| 摘要 |
An apparatus for measuring the amount of relative displacement of mutually facing electrodes in such a direction as to cause a change in the distance therebetween, comprises: a power source generating an AC signal of a determined frequency; a phase-shifting means comprising a resistor and the mutually facing electrodes, the phase-shifting means being adapted to apply the AC signal to the mutually facing electrodes through the resistor and to generate an output signal of which the phase is shifted in response to the amount of relative displacement of the mutually facing electrodes; and a phase difference measuring means for measuring phase difference between the output signal of the phase-shifting means and the AC signal and generating a signal corresponding to the amount of relative displacement of the mutually facing electrodes.
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