| 摘要 |
PURPOSE:To detect the change of a gap between capacitors with high sensitivity and high accuracy by forming a circuit for easily converting the change of the gap between the capacitors consisting of parallel plates into a voltage proportional to the change of the gap from the change of electrostatic capacity by the change of the gap. CONSTITUTION:A reference capacitor C2 having a fixed electrostatic capacity is connected to a capacitor C1 consisting of parallel plates. A square wave voltage generating circuit is constituted of a diode 7 for applying positive half-wave voltage to the capacitor C1, a diode 8 for applying negative half-wave voltage to the capacitor C2 and resistors R1, R2. In addition, a resistor RL for combining respective voltages of the capacitors C1, C2 is formed to improve the linearity of the gap between the parallel plates and the quantity of electricity. Consequently, the change of the gap is detected as an electric signal proportional to the change and the gap ratio is increased, so that the change of the detected with high sensitivity and high accuracy.
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