Feedback stabilized digital infrared detector circuit

Details Feedback stabilized digital infrared detector circuit Feedback stabilized digital infrared detector circuit

1989-03-17

1990-05-29

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250221, 315159, 340567, G01J 522

Patent

active

049298330

ABSTRACT:
A digital infrared detector circuit which converts changes in detector current to time varying pulses and uses feedback to adjust the coincidence of a reference signal with the trigger signal to accommodate to circuit variations caused by changes in infrared detector sensitivity or ambient temperature. To supply a highly accurate feedback reference signal an internal high frequency oscillator is used for feedback control and counted down to furnish the reference signal. The conversion from detector current to time is accomplished by using the detector to discharge an accurately charged capacitor and measuring the time to recharge the capacitor.

REFERENCES:
patent: 4618770 (1986-10-01), Maile
patent: 4633086 (1986-12-01), Parrish
patent: 4677294 (1987-06-01), Spector
patent: 4705946 (1987-11-01), Cargille
patent: 4843283 (1989-06-01), Chen
patent: 4873469 (1989-10-01), Young et al.

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