Capacitive gas detector having a solid rare earth fluoride diele

Details Capacitive gas detector having a solid rare earth fluoride diele Capacitive gas detector having a solid rare earth fluoride diele

1988-11-08

1989-09-05

Griffin, Donald A.

Electricity: electrical systems and devices

Electrostatic capacitors

Variable

361525, 324 61R, 338 34, H01G 700, G01N 2712, H01L 700

Patent

active

048644625

ABSTRACT:
Gas species are detected with a capacitor having a solid, ionic dielectric excited by an AC voltage in the ramp 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 impedance 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 absorption 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:
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Bard et al, "Electrochemical Methods", New York, 1980, pp. 316-369.

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