초록 ▼

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 Cr2O3, V2O5 and Na2WO4 in a proportion, by

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 Cr2O3, V2O5 and Na2WO4 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).

대표청구항 ▼

Method of making a relative humidity sensor to measure humidity by change of resistance between electrodes (701, 702) located on a substrate(708) in which a ceramic material is applied between the electrodes, comprising, in accordance with the invention, the steps of homogenizing a mixture of Cr2O3,

Method of making a relative humidity sensor to measure humidity by change of resistance between electrodes (701, 702) located on a substrate(708) in which a ceramic material is applied between the electrodes, comprising, in accordance with the invention, the steps of homogenizing a mixture of Cr2O3, V2O5 and Na2WO4; presintering said homogenized mixture; adding a glass paste to the presintered mixture to form an application paste; applying said application paste on the substrate (708) between said electrodes (701, 702); and sintering the substrate, with the electrodes and the glass-presintered mixture thereon.