The proximity probe is a displacement transducer. It consists of a small coil of wire around a metal rod, which is connected to a special preamplifier. The voltage output of the preamplifier is proportional to the displacement between the end of the probe and a conducting surface. The response of the system is from DC, i.e. it measures static displacement, and dynamic displacement up to about 1000 Hz. Proximity probes are used extensively in instrumenting sleeve bearings, where they measure the thickness of the oil film and can detect oil whirl and other bearing defects. They are also sometimes called eddy current probes.
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