Dual spectrum frequency responding fire sensor

Details Dual spectrum frequency responding fire sensor Dual spectrum frequency responding fire sensor

1984-03-23

1987-09-01

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

250339, G08B 1712

Patent

active

046911960

ABSTRACT:
Apparatus for sensing the existence of a fire and providing a warning, if desired, with improved discrimination against the possibility of false alarms. Dual channel detectors are used, one detector being set to respond to incident radiation having a wavelength in the range of 0.8 to 1.1 microns while the other wavelength range is significantly displaced therefrom, being selected for wavelengths in the range from 14 to 25 microns. Reliability of true signal detection is further improved by the provision of separate flame flicker bandpass filters in the respective channels, these bandpass filters being set for different passbands. Circuits providing ratio discrimination, threshold detectors and delay circuitry are combined with the dual spectrum detectors and disparate flicker frequency filters to achieve improved performance. In addition, the dynamic range of instrument sensitivity is substantially increased by utilizing preamplifiers with wide gain variability controlled by automatic gain control circuits in the dual channel circuitry.

REFERENCES:
patent: 3609364 (1971-09-01), Paine et al.
patent: 3716717 (1973-02-01), Scheidweiler et al.
patent: 4280058 (1981-07-01), Tar
patent: 4455487 (1984-06-01), Wendt
patent: 4472715 (1984-09-01), Kern et al.
patent: 4553031 (1985-11-01), Cholin et al.

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