Gas detection method and apparatus using chemisorption and/or ph

Details Gas detection method and apparatus using chemisorption and/or ph Gas detection method and apparatus using chemisorption and/or ph

1986-06-30

1989-01-03

Niebling, John F.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 65R, 324 711, 338 34, 338 35, 204 1T, G01R 2726, G01R 2702

Patent

active

047959681

ABSTRACT:
Gas species are detected with a capacitor having a solid, ionic dielectric excited by an AC voltage in the range from 0.01-30 Hz, with an amplitude of 1-100 millivolts to allow physisorption processes and/or with an AC voltage in the same frequency range and amplitudes from 0.01-3 volts to achieve chemisorption reactions. The AC impedancae of the capacitor is detected for both physisorption and chemisorption excitation to determine gas species and concentration. In chemisorption, diode like action occurs, and is detected by AC harmonic detection processes. The surface of the dielectric on which the gas is incident is overlaid with a grid or porous electrode, fabricated of inert metal or a catalyst which causes the capacitor to enable preferential adsorption by the dielectric of certain materials, to indicate the presence of certain gases. Plural capacitors, having different adsorption characteristics in response to different gases facilitates detection of plural gases. The dielectric is a rare earth fluoride, preferably lanthanum fluoride. The AC impedance of the capacitor provides the specie and concentration indications.

REFERENCES:
patent: 3719564 (1971-05-01), Lilly et al.
patent: 4025892 (1977-05-01), Pompei et al.
patent: 4039941 (1977-08-01), Morrison
patent: 4190990 (1979-02-01), Pompei kato de Warrens
patent: 4314996 (1982-02-01), Sekido et al.
patent: 4482581 (1984-11-01), Lorin et al.
patent: 4580439 (1986-04-01), Manaka
patent: 4594869 (1986-06-01), Fukushiria et al.
Bard et al, "Electrochemical Methods", New York, 1980, pp. 316-369.

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