Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device
Patent
1978-10-05
1980-10-07
Smith, Alfred E.
Radiant energy
Invisible radiant energy responsive electric signalling
Including a radiant energy responsive gas discharge device
250385, G01T 118
Patent
active
042270855
ABSTRACT:
An ionization-type particle detector having an insulating base which mounts an inner electrode provided with a source of ionizing radiation which directs a generally conical beam perpendicularly away from the base; an intermediate cylindrical electrode symmetrically disposed around the inner electrode which has an open upper end through which the radiation beam exists from a compensation zone defined by the inner and intermediate electrodes; and an outer cup-shaped electrode symmetrically disposed about the intermediate electrode and which defines therewith a sensing zone into which radiation enters from the top opening in the intermediate electrode. The sensing zone is divided by the envelope of the radiation beam into an upper bipolar region and a lower unipolar region. The height and diameter of the intermediate electrode is selected relative to that of the outer electrode such that a decrease in ionization current between the intermediate and outer electrodes in the presence of smoke is attributable approximately 75% to a decrease in ionization flowing in the unipolar zone and approximately 25% to a decrease of current flowing in the bipolar zone. Slots in the outer electrode are configured such that air enters tangentially to avoid turbulence. The slots do not extend below a point equal to approximately the height of the intermediate electrode thereby blocking substantially the entirety of the compensation zone and approximately 50% of the unipolar region of the sensing zone from direct air flow paths via the slots. Full and partial blocking of the type described coupled with tangential air introduction enhances the insensitivity of the detector to variations in environmental air velocity.
REFERENCES:
patent: 3935466 (1976-01-01), Tomioka
patent: 4150373 (1979-04-01), Ried, Jr.
Electrometer Corporation
Howell Janice A.
Smith Alfred E.
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