Gas sensor

Details Gas sensor Gas sensor

1988-04-05

1989-12-19

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

324 65R, G01N 2702

Patent

active

048874558

ABSTRACT:
A gas sensor has a layer of a semiconductor organic polymer, such as polypyrrole which is exposed to a gas to be detected. An alternating electric signal of varying frequency is applied to the sensor by an analyser, which detects the change in impedance characteristics of the sensor. The characteristics obtained are compared by microcomputer with reference characterisitcs stored in a memory. The resulting difference spectra depend on the gas in contact with the sensor and so the gas can be detected.

REFERENCES:
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patent: 4103227 (1978-07-01), Zemel
patent: 4140990 (1979-02-01), DeWarren
patent: 4453126 (1984-06-01), Volgyesi
patent: 4674319 (1987-06-01), Muller
patent: 4681855 (1987-07-01), Huang
patent: 4721601 (1988-01-01), Wrighton et al.
T. Maruizumi et al., "A.C. Impedance Study on Chloride Ion Sensitive Polymeric Membranes", undated.
El Kadiri et al., "Frequency and Temperature-Dependent Complex Conductivity of Some Conducting Polymers", undated.
Yuequiang et al., "Structure and Conductivity of Some Heavily Doped Polypyrroles", undated.

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