Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-09-07
1990-09-18
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
33363K, 25022712, 250225, 341 14, G01C 1726, G02F 101
Patent
active
049580728
ABSTRACT:
A method for remotely detecting the angular position of a rotatable code wheel is provided by generating two sine wave modulated light beams which are orthogonally polarized with respect to each other. The beams are combined and then directed through a polarization filter mounted on the code wheel. The combined beam incurs a phase shift with respect to a reference signal which depends upon the position of the code wheel. The combined polarized beam provides angular position resolution between zero and ninety degrees, but lacks quadrant resolution. Two other light beams are directed to a two channel digital mask pattern imprinted on the code wheel. The mask pattern encodes these latter beams with "on" or "off" pulses to provide quadrant resolution. The beams are converted to digital electric signals which are received by a programmable read oly memory (PROM). The PROM provides an output corresponding to the angular position of the code wheel to a display.
REFERENCES:
patent: 4577414 (1986-03-01), Migliori et al.
patent: 4650996 (1987-03-01), Maehara et al.
J. T. Newmaster et al., "Remote Fiber Optic Sensors for Angular Orientati; Fiber Optic and Laser Sensors V. Proceedings of SPEI-The Int'l Soc. for Opt. Eng.; vol. 838; Mar. 1988.
J. T. Newmaster et al., "Channel Reduction Schemes for Fiber-Optic Angle Encoders"; Fiber and Integrated Optics, vol. 7; pp. 115-137; Mar. 1988.
J. L. Maida, Jr. et al.; "Fiber Optic Rotary Position Sensor"; Fiber Optic and Laser Sensors V. SPIE vol. 838; Mar. 1988.
Varshneya, "Applications of Time and Wavelength Division Multiplexing to Digital Optical Code Plates"; Fiber Optic and Laser Sensors V. SPIE vol. 838; pp. 210-213; Mar. 1988.
Brininstool Michael R.
Garrett Steven L.
Hofler Thomas
Newmaster Jeffrey T.
Fendelman Harvey
Kagan Michael A.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
Westin Edward P.
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