Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-12-30
1987-05-19
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, 73705, 350 9629, G01L 110
Patent
active
046670971
ABSTRACT:
A microbending optical fiber is attached under tension to a diaphragm to se a differential pressure applied across the diaphragm which it causes it to deflect. The fiber is attached to the diaphragm so that one portion of the fiber, attached to a central portion of the diaphragm, undergoes a change in tension; proportional to the differential pressure applied to the diaphragm while a second portion attached at the periphery of the diaphragm remains at a reference tension. Both portions of the fiber are caused to vibrate at their natural frequencies. Light transmitted through the fiber is attenuated by both portions of the tensioned sections of the fiber by an amount which increases with the curvature of fiber bending so that the light signal is modulated by both portions of the fiber at separate frequencies. The modulated light signal is transduced into a electrical signal. The separate modulation signals are detected to generate separate signals having frequencies corresponding to the reference and measuring vibrating sections of the continuous fiber, respectively. A signal proportional to the difference between these signals is generated which is indicative of the measured pressure differential across the diaphragm. The reference portion of the fiber is used to compensate the pressure signal for zero and span changes resulting from ambient temperature and humidity effects upon the fiber and the transducer fixture.
REFERENCES:
patent: 4564289 (1986-01-01), Spillman, Jr.
patent: 4600836 (1986-07-01), Berthold, III et al.
Fasching George E.
Goff David R.
Breeden David E.
Hamel Stephen D.
Hightower Judson R.
The United States of America as represented by the Department of
Westin Edward P.
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