Measuring and testing – Gas analysis – Solid content of gas
Patent
1996-07-25
1998-05-26
Williams, Hezron E.
Measuring and testing
Gas analysis
Solid content of gas
73 2331, 73 3102, 204424, 324439, 324691, 428421, 422 90, 422 98, G01N 2700, G01N 0700, C08F28300, B05D 512
Patent
active
057568790
ABSTRACT:
A novel, inexpensive sensor and method for detecting volatile compounds in the gas phase at concentrations of less than about 500 ppm in ambient air are provided. The sensor comprises (a) a dielectric substrate having a major surface; (b) a pair of electrically conductive electrodes disposed on the major surface of the substrate; and (c) a conductive polymer covering the pair of electrically conductive electrodes, with the conductive polymer doped with appropriate dopants in measurable excess of that stoichiometrically required to change the conductive polymer from a neutral state to a charged state to provide requisite conductivity. A method for making the sensor is provided, as is a method of use of the sensor which relates to its use in a monitoring system comprising a means for measuring the conductivity of the sensor connected to a warning means for providing an indication when the conductivity reaches a predetermined level. Contemplated specific methods of use include the detection of fugitive emissions in chemical plant environments; the detection of certain pollutants in vehicle exhaust; and the detection of certain pollutants near chemical handling operations, such as painting operations.
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Miller Leroy J.
Stanford Thomas B.
Van Ast Camille I.
Yamagishi Frederick G.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Electronics
Wiggins J. David
Williams Hezron E.
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