Measuring and testing – Gas analysis – Detector detail
Patent
1998-01-13
1999-09-28
Wiggins, J. David
Measuring and testing
Gas analysis
Detector detail
73 5301, 73 6141, 73 2334, 422 681, 422 90, 324693, G01N 3300, G01N 2726, G01N 2712, B32B 0500
Patent
active
059591919
ABSTRACT:
Chemical sensors for detecting analytes in fluids comprise first and second conductive elements (e.g. electrical leads) electrically coupled to and separated by a chemically sensitive resistor which provides an electrical path between the conductive elements. The resistor comprises a plurality of alternating nonconductive regions (comprising a nonconductive organic polymer) and conductive regions (comprising a conductive material) transverse to the electrical path. The resistor provides a difference in resistance between the conductive elements when contacted with a fluid comprising a chemical analyte at a first concentration, than when contacted with a fluid comprising the chemical analyte at a second different concentration. Arrays of such sensors are constructed with at least two sensors having different chemically sensitive resistors providing dissimilar such differences in resistance. Variability in chemical sensitivity from sensor to sensor is provided by qualitatively or quantitatively varying the composition of the conductive and/or nonconductive regions. An electronic nose for detecting an analyte in a fluid may be constructed by using such arrays in conjunction with an electrical measuring device electrically connected to the conductive elements of each sensor.
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Freund Michael S.
Lewis Nathan S.
California Institute of Technology
Wiggins J. David
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