Ionization detector

Details Ionization detector Ionization detector

G - Physics

01

T

358/21

G01T 1/18 (2006.01)

Patent

CA 1091824

IONIZATION DETECTOR Abstract of the Disclosure An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in a least on of the chambers and a vernior adjusting screw electrode protruding into one chamber. The chamber containing the adjustable elec- trode is more open to the atmosphere than the other chamber. Porting is provided between chambers and detection occurs by sensing the rate of change of ionization current in the chamber structure. The source of sources, one being in each chamber, is a beta source such as a nickel 63 source. A change in ionization current is detected by a unique circuit of this invention which comprises a programmable unijunction transistor oscillator circuit. 1.

342753

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