G - Physics – 01 – N
Patent
G - Physics
01
N
73/69
G01N 27/00 (2006.01)
Patent
CA 1251654
ABSTRACT OF THE DISCLOSURE One of two plates of a capacitor, is caused to vibrate so as to permit measurement of the contact potential between the electrodes. One or both plates are coated with a sensor material for which the electron work function, and therefore the related contact potential, is 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 for the fixed and movable electrodes of the capacitor for measure- ment of various substances. The gas or liquid to be analyzed is introduced into a chamber in which the sensitized vibratory capa- citor is located. Different substances can be detected and measured with the same sensor material if the temperature in the chamber is caused to vary through a temperature range and if the substances to be detected affect the sensor's electron 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 simultaneously. Continuous measurements can be made if the gas or liquid is passed through the chamber.
493343
Kernforschungsanlage Julich Gesellschaft Mit Beschrankter Haftun
Smart & Biggar
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