Balanced digital infrared detector circuit

Details Balanced digital infrared detector circuit Balanced digital infrared detector circuit

1989-08-31

1990-07-10

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250210, 250340, 307117, 340587, G08B 1318

Patent

active

049409670

ABSTRACT:
A digital control circuit uses a single infrared detector to control the clock pulse on a digital counter so that the sensitivity control is based on the length of time a change in infrared radiation persists. A pyroelective detector is located in a voltage divider and the intermediate voltage of the divider is digitally compared to the intermediate voltage in a fixed divider as a digitaly controlled pulse is applied to both dividers. Either an increase or a decrease of infrared radiation causes the digital circuit to permit the counter to be activated.

REFERENCES:
patent: 3636542 (1972-01-01), Apple
patent: 3725888 (1973-04-01), Solomon
patent: 3840868 (1974-10-01), Campman
patent: 3858192 (1974-12-01), Fischer
patent: 4052716 (1977-10-01), Mortensen
patent: 4242670 (1980-12-01), Smith
patent: 4364030 (1982-12-01), Rossin
patent: 4377808 (1983-03-01), Kao
patent: 4570157 (1986-01-01), Kodaira

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