Measuring and testing – Vibration – By mechanical waves
Patent
1986-11-26
1988-12-06
Chapman, John
Measuring and testing
Vibration
By mechanical waves
350330, G01N 2904, G02F 111
Patent
active
047888652
ABSTRACT:
An acoustic imaging system which employs a liquid crystal cell for detecting acoustic energy and displaying an image. The cell includes a layer of liquid crystal material which is disposed between and encapsulated by a pair of cover members. At least one of the cover members is a laminated structure having at least two plies. The plies are of different materials and the thickness of each ply is governed by the expression n .lambda./2, where n is an integer, and .lambda. is the wavelength of the acoustic energy in the cover materials. This structure enhances cell rigidity and the uniform of thickness of the liquid crystal layer in larger sized cells, while maintaining good transmission for energy angularly incident on the cell.
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Dion et al., "Pseudo-Holographic Acoustical Imaging with a Liquid Crystal Convertor", vol. 10, Acoustical Imaging, Plenum Press, 1982, pp. 151-166.
Chapman John
Raj Technology, Inc.
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