Method and apparatus for exposure control in light-based measure

Details Method and apparatus for exposure control in light-based measure Method and apparatus for exposure control in light-based measure

1996-01-17

1997-09-09

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502081, 348314, 377 58, H04N 5217, G11C 2704, G01J 132

Patent

active

056659580

ABSTRACT:
A method and apparatus for nearly instantaneous and wide dynamic range exposure control in light-based measurement instruments. The excess charge drained from a CCD array by anti-blooming circuitry is effectively monitored and distinguished from leakage current. Detection of the drained charge generates a signal to deactivate the light source exposing the CCD array. The exposure control device includes a unique circuit for detecting the operating state of an anti-blooming circuit associated with a CCD array, and a unique laser light driver that ramps up the light intensity of the laser light source in an approximately exponential manner.

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