Thermal detection arrangement having a plurality of optical filt

Details Thermal detection arrangement having a plurality of optical filt Thermal detection arrangement having a plurality of optical filt

1991-04-22

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

250226, 250339, 250342, 340578, G01J 710

Patent

active

051626586

ABSTRACT:
A thermal detector arrangement includes a number of channels, each including a collimator for collimating incident radiation to a respective optical filter. Each optical filter has a respective radiation passband characteristic with one having a passband spanning the passbands of all of the other optical filters. The radiation passed by each optical filter is passed to a thermal detector, which preferably is in the form of a thermally isolating membrane acting as a radiation absorbent cavity and supported by a semiconductor substrate. The output signals from the thermal detectors are multiplexed, amplified by an amplifier having voltage offset compensation and digitally processed to provide an indication of a fire to be sensed.

REFERENCES:
patent: 3267727 (1966-08-01), Benzinger
patent: 4035643 (1977-07-01), Barrett
patent: 4471221 (1984-09-01), Middleton et al.
patent: 4691196 (1987-09-01), Kern et al.

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