Eddy current clearance transducing system

Electricity: measuring and testing – Magnetic – Displacement

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Details

73660, 324226, G01N 2772, G01N 2900, G01B 714, G01R 3300

Patent

active

048475564

ABSTRACT:
A system combining a transducer and a signal processing circuit measures the clearance distance from the transducer to an electrically conductive moving part of a machine. The transducer contains a magnet and a coil, both coupled magnetically to a region traversed by the machine part. Eddy currents are induced in the part as it passes through the magnetic field of the transducer. These currents produce a field which moves with the part and generates a characteristic signal in the transducer coil. Amplitude and timing attributes of the signal are measured by the signal processing circuit. An experimentally derived mathematical function which relates the amplitude and timing of this signal to the clearance distance between the transducer and the moving part is used to compute the clearance distance. During this calculation useful information is also developed about the speed and transit time of the moving part. The system is adapted to turbomachinery blade condition monitoring.

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O'Brien et al., "Non Contacting Method for Measurement of Dynamic Blade Motions in Axial-Flow Compressors", ISA 1981.

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