G - Physics
08
B
358/21
G08B 17/10 (2006.01) G01T 1/185 (2006.01) G08B 17/11 (2006.01)
Patent
CA 1134958
ABSTRACT OF THE DISCLOSURE Improvement to fire detectors of the type comprising an ionization chamber having a radioisotope source with an emitting surface turned towards the inside of the chamber and which creates in the atmosphere of the chamber linked with the atmosphere to be monitored a substantially constant ionization, the said source being permanently maintained at a temperature above that in the chamber by the Joule effect using an electrical resistor in such a way as to prevent the condensation of water vapour on the actual source during the sudden temperature variations in a very humid atmosphere, wherein the electrical resistor is placed in contact with the rear non-emitting surface of the source.
335371
Mars Jean
Roux Guy
Commissariat A. L'energie Atomique
Detection Electronique Francaise Protecbat
Goudreau Gage & Associates
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