Pulse modulated thermal conductivity detector

Details Pulse modulated thermal conductivity detector Pulse modulated thermal conductivity detector

1986-07-14

1988-04-05

Levy, Stewart J.

Measuring and testing

Gas analysis

By vibration

G01N 2518

Patent

active

047350822

ABSTRACT:
A thermal conductivity detector comprised of a Wheatstone bridge having a filament in one arm thereof that is contained within a cavity through which the elutant from a column is passed and means for deriving an output signal from one diagonal of the bridge when the voltage applied across the other diagonal is changed from a small value to a large value. In one embodiment, the voltage applied across the one diagonal of the bridge is changed from a fixed low value to a fixed high value and the output signal is the change in the voltage appearing across the other diagonal. In another embodiment, the voltage applied across the one diagonal of the bridge varies from a low value to a value required to keep the bridge in balance, and the difference between these voltages is the output signal.

REFERENCES:
patent: 3913379 (1975-10-01), Rusz et al.
patent: 4063447 (1977-12-01), Mathison
patent: 4123934 (1978-11-01), Hoht
patent: 4164862 (1979-08-01), Jackson
patent: 4254654 (1981-03-01), Clouser et al.
patent: 4461166 (1984-07-01), Gatten et al.

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