Flux monitor high light intensity cut-off circit for night visio

Details Flux monitor high light intensity cut-off circit for night visio Flux monitor high light intensity cut-off circit for night visio

1991-02-06

1992-10-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

315360, H01J 4014

Patent

active

051534240

ABSTRACT:
A flux monitor high light intensity cut-off circuit for a night vision device which includes a photo detector and an integrator. Incident light striking the photo detector causes its resistance to change, resulting in a voltage change at the photo detector. As long as the photo detector voltage is below a first threshold voltage level, the integrator is inoperative. When the voltage at the photo detector exceeds the first threshold voltage level, this voltage is then applied to the input of the integrator. The integrator then produces an output voltage proportional to the integral of the input current. Once the output voltage of the integrator reaches a second threshold voltage, power to an image intensifier assembly within the night vision device is interrupted.

REFERENCES:
patent: 4663521 (1987-05-01), Maile
patent: 4755725 (1988-07-01), Kastendieck et al.
patent: 4843229 (1989-06-01), Reed et al.
patent: 4851660 (1989-07-01), Juds et al.
patent: 4982176 (1991-01-01), Schwarz

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