Thermionic detector

Details Thermionic detector Thermionic detector

1978-02-28

1980-05-20

Marcus, Michael S.

Chemistry: physical processes

Physical processes

Crystallization

73 23, 73 26, 324468, 422 98, 422 54, G01N 2762

Patent

active

042037263

ABSTRACT:
An instrument for the analysis of a sample material to detect the presence of specific substances that thermally decompose into electronegative species comprises a sensitized surface, means for heating the sensitized surface in a gaseous environment to generate a gaseous boundary layer adjacent the sensitized surface, means for causing the sample material to interact with the sensitized surface to form negative ions, a collector electrode maintainable at a different electrical potential from the sensitized surface to cause a current of these negative ions to the collector electrode, and means for measuring the ion current. The sensitized surface is formed on a ceramic body that is impregnated with an alkali metal. The composition and temperature of the sensitized surface, and the composition of the gaseous boundary layer are selected according to the specific substance to be detected.

REFERENCES:
patent: 3372994 (1968-03-01), Giuffrida
patent: 3423181 (1969-01-01), Dimick et al.
patent: 3439262 (1969-04-01), Roberts
patent: 3540851 (1970-11-01), Vree et al.
patent: 3547588 (1970-12-01), Miyamoto et al.
patent: 3589869 (1971-06-01), Scolnick
patent: 3795716 (1957-06-01), Roberts
patent: 3852037 (1974-12-01), Kolb et al.
patent: 3925023 (1975-12-01), Kaiser
patent: 4047101 (1977-09-01), Baurle et al.

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