Miniaturized thermal conductivity detector

Details Miniaturized thermal conductivity detector Miniaturized thermal conductivity detector

1979-02-06

1980-08-05

Goldstein, Herbert

Measuring and testing

Gas analysis

By vibration

G01N 2500

Patent

active

042155649

ABSTRACT:
A hot wire miniaturized thermal conductivity detector with a cavity volume less than 50 microliters characterized by a construction which provides for essentially plug flow through a cylindrical cavity. The gas flows tangentially into and out of toroidal passageways presented between axial filament mounts and the cylindrical cell wall so that the gas flow-passage area increases by stages as the gas flows from an inlet into the detector cavity first through the toroidal passageways therein then through the main body thereof. Correspondingly the flow path decreases by stages from the main body into the toroidal passageway then into the outlet.
Preferably the passage area increase from inlet to main body is held to less than a five fold increase in area.

REFERENCES:
patent: 2306509 (1942-12-01), Talmey
patent: 3621707 (1971-11-01), Kolloff et al.
patent: 3791195 (1974-02-01), Loe

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