Ionization chamber for smoke detector and the like

Details Ionization chamber for smoke detector and the like Ionization chamber for smoke detector and the like

G - Physics

08

B

358/21

G08B 17/10 (2006.01) G01N 27/64 (2006.01) G08B 17/113 (2006.01)

Patent

CA 1186817

ABSTRACT An ionization smoke detector is disclosed in which an electric field is established in an ionization chamber which includes an outer cup-shaped elec- trode defining the chamber and having side wall apertures for permitting airflow therethrough and a circular inner electrode within the chamber . A radiation source is arranged to produce bipolar and unipolar regions in the chamber . A cylindrical control screen coaxial with the outer electrode and spaced therefrom is electrically connected to and supported by the inner electrode in the chamber .

410620

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