Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-03-02
2000-01-11
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
353 87, G01J 132, G03B 2132
Patent
active
060139110
ABSTRACT:
The present invention is a system and method to quickly and accurately measure the luminance and luminance distribution of a light on the surface of an object so that the position of the lamp can be adjusted relative to the projector optics to obtain the best luminance available for that object. A scanning light receiver, which produces an optical image of the object whose luminance is to be tested, is set up so that it may view a substantial portion of the surface of the object. The light receiver is connected to a analyzer and control unit ("ACU") to which it sends an electronic image representing the reflected luminance of the surface during each scan. The reflected light that is detected by the light receiver is then analyzed by the ACU to determine the luminance levels and distribution across a substantial portion of the surface by measuring the voltage of each pixel detected by the light receiver measured against the voltage produced by a black level. Once this analysis is complete, the ACU sends the results to a driver interface unit which is connected to a light source position controller in the projector which continuously adjusts the position of the light source relative to the projector optics until optimal luminance and luminance distribution is achieved across the viewing surface. For example, using the method and system of the present invention, the position of the lamp continually and automatically may be fine tuned until optimum luminance is achieved.
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Cashin James A.
Hibbard Earl Roger
Jennings, III Gordon Henry
Larsen Steinar
Wright Bevan
Christie, Inc.
Kinnear Glenn T
Ultra Stereo Labs Inc.
Vaccaro Andra M.
Westin Edward P.
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