Solid state exposuremeter

Details Solid state exposuremeter Solid state exposuremeter

1991-07-02

1992-07-28

Hannaher, Constantine

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

357 24, 377 58, 35821319, G11C 4034, G11C 1928, H01L 2978

Patent

active

051342758

ABSTRACT:
A Charge-Coupled Device is operable as an exposuremeter during the normal exposure of the parallel register by switching one of the parallel register gates temporarily back and forth between drive circuitry and a sense amplifier. During the exposure of the CCD to photons, the gate potentials are set so that photonic generated charge is stored under one or more phases. An arbitrary gate in the parallel register, designated the sense gate, is disconnected from a normal gate driver and connected to a high input impedance amplifier. The potential on a gate adjacent to the sense gate is changed so that charge is transferred under the sense gate and back again thus producing a voltage transient which is proportional to the total transferred charge.

REFERENCES:
patent: 4007446 (1977-02-01), Elmer et al.
patent: 4471228 (1984-09-01), Nishizawa et al.
patent: 4544848 (1985-10-01), Kawasaki et al.
patent: 4843474 (1989-06-01), Suzuki
patent: 4891826 (1990-01-01), Yang

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