Optical position detector for determining the angular position o

Details Optical position detector for determining the angular position o Optical position detector for determining the angular position o

1995-10-03

1997-09-23

Turner, Samuel A.

Optics: measuring and testing

Angle measuring or angular axial alignment

25023113, G01D 534

Patent

active

056710437

ABSTRACT:
An optical position detector for determining the angular position of a rotating element and being virtually insensitive to any unwanted radial movement of the rotating element. The position detector having a first light source and a second light source, each positioned proximate one end of the rotating element and positioned diametrically opposed from one another. Four light detectors are optically aligned with the first and second light sources for receiving light therefrom and for providing an output indicative of the amount of light received. An opaque flat element being interconnected to the one end of the rotating element for preventing a preselected amount of light emanating from the first and second light sources from being received by the light detectors. The first and second light sources and the light detectors cooperating with each other in such a manner that the output from the light detectors is virtually unaffected by any unwanted radial movement of the rotating element. The output from the light detectors is received by a circuit which provides a signal indicative of the angular position of the rotating element.

REFERENCES:
patent: 4056722 (1977-11-01), Ray
patent: 4864295 (1989-09-01), Rohr
patent: 5235180 (1993-08-01), Montagu
Montagu, Jean and Bukys, Al, Moving Magnet Galvanometer Scanners, Technical Note Dec. 1992, Space Microdynamics and Accurate Control Symposium, Dec. 1, 1992.
6800/CB6588 Mirror Positioning System Instruction Manual, Cambridge Technology, Inc., Watertown, Mass. 1989 to Feb. 1, 1994.

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