Thermionic detector with multiple layered ionization source

Details Thermionic detector with multiple layered ionization source Thermionic detector with multiple layered ionization source

1983-03-02

1985-06-18

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

324468, 422 54, 436153, G01N 2762

Patent

active

045240477

ABSTRACT:
Method and apparatus for analyzing specific chemical substances in a gaseous environment comprises a thermionic source formed of multiple layers of ceramic material composition, an electrical current instrumentality for heating the thermionic source to operating temperatures in the range of 100.degree. C. to 1000.degree. C., an instrumentality for exposing the surface of the thermionic source to contact with the specific chemical substances for the purpose of forming gas phase ionization of the substances by a process of electrical charge emission from the surface, a collector electrode disposed adjacent to the thermionic source, an instrumentality for biasing the thermionic source at an electrical potential which causes the gas phase ions to move toward the collector, and an instrumentality for measuring the ion current arriving at the collector. The thermionic source is constructed of a metallic heater element molded inside a sub-layer of hardened ceramic cement material impregnated with a metallic compound additive which is non-corrosive to the heater element during operation. The sub-layer is further covered by a surface-layer formed of hardened ceramic cement material impregnated with an alkali metal compound in a manner that eliminates corrosive contact of the alkali compounds with the heater element. The sub-layer further protects the heater element. The sub-layer further protects the heater element from contact with gas environments which may be corrosive. The specific ionization of different chemical substances is varied over a wide range by changing the composition and temperature of the thermionic source, and by changing the composition of the gas environment.

REFERENCES:
patent: 2550498 (1951-04-01), Rice
patent: 2795716 (1957-06-01), Roberts
patent: 3852037 (1974-12-01), Kolb et al.
patent: 4203726 (1980-05-01), Patterson
Patterson et al.; An Improved Thermionic Ionization Detector for Gas Chromatography; J. of Chromatographic Science, vol. 20, Mar. '82, pp. 97-102.
Burgette et al., Journal of Chromatography, vol. 134, pp. 57-64 (1977).
Patterson, Journal of Chromatography, vol. 167, pp. 381-397 (1978).
Blewett, Physical Review, vol. 50, pp. 464-468 (1936).

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