Smoke detector apparatus and ionization chamber therefor

Details Smoke detector apparatus and ionization chamber therefor Smoke detector apparatus and ionization chamber therefor

1977-02-10

1979-09-11

Rolinec, Rudolph V.

Electric lamp and discharge devices

With radioactive material

250381, 340629, G01N 2312

Patent

active

041676874

ABSTRACT:
A smoke detection apparatus is disclosed having a highly efficient ionization chamber. The ionization chamber is primarily formed by a wire mesh collector that readily admits products of combustion such as smoke into the chamber which has therein an alpha emitting, radioactive source and a selectable portion of a tuning screw. Two types of smoke detectors are shown utilizing the ionization chamber with one of the detectors operating from a conventional A.C. power source and the other being battery operated. The smoke detector utilizing the conventional A.C. power source requires no transformer and has the alarm indicating horn connected with the A.C. source with the horn being triggered by a silicon controlled rectifier connected with the radioactive source in the ionization chamber through a field effect transistor switch. A rectified and regulated D.C. voltage is provided to the wire mesh collector and to the field effect transistor switch. The battery operated smoke detector has the alarm indicating horn connected with batteries through a transistor horn drive circuit that is triggered by a field effect transistor switch connected to the radioactive source within the ionization chamber. A circuit is provided to indicate low battery voltage and a regulated D.C. voltage is supplied to the wire mesh collector of the ionization chamber, to the field effect transistor switch, and to the low voltage indicating circuit.

REFERENCES:
patent: 3935492 (1976-01-01), Sasaki et al.
patent: 4021671 (1977-05-01), Solomon

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