Humidity sensor, sensor material, method of manufacture and humi

Details Humidity sensor, sensor material, method of manufacture and humi Humidity sensor, sensor material, method of manufacture and humi

1987-03-20

1988-12-27

Levy, Stuart S.

Measuring and testing

Moisture content or absorption characteristic of material

733365, 252963, G01N 1910

Patent

active

047931752

ABSTRACT:
An ion conductive sensor is connected to a current source which, in order to prevent polarization effects, controls current flow through the sensor in spaced or polarity-alternating pulses. If the sensor is a humidity sensor, it is preferably constituted by Cr.sub.2 O.sub.3, V.sub.2 O.sub.5 and Na.sub.2 WO.sub.4 in a proportion, by weight, of preferably 2 to 2.5:1:1, sintered on a substrate which has comb electrodes applied thereto. The sensor is especially immune to noise or disturbance pulses from the current supply and is especially suitable for use as an ambient humidity sensor in an automotive vehicle (810).

REFERENCES:
patent: 4041437 (1977-08-01), Matsuura et al.
patent: 4080564 (1978-03-01), Nitta et al.
patent: 4119909 (1978-10-01), DeBerry
patent: 4142148 (1979-02-01), Johansson
patent: 4464647 (1984-08-01), Yokomizo et al.
patent: 4497701 (1985-02-01), Murata et al.
patent: 4546916 (1985-10-01), Tsuaki
patent: 4642601 (1987-02-01), Sugawara et al.

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