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Capacitive proximity effect?

Discussion in 'Electronic Basics' started by Don A. Gilmore, Sep 23, 2004.

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  1. Hi guys:

    I'm interested in how a capacitive sensor works, in general. I have a vauge
    idea that the face of the sensor is theoretically like one plate of a
    capacitor and that a high-frequency signal is applied to it somehow and that
    an object that comes near the sensing face will change the dielectric and
    cause a fluctuation of *something*, but I don't know anything more specific
    than that.

    Could someone point me in the direction of a website or book that explains
    this phenomenon with some explanatory schematics? Or maybe one of you
    bright fellas can enlighten me.

    Thanks for any help you can provide.

    Don A. Gilmore
    Mechanical Engineer
    Kansas City, Mo.
     
  2. The theory is a bit thin, but the pictures are nice:
    http://www.enm.com/training/siemenscourses/snrs_3.pdf

    Another rather weak reference:
    http://www.ab.com/sensors/sensorstoday/pdfs/FSM-900-2.pdf
     
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