Fire sensor cross-correlator circuit and method

Details Fire sensor cross-correlator circuit and method Fire sensor cross-correlator circuit and method

1985-05-17

1987-01-27

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, 340578, G08B 1712

Patent

active

046395989

ABSTRACT:
A cross-correlation fire sensor circuit includes detectors responsive to heat and light radiation, respectively. Electrical signals from the detectors are processed in two distinct channels through low pass filters and samplers. The sampled signals from the two channels are multipled together and the products are summed over a selected interval to provide a correlation function. This function is compared with an adjustable threshold to provide an indication of fire sensing. The circuit is also included as an adjunct to an existing system to provide improved sensitivity for fire sensing in the presence of noise and enhanced discrimination against false alarms. A ratio window detector circuit is disclosed as an alternative cross-correlator for detected radiation.

REFERENCES:
patent: 4469944 (1984-09-01), Kern et al.

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