Phase discrimination in modulated thermal conductivity detector

Details Phase discrimination in modulated thermal conductivity detector Phase discrimination in modulated thermal conductivity detector

1978-10-06

1980-01-29

Kreitman, Stephen A.

Measuring and testing

Gas analysis

Gas chromatography

73 27R, G01N 3108

Patent

active

041854900

ABSTRACT:
A thermal conductivity detector in which sample gas and reference gas are made to alternately flow through a thermal conductive cell at a given switching frequency and in which the output signal is applied to a synchronous detector wherein it is mixed with a control wave that is in phase quadrature with the flow component of the output signal.

REFERENCES:
patent: 2255551 (1941-09-01), Willenborg
patent: 3967492 (1976-07-01), Allington
patent: 4140396 (1979-02-01), Allington

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