04776944 is referenced by 345 patents and cites 7 patents.

A chemical selective sensor system utilizes admittance modulated to detect the presence of chemicals or chemical species in a fluid. The sensor system includes a film or membrane adapted to pass ions when selected chemicals which are to be detected are present at the membrane surface. The membrane is attached to a hydrophilic layer of material which, in turn, is attached to a transformed layer which is deposited on a base substrate. When the selected chamicals are present in the fluid, the membrane interacts with the chemicals to allow ions, also in the fluid, to permeate the membrane. This ion current in the membrane is transformed or converted by the transformer layer to an electronic current which is measured by an electrical circuit coupled to the transformer layer of material. An alternating current source is coupled at one terminal to the transformer layer and to the measuring circuit, and at another terminal to a circuit return electrode.

Title
Chemical selective sensors utilizing admittance modulated membranes
Application Number
841872
Publication Number
4776944
Application Date
September 1, 1987
Publication Date
October 11, 1988
Inventor
Michael Thompson
3642 S. 2500 E., Salt Lake City, 84109
UT, US
Robert J Huber
1145 E. Millbrook Way, Bountiful, 84010
UT, US
Jiri Janata
2231 Logan Ave., Salt Lake City, 84108
UT, US
Agent
Thorpe North & Western
IPC
G01N 27/30
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