Ultrasonic Imaging Utilizing a Nematic Liquid Crystal

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Abstract
Acousto-optical (birefringence) effect in a homeotropically aligned dielectric-positive material p-n-pentyl p'-cyanobiphenyl has been investigated. A new liquid crystal image converter is developed. In order to improve the resolution, a liquid crystal cell is divided into small arrays, which restrict orienting action of the ultrasound in small regions. Amelioration in the decay time is also made applying a reorienting electric field. The results are successfully interpreted within the framework of our previous model based on the acoustic streaming effect.