Capacitive shift fire detection device

Details Capacitive shift fire detection device Capacitive shift fire detection device

1979-05-04

1980-09-09

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

Specific condition

235 92CA, 340562, 340658, 340661, G08B 1710

Patent

active

042220459

ABSTRACT:
A capacitive shift fire detection device having a sample circuit and a reference circuit, each circuit having an air capacitor connected to an oscillator and a counter. The presence of particles of combustion in the ambient environment results in a change in the dielectric constant of the air dielectric of the sample capacitor, thus changing its capacitance. This change in capacitance is detected by an oscillator in the sample circuit, the mismatch of oscillators in the two circuits causing an exclusive OR-gate to go high, activating an alarm system.

REFERENCES:
patent: 1870181 (1932-08-01), Mallory
patent: 2088295 (1937-07-01), Hubble
patent: 2640975 (1953-06-01), Roe et al.
patent: 2832950 (1958-04-01), Snyder
patent: 3754219 (1973-08-01), Klein

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