Ionization detector

Details Ionization detector Ionization detector

1976-11-08

1978-10-17

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

G01T 118

Patent

active

041211057

ABSTRACT:
An ionization detecting fire alarm device that comprises a double chamber structure, a source disposed in at least one of the chambers and a vernier adjusting screw electrode protruding into one chamber. The chamber containing the adjustable electrode 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 or 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.

REFERENCES:
patent: 3514603 (1970-05-01), Klein
patent: 3681603 (1972-08-01), Scheidweiler et al.
patent: 3728706 (1973-04-01), Tipton et al.
patent: 4021671 (1977-05-01), Solomon

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