Method and vibrating capacitor apparatus for analysis of a subst

Details Method and vibrating capacitor apparatus for analysis of a subst Method and vibrating capacitor apparatus for analysis of a subst

1985-10-15

1987-08-18

Levy, Stewart J.

Measuring and testing

Gas analysis

Gas chromatography

324 61R, 361289, G01N 2722

Patent

active

046868470

ABSTRACT:
One or both plates of a capacitor, caused to vibrate so as to permit measment of the contact potential between the electrodes, is coated with a sensor material for which the electron work function, and therefore the related contact potential, are sensitive to adsorption of a particular substance to be detected and measured in a gas or liquid to be analyzed. Two different materials may respectively be provided on the fixed and movable electrodes of the capacitor, for example nickel and molybdenum for measurement of ammonia content in air. The gas or liquid to be analyzed is introduced into a chamber in which the sensitized vibrating capacitor is located. Different substances can be detected and measured with the same sensor material if the temperature in the chamber is caused to run up or down through a temperature range and if the substances to be detected affect the sensor work function at different temperatures. An electrode carrier can also be subdivided into portions covered with different sensor materials by which different substances can be measured either sequentially or simultaneoulsy. Continuous measurements can be made if the gas or liquid is passed through the chamber.

REFERENCES:
patent: 3031616 (1962-04-01), Hummel
patent: 3039053 (1962-06-01), Jacobson
patent: 3166696 (1965-01-01), Furman
patent: 3189802 (1965-06-01), Zisman
patent: 4100442 (1978-07-01), Besocke
patent: 4387369 (1983-06-01), Klein et al.
patent: 4409509 (1983-10-01), Besocke et al.

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