Thermal conductivity cell

Details Thermal conductivity cell Thermal conductivity cell

1992-03-06

1993-08-03

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324450, 204406, 73 2503, G01N 2518

Patent

active

052333086

ABSTRACT:
A thermal conductivity cell in the form of a bridge is used as one of the resistors in a Wheatstone bridge network. The output of the thermal conductivity cell is applied to the input of a low noise amplifier, the output of which is differentiated by an R-C coupling network having a time constant selected to pass a substantial portion of the output signal from the thermal conductivity cell with minimum attentuation. The R-C differentiating coupling network effectively reduces DC errors due to drift and offset and shapes the output signal improving the signal-to-noise ratio enabling trace amounts of materials to be analyzed.

REFERENCES:
patent: 2926520 (1960-03-01), Schmauch
patent: 3512080 (1970-05-01), Hanson
patent: 3683671 (1972-08-01), Van Swaay
patent: 4164862 (1979-08-01), Jackson
patent: 4384934 (1983-05-01), de Bruin et al.
patent: 4461166 (1984-07-01), Gatten et al.
patent: 4594879 (1986-06-01), Maeda et al.
patent: 4741198 (1988-05-01), Farren et al.
patent: 4918974 (1990-04-01), Hachey et al.

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