Smoke and flame detector

Details Smoke and flame detector Smoke and flame detector

1983-01-10

1985-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Flame light source

250573, 250239, H05B 3300

Patent

active

045476730

ABSTRACT:
Apparatus for detecting flame or smoke, having a radiation detection tube enclosed in a housing, facing the exterior through a transparent window at one end of the housing, and having a radiation source proximate the other end of the housing and external the tube housing, with an optical path exterior of the housing from the radiation source to a reflector ring positioned in front of the transparent window and in a direction to deflect radiation from the radiation source through the transparent window to the radiation detection tube. The invention also includes a second internal radiation source optically coupled to the radiation detection tube for providing a reference radiation, which not only provides a comparison base for radiation received by the radiation detection tube from external radiation sources, but also provides a monitor function to evaluate the quality of the optical path through the window and to check the operation of the radiation detection tube and related circuits.

REFERENCES:
patent: 3263553 (1966-08-01), Baruch
patent: 3906241 (1975-09-01), Thompson
patent: 4152075 (1979-05-01), Rellstab et al.
patent: 4369364 (1983-01-01), Kuntermann
patent: 4405234 (1983-09-01), Juaire

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