Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1989-12-06
1991-09-24
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
25022714, 250554, 374161, 340578, G01J 100
Patent
active
050515900
ABSTRACT:
A fiber optic fire detection and temperature measurement system 10 includes a fiber optic cable 12 having a lens 14 at a distal to direct radiation from a fire 16 into the cable 12 and to a radiation detector 18 disposed at a proximal end of the cable 12. Detector 18 is coupled to a fire sensor 20. The detector 18 is sensitive to three wavelength bands including a short wavelength band of approximately 0.8 to 1.1 microns and a long-wavelength band of approximately 1.8 to 2.1 microns. A controller 22, analyzes the fire sensor 20 output signals which correspond to the two spectral bands to determine if a fire is present. The fiber optic conductor of cable 12 includes an optical filter 32 having a temperature dependent radiation transmission characteristic. Radiation from a fire passes via cable 12 to the detector 18. A dual wavelength pulse of radiation from a source 28 passes through the filter 32 where a reference wavelength, corresponding to one of the fire sensor spectral bands, passes through unimpeded while the other wavelength within a third spectral band is absorbed as a function of temperture. The detector includes third element 18c for detecting the third spectral band and includes circuitry 54 for determining the temperature of the coupler 30.
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Kern Mark T.
Shamordola Kenneth A.
Tangonan Gregory L.
Wetzork John M.
Beyer James E.
Denson-Low W. K.
Fields Carolyn E.
Santa Barbara Research Center
Schubert W. C.
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