Humidity sensor

Details Humidity sensor Humidity sensor

1982-12-01

1984-07-31

Barr, Josephine

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252521, 338 35, 29610R, 73 73, 733365, H01B 106

Patent

active

044629303

ABSTRACT:
A humidity sensor formed of a sintered compact consisting essentially of material substantially of a spinel structure represented by the formula: M.sub.1-x A.sub.x Fe.sub.2 O.sub.4-.alpha. where M stands for magnesium or zinc, A stands for an alkali metal, x is the numerical value in the range of 0.001 to 0.2, and .alpha. is the number of oxygen vacancies. The humidity sensor is highly sensitive over a wide relative humidity range, withstands a long use and presents almost no hysteresis in its humidity-resistance characteristics.

REFERENCES:
patent: 3503902 (1970-03-01), Shimoda
patent: 3926858 (1975-12-01), Ichinose et al.
patent: 4015230 (1977-03-01), Nitta et al.
patent: 4050048 (1977-09-01), Frazee
patent: 4052691 (1977-10-01), Nagano et al.
patent: 4086556 (1978-04-01), Nitta et al.
patent: 4321577 (1982-03-01), Carlson
patent: 4344062 (1982-08-01), Sudoh et al.
patent: 4357426 (1982-11-01), Murata et al.
patent: 4373391 (1983-02-01), Johnson

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