Radiant energy – Luminophor irradiation
Patent
1989-12-06
1991-09-24
Fields, Carolyn E.
Radiant energy
Luminophor irradiation
250339, 25022714, 250554, 374161, 340578, G01K 1120, G01J 158
Patent
active
050515950
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 radiation detector 18 disposed at a proximal end of the cable 12. Detector 18 is coupled to a fire sensor 20. Detector 18 is sensitive to three wavelength bands including a short wavelength band of approximately 0.8 to 1.1 microns, a mid-wavelength band of approximately 1.3 to 1.5 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 is doped with a material selected for its temperature dependent fluorescent emission characteristics. Radiation from a fire passes via cable 12 to the detector 18. A pulse of radiation from source 28 passes from a coupler 26 and 26a to the cable 12. The fluorescent doping material within the fiber optic cable 12 is pumped by the pulse and is caused to fluoresce within the third wavelength band. A portion of the fluorescent emission passes back through the fiber 12 to the detector 18 where the fluorescent emission is detected and processed to determine the temperature.
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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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