Smoke detector

Details Smoke detector Smoke detector

G - Physics

01

T

358/21

G01T 1/18 (2006.01) G08B 17/11 (2006.01)

Patent

CA 1095638

35-EL-1363 ABSTRACT OF THE INVENTION A smoke detector is described comprising a smoke detection cell of the ionization type and an electrical network which provides for ac operation of the detection cell. The impedance of the smoke detection cell is very high (40,000 megohms), and the impedance changes in the presence of airborne combustion products. The network senses the impedance change by an ac measurement of the short circuit current through the cell, a tech- nique facilitated by the use of bipolar transistors.

290840

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