Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-11-13
1992-06-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356356, H01J 516
Patent
active
051189321
ABSTRACT:
A shaft rotation rate sensor for turbine engines. A reflective radial grating on the surface of the turbine shaft is employed in conjunction with an electromagnetic wave source and beam combining elements to mix two beams of frequency f and f.+-..DELTA.f, where .DELTA.f is proportional to the rotation rate of the grating. The source energy is reflected off the grating, and the zero-th and first order transmission from the grating are mixed to give the beat frequency proportional to the rotation rate. The sensor has no moving parts.
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patent: 4987299 (1991-01-01), Kobayashi et al.
"Interferometry," W. H. Steel, Second Edition, Cambridge University Press, 1983, pp. 57-58.
"Optical Frequency Shifting by Means of a Rotating Diffraction Grating," W. H. Stevenson, APPLIED OPTICS, vol. 9, No. 3, Mar. 1970, pp. 949-652.
Brownrigg Patrick C.
Chang David B.
Vali Victor
Denson-Low Wanda K.
Hughes Aircraft Company
Le Que T.
Nelms David C.
Sales Michael W.
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