Chemistry: analytical and immunological testing – Measurement of electrical or magnetic property or thermal... – By means of a solid body in contact with a fluid
Patent
1990-11-05
1991-12-10
Warden, Robert J.
Chemistry: analytical and immunological testing
Measurement of electrical or magnetic property or thermal...
By means of a solid body in contact with a fluid
436149, 422 83, 422 90, 422 98, 204406, 324439, G01N 2700
Patent
active
050717707
ABSTRACT:
A sensor having an interdigitated gate electrode field effect transistor (IGEFET) coupled to an electron beam evaporated copper phthalocyanine thin film is used to selectively detect parts-per-billion concentration levels of atmosphere contaminants such as nitrogen dioxide (NO.sub.2) and diisopropyl methylphosphonate (DIMP). The sensor is excited with a voltage pulse, and its time- and frequency-domain response are examined. The envelopes of the magnitude of the normalized difference frequency spectrums reveal features which unambiguously distinguish the NO.sub.2 and DIMP exposures.
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Collins Laura E.
Hollins Gerald B.
Singer Donald J.
The United States of America as represented by the Secretary of
Warden Robert J.
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