Infrared detector with pyroelectric detector element and chopper

Details Infrared detector with pyroelectric detector element and chopper Infrared detector with pyroelectric detector element and chopper

1992-10-16

1993-11-16

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503383, 250342, G01J 562

Patent

active

052626474

ABSTRACT:
An infrared detector with a pyroelectric detector element and an AC amplifier has a chopper control circuit that enables the detector to sense either a moving person or temperature. When used to sense a moving person, the chopper control circuit stops operation of the chopper, and the gain of the amplifier is increased. When used to sense temperature, the chopper is operational, the gain of the amplifier is decreased, and total infrared energy is measured.

REFERENCES:
patent: 4825075 (1989-04-01), Jacoby et al.

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