| 摘要 |
Disclosed are a system and method for the accurately calibrated non-contact capacitive measurement of small distances between relatively movable element s. The system and method are particularly well-suited for use in environments o f high temperature, pressure, and vibration, including in jet engines to measu re the gap between fan blades and the engine wall. A sensor disposed in a housi ng wall receives constant bias voltage and forms a sensing capacitor with the moving targets, which move past the sensor. A blocking capacitor allows a signal generated at the sensor to pass to a constant gain amplifier, which amplifies the signal and passes the amplified signal to a computer for calculating the small distances between the relatively movable elements usin g the bias, voltage, the gain, and the maxima and/or minima of the amplified output signal.
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