Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-07-16
1987-12-15
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73800, 7386259, 250231P, G01L 110, G01D 526
Patent
active
047135409
ABSTRACT:
Vibrating resonant mechanical structures are excited optically by photokinetic energy transfer and detected optically. In particular, a tuning fork sensor measuring a physical parameter is excited into oscillation by radiant energy and the frequency of vibration is detected by radiant energy which may be communicated via an optical fiber. These vibrations are communicated via a fiber optic to a detection location.
REFERENCES:
patent: 4379226 (1983-04-01), Sichling et al.
patent: 4470313 (1984-09-01), Kalinoski et al.
patent: 4678905 (1987-07-01), Phillips
Rosencwaig, "Photoacoustic Spectroscopy of Solids", Physics Today, Sep. 1975, vol. 28, No. 9, pp. 23-30.
Johnson et al., "Fiber-Optical Relay", Applied Physics Letters, Nov. 1977, vol. 31, No. 10, pp. 675-676.
Balaev et al., "Fiber-Optic Transducers of Physical Field Parameters", Soviet Journal of Quantum Electronics, vol. 14, No. 1, Jan. 1984, pp. 5-17.
Venkatesh et al., "Optically Activated Resonant Sensors", Fiber Optic & Laser Sensors III, SPIE Conference 566, San Diego, Aug. 85, pp. 1-4.
Venkatesh et al., "Optically Activated Vibrations in a Micromachined Silica Structure", Electronic Letters, vol. 21, No. 8, Apr. 1985, pp. 315-317.
Author unknown, "Scots Experts Throw Light on Sensor Problem", Electronics Times (UK), Jul. 1985.
Gilby Anthony C.
Ihnat Dale E.
Martin Terrence
Meyer William E.
The Foxboro Company
Westin Edward P.
Wu Jack H.
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