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Title: Humidity sensor
Abstract:
This invention provides a humidity sensor having a negative coefficient of resistivity for relative humidity, which comprises 99.99 to 10 mole percent of iron oxide (Fe.sub.2 O.sub.3) and 0.01 to 90 mole percent of at least one member selected from alkali metal oxides, which are lithium oxide (Li.sub.2 O), sodium oxide (Na.sub.2 O), potassium oxide (K.sub.2 O) and cesium oxide (Cs.sub.2 O). The amount of the alkali metal oxide in the sensor is preferably 0.01 to 25 mole percent. This sensor is advantageous because it can accurately detect the changes in humidity and it has a long, stable life.
Other info: Inventors: Matsuura, Mikio (Hirakata, JA) Nishi, Nobuji (Hirakata, JA) Yamaguchi, Masatsugu (Hirakata, JA) Matsuoka, Michio (Ibaragi, JA) Masuyama, Takeshi (Takatsuki, JA) Application Number: 644414 Filing Date: 1975-12-24 Publication_date: 1977-08-09 Assignee: Matsushita Electric Industrial Co., Ltd. (JA) Primary Class(es): 338/35 73/29.05, 73/73, 73/335.05, 252/194, 252/963, 422/98, 436/39, 436/149, 436/151 Other Classes: US Patent Ref:
Other Refs: Other References: Chemical Abstracts, vol. 70, (1969) No. 61495g. Shibata et al., Bulletin of the Chem. Soc. of Japan, vol. 42, 1969, pp. 871-874. | |