the nematic layer is dark. In the ultrasonically excited condition, the nematic layer exhibits birefringence. A restoring electric force can be applied to the liquid crystal material to suppress the acoustically-induced birefringence condition of the cell to the dark appear- ance associated with the unexcited condition. The strength of the electric field required to suppress the birefringence is proportional to the acoustic intensity of the ultrasonic beam or acoustic field applied to the cell.
423964
Meredith & Finlayson
Raj Technology Partnership
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