Method and apparatus for intensity control of multiple light...

Details Method and apparatus for intensity control of multiple light... Method and apparatus for intensity control of multiple light...

2008-07-29

2008-07-29

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C347S236000, C347S246000

Reexamination Certificate

active

07405384

ABSTRACT:
A method and apparatus for controlling light intensity from two or more light sources. A timing scheme is used to modulate the light sources. Light from the light sources is combined to form a beam and a photo-sensor senses the beam. In a time interval when only one of the light sources is activated, the signal from the photo-sensor is monitored and used in a feedback control circuit to control the active light source.

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