Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-02-02
1982-08-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
G01J 132
Patent
active
043429068
ABSTRACT:
Illumination amplifier devices such as liquid crystal devices (LCDs) are controlled with feedback servo arrangements using pulse modulated signals such as pulse width modulated signals or using proportional analog signals. In a preferred embodiment, illumination is controlled with an LCD, where the controlled illumination is monitored with a electro-optical sensor to generate a feedback signal related to a characteristic of the controlled illumination. The feedback signal is processed with an illumination servo to provide a control signal to the LCD for precisely controlling illumination with the LCD. A pulse modulation circuit provides pulse modulation signals to control the LCD, thereby providing a form of proportional control with signals that provide on-off type characteristics. This arrangement provides more precise control for illumination amplifiers and provides proportional control with the illumination amplifier operating in an on-off manner.
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Hyatt Gilbert P.
Nelms David C.
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