Multi-functional sensor

Details Multi-functional sensor Multi-functional sensor

1981-01-28

1983-04-05

Birmiel, Howard A.

Measuring and testing

Gas analysis

By vibration

73 29, 338 34, 338 35, 422 98, G01N 2712, G01N 3106

Patent

active

043786910

ABSTRACT:
A multi-functional sensor capable of sensing the humidity and the concentration of reducing gases in the surrounding atmosphere with a single sensing element of p-type metal-oxide ceramic semiconductor is provided. When the ambient temperature is lower than 150.degree. C., the sensor can detect humidity in terms of variations in ion conduction due to the physical absorption of water by the sensing element, but when the ambient temperature or the temperature of the sensing element is at temperatures between 200.degree. and 600.degree. C., the sensor can detect the presence or concentration of reducing gases in the surrounding atmosphere in terms of variations in electron conduction due to the chemical absorption of gases by the sensing element.

REFERENCES:
patent: 3906473 (1975-09-01), Le Vine
patent: 4012692 (1977-03-01), Eicker
patent: 4067655 (1977-01-01), Miyaguchi
patent: 4086556 (1978-04-01), Nitta et al.
patent: 4244918 (1981-01-01), Yasuda et al.

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