Ultraviolet wavelength smoke detector

Details Ultraviolet wavelength smoke detector Ultraviolet wavelength smoke detector

1975-10-10

1976-09-21

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Ultraviolet light responsive means

340237S, 356 51, 356205, 356207, G01N 2112, G01N 2126

Patent

active

039821307

ABSTRACT:
Collimated ultraviolet light radiation at wavelengths of 2537A and 3129A is alternately directed across the space to be monitored for smoke indicative of a fire. A "cats eye" mirror at the far side of the monitored space returns the ultraviolet rays to a photomultiplier detector adjacent the light source. Smoke, for example pine smoke having a particle mean diameter of 1.4 to 3.0 micrometers, will attenuate the shorter wavelength beam much more than the longer wavelength beam. Approximately 1.3 times greater attenuation is inflicted on the 2537A beam than on the 3129A by the pine smoke. Thus, returning beam signals having this ratio of signal levels will provide an indication of a pine fire. Particles of a different diameter intercepting the beam will produce a different ratio of attenuated signals.

REFERENCES:
patent: 2369966 (1945-02-01), Hawkins
patent: 3770356 (1973-11-01), Kimura
patent: 3857641 (1974-12-01), Gass

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