Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-21
1990-01-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250231R, 250231P, H01J 516
Patent
active
048915122
ABSTRACT:
An optically addressed optical fiber sensor system in which light is employed to excite an optical fiber cantilever (6) into mechanical oscillation at a frequency f.sub.o. This oscillation modulates the amplitude of the light launched into the cantilever. The sensed parameter controls the displacement of the free end of the cantilever with respect to the end of the fiber (2) from which light is launched into the cantilever. The magnitude of this displacement affects the magnitudes of the components of modulated light at frequencies f.sub.o and 2f.sub.o. From an analysis of these components a measure of the displacement is obtained, and also a measure of the magnitude of the sensed parameter.
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patent: 4772786 (1988-09-01), Langdon
Patent Abstracts of Japan, vol. 3, No. 153 (E-159), 15th Dec. 1979, p. E 159.
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EP Search Report, Application No. 89 301 530.5.
M. Johnson and R. Ulrich, "Fibre-Optical Relay", Applied Physics Letters, vol. 31, No. 10, Nov. 15, 1977, pp. 675-676.
U.K. Search Report, Application 8803997.
Nelms David C.
Shami Khaled
STC PLC
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