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The locally mounted oscillator drives the guard at 16kHz at a constant amplitude. This induces an  identical sinusoidal oscillation on the centre wire  and hence the electrode. As a target comes into the  sensor tip’s range the additional capacitance coupled between the sensor tip and target modifies the electric  field.

This causes a reduction in the amplitude of oscillation of the centre wire/electrode.  Output from the oscillator is a reference oscillation which, when compared with the signal oscillation, gives a difference proportional to the capacitance at the sensor tip.

Other Electronics for Continuous surfaces


The oscillator also contains a differential amplifier into which both the signal oscillation and reference  oscillation are fed. The output from […]

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