Optical pressure sensor

Details Optical pressure sensor Optical pressure sensor

1983-10-31

1986-10-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

73705, 250550, G01D 534

Patent

active

046200932

ABSTRACT:
An optical pressure sensor 10 for measuring the pressure within a container 12 such as a combustion chamber of a rocket engine, wherein pressure sensor 10 comprises a pressure deflectable diaphragm 14 in communication with container 12 and which includes an optical grating 22 on one of its surfaces, means 18 for directing a laser 20 to strike optical grating 22 from a fixed direction to form a central diffracted beam 24 and a first order diffracted beam 26, a photo-position detector 60 for generating signals responsive to the changes in position of the central and first order diffracted beams 24 and 26 resulting from the effects of pressure and temperature upon the diaphragm 14, and means 30 for synthesizing a temperature-adjusted indication of the pressure in the subject container from said responsive signals.

REFERENCES:
patent: 3590640 (1971-07-01), Cindrich
patent: 4160600 (1979-07-01), Luke
patent: 4499373 (1985-02-01), Johnston
patent: 4509370 (1985-04-01), Hirschfeld

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