G - Physics – 01 – N
Patent
G - Physics
01
N
349/36
G01N 29/04 (2006.01) A61B 8/00 (2006.01) G01H 9/00 (2006.01) G02F 1/13 (2006.01)
Patent
CA 1212447
ABSTRACT OF THE DISCLOSURE There is disclosed herein an ultrasonic imaging system for use in non-destructively testing objects, which system includes a source of ultrasonic energy, a liquid crystal detector cell and an optical viewing sys- tem. The liquid crystal detector cell includes a pair of acoustically transmissive covers which encase a nema- tic liquid crystal material. The material exhibits an acousto-optic effect, and in particular, exhibits bire- fringence in response to ultrasonic energy. The cell construction, geometry, and material are acoustically matched to the frequencies of the insonifying ultrasonic transducer so as to optimize the performance of the cell. The covers are substantially acoustically transparent to ultrasonic energy incident on the cover at both normal and oblique attitudes. The acoustic impedance of the covers match as closely as possible to that of the cou- pling medium. The average alignment of the liquid crys- tal molecules, as indicated by the director, is selec- tively aligned to be oblique to the ultrasonic beam, and by reason thereof the cell exhibits high sensitivity and high image resolution in the "non-streaming" region. Electric field enhancement may be used to cooperate in aligning the liquid crystal molecules and to enhance the resolution and sensitivity of the image.
432635
Meredith & Finlayson
Raj Technology Partnership
LandOfFree
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