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

1997-05-16

1998-10-13

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

315151, 372 29, G01J 132

Patent

active

058215271

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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