Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-06-03
1993-04-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023119, 36457101, H01J 4014
Patent
active
052006107
ABSTRACT:
A fiber optic microphone is provided for measuring fluctuating pressures. An optical fiber probe having at least one transmitting fiber for transmitting light to a pressure-sensing membrane and at least one receiving fiber for receiving light reflected from a stretched membrane is provided. The pressure-sensing membrane may be stretched for high frequency response. Further, a reflecting surface of the pressure-sensing membrane may have dimensions which substantially correspond to dimensions of a cross section of the optical fiber probe. Further, the fiber optic microphone can be made of materials for use in high temperature environments, for example greater than 1000.degree. F. A fiber optic probe is also provided with a backplate for damping membrane motion. The backplate further provides a means for on-line calibration of the microphone.
REFERENCES:
patent: 4902964 (1990-02-01), Szabela et al.
patent: 5046028 (1991-09-01), Bryan et al.
Cuomo Frank W.
Robbins William E.
Zuckerwar Allan J.
Le Que T.
Nelms David C.
Osborne Kevin B.
The United States of America as represented by the Administrator
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