Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-09-13
1979-07-24
Dahl, Lawrence J.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
358128, G01J 132
Patent
active
041623983
ABSTRACT:
A bias control circuit for light modulator includes a feedback control loop through which a measure of the modulated laser beam is processed to derive an error correction signal which is superimposed on the normal bias potential to shift the bias point in the same direction as the direction of shift of the operating curve of the light modulator due to the heat generated therein during operation. A feed-forward control loop is also provided to cancel an error signal in the feedback control loop resulting from an intentional gradial variation of the laser beam intensity prior to the modulation so that the average light intensity of the modulated laser beam is correspondingly varied.
Dahl Lawrence J.
Victor Company of Japan , Limited
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