Electrical resistors – Resistance value responsive to a condition – Gas – vapor – or moisture absorbing or collecting
Patent
1988-10-11
1991-07-02
Silverberg, Sam
Electrical resistors
Resistance value responsive to a condition
Gas, vapor, or moisture absorbing or collecting
733365, G01W 100
Patent
active
050289063
ABSTRACT:
This invention concerns a humidity sensor wherein a chemical conversion coating, giving attention to the property that it undergoes an impedance decrease with adsorption of moisture, is used as humidity sensing element which is characterizied by an extremely short electrode distance, greatly improved sensitivity, high speed response, stable performance over a long period of time, high reliability and cheaper production cost.
The principal point that characterizes the humidity sensor in this invention is that the chemical conversion coating deposited on the metal surface with or without an electrolysis application, is made usable as a humidity sensing element. For the chemical conversion coating, such coatings as phosphate, oxalate, titanium fluoro-complex, chromium phosphate and non-chromium types are used.
On top of this chemical conversion coating, application of a humidity sensing film is effected to further improve humidity sensing performance.
REFERENCES:
patent: 3523244 (1970-08-01), Goodman
patent: 4052691 (1977-10-01), Nagano
patent: 4343688 (1982-08-01), Harwood
patent: 4419889 (1983-12-01), Misto
patent: 4497701 (1985-02-01), Murata
patent: 4562725 (1986-01-01), Oka
Imai Yasuo
Ishikura Kazuhiro
Kojima Ryuji
Matsushima Yasunobu
Moriya Yoshio
Nihon Parkerizing Co. Ltd.
Silverberg Sam
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