Ionization type smoke sensor

Details Ionization type smoke sensor Ionization type smoke sensor

1975-04-17

1977-04-12

Borchelt, Archie R.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, G01T 118, H01J 3928

Patent

active

040177335

ABSTRACT:
In a smoke sensor of the ionization type having as essential component parts an opposing pair of electrodes providing for high impedance effected by ionic current produced by a radioactive ray source, improvements are made to eliminate formation of dew at least on the surface of the radioactive ray source and also prevent the high impedance from being accidentally changed due to a cause other than smoke, for instance a comparatively intense air stream which may otherwise cause a casual change of the high impedance.

REFERENCES:
patent: 3448261 (1969-06-01), Amiragoff
patent: 3767917 (1973-10-01), Lampart et al.

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