Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1976-02-17
1977-05-31
Borchelt, Archie R.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
340237S, G01T 118
Patent
active
040271650
ABSTRACT:
This invention relates to an improved smoke-detection system of the ionization-chamber type. In the preferred embodiment, the system utilizes a conventional detector head comprising a measuring ionization chamber, a reference ionization chamber, and a normally non-conductive gas triode for discharging when a threshold concentration of airborne particulates is present in the measuring chamber. The improved system utilizes a measuring ionization chamber which is modified to minimize false alarms and reductions in sensitivity resulting from changes in ambient temperature. In the preferred form of the modification, an annular radiation shield is mounted about the usual radiation source provided to effect ionization in the measuring chamber. The shield is supported by a bimetallic strip which flexes in response to changes in ambient temperature, moving the shield relative to the source so as to vary the radiative area of the source in a manner offsetting temperature-induced variations in the sensitivity of the chamber.
REFERENCES:
patent: 2994768 (1961-08-01), Derfler
patent: 3158028 (1964-11-01), Chope
patent: 3223842 (1965-12-01), Hyde
patent: 3235858 (1966-02-01), Mader
Borchelt Archie R.
Carlson Dean E.
Lewis Fred O.
The United States of America as represented by the United States
Zachry David S.
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