Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-09-17
1991-12-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250225, 25022721, 356375, G01D 530
Patent
active
050737112
ABSTRACT:
A sensor for remotely detecting an angular position of a shaft rotatable within a frame includes: first means for generating collimated first, second, third, and polarized optical beams; second means positioned proximate to the first means for receiving and combining the first, second, third, and polarized optical beams into a composite optical beam having an intensity; and a code wheel fixedly mounted to the shaft and interposed between the first and second means. The code wheel includes first, second, and third channel mask patterns and a first polarizing filter positioned to transect the first, second, third, and polarized optical beams, respectively. Interaction between the code wheel and the light beams results in the composite light beam being encoded such that the angular position of the wheel is functionally related to the intensity of the composite opitical beam. The sensor further includes third means operably coupled to receive the composite optical beam for providing an output corresponding to the angular position of the code wheel.
REFERENCES:
patent: 4577414 (1986-03-01), Migliori et al.
"Thesis": Methods of Remote Optical Angle Measurement with Compass Applicons, by Newsmaster, Thomas, Naval Post Graduate School, Monterey, CA, Sep. 1987.
"Fiber Optic Sensors Offer Advantages for Aircraft", Lewis, Norris, Optical Engineering Reports, Jun. 1987.
Varshneya, D. Maida, J. L., and Hakman E. D., "Fiber Optic and Laser Sensors V", De Paula and Udd, ed., Proc SPIE, 838 (1987).
Brininstool Michael R.
Garrett Steven L.
Newmaster Jeffrey T.
Davenport T.
Fendelman Harvey
Kagan Michael A.
Keough Thomas Glenn
Nelms David C.
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