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Capacitive proximity sensors 'break the rules'

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The standard capacitive switch has electrodes arranged in the sensor head that form a measurement capacity The field mainly of spherical or semi spherical nature is influenced by the proximity of material with a dielectric constant >1. This alteration of capacity is converted to a signal that can be evaluated, by a special oscillator circuit.

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Computing & Control Engineering Journal  (Volume:15 ,  Issue: 6 )