Temperature and pressure compensated elasto-optic sensor

Details Temperature and pressure compensated elasto-optic sensor Temperature and pressure compensated elasto-optic sensor

1983-03-07

1985-05-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

367140, 367149, 367174, 73655, G02F 101

Patent

active

045188572

ABSTRACT:
A pressure and temperature compensated acoustic transducer utilizing a pressure sensitive birefringent element coupled between a flexible diaphragm sealing the transducer and an internal variable rigid diaphragm that forms two internal chambers. Relatively rapid variation in pressure applied to the birefrigent element cause fluctuations in the phase difference between orthogonal components of a polarized light beam traversing the photo-elastic material. Detections of this phase difference variation provides signals representative of incident acoustic signals. Provision for the transfer of liquid filling the chambers permits the equalization between the two chambers of slowly varying internal pressures caused by changes in external ambient pressure and temperature.

REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4296318 (1981-10-01), Mezzetti et al.
patent: 4405198 (1983-09-01), Taylor
patent: 4471474 (1984-09-01), Fields

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