In an effort to produce a humidity sensor suitable for automotive applications, an investigation was made of solid state sensors which change electrical impedance as a function of humidity. Physical models are presented which describe operation of the sensors. Measured impedance characteristics of humidity sensors are explained in terms of the following mechanisms: (1) physical adsorption of water vapor, (2) dissociation of water molecules, (3) electrical conduction by means of a Grotthuss chain reaction, (4) electrostatic fields associated with surface-layer complexes, and (5) electrolytic conduction inside capillary pores.


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    Title :

    A Physical Understanding of Solid State Humidity Sensors


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1981



    Publication date :

    1981-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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