Gas and humidity sensing element

Details Gas and humidity sensing element Gas and humidity sensing element

1983-03-16

1984-06-26

Kaplan, G. L.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

338 35, 204412, 204426, H01L 700, G01N 2746

Patent

active

044569025

ABSTRACT:
A gas and humidity sensing element in a single integral structure made of a base plate of apatite ceramics, on which a particular metal oxide such as tin oxide, zinc oxide, or composite oxide of titanium and niobium is provided. The sensing element has a function of sensing gas and humidity with outstanding sensitivity to bad smell gas and alcoholic gas, in which the humidity is sensed and measured by variations in electrical resistance of the apatite ceramic base plate and the bad smell gas such as hydrogen sulfide, methyl mercaptan, etc. is sensed and measured by variations in electrical resistance of the metal oxide.

REFERENCES:
patent: 3705375 (1972-12-01), Hershler
patent: 4015230 (1977-03-01), Nitta et al.
patent: 4052691 (1977-10-01), Nagano et al.
patent: 4328478 (1982-05-01), Murata et al.
patent: 4359709 (1982-11-01), Nakatani et al.
Journal of Electronic Materials, vol. 10, No. 3, 1981, R. B. Cooper et al., "Gas Sensing Mechanisms in SnO.sub.2 Thin Films".

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