Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1989-07-05
1990-10-30
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420726, 73660, 340683, 364550, G01P 348, G01P 354, G01B 714, G01M 100
Patent
active
049671537
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.
REFERENCES:
patent: 3058339 (1962-10-01), Shapiro
patent: 3065412 (1962-11-01), Rosenthal
patent: 3467358 (1969-09-01), Zablotsky et al.
patent: 3530323 (1970-07-01), Applequist
patent: 3896608 (1975-07-01), Garrett
patent: 3932813 (1976-11-01), Gallant
patent: 4153388 (1979-05-01), Naegeli et al.
patent: 4326804 (1982-04-01), Massey
patent: 4439228 (1984-03-01), Rickman, Jr.
patent: 4518917 (1985-05-01), Oates et al.
O'Brien et al, "Non-Contacting Method for Measurement of Dynamic Blade Motions in Axial-Flow Compressors", ISA 1981, pp. 279-291.
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