Methods and apparatus for measuring rotating machine clearances

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

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Reexamination Certificate

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06949939

ABSTRACT:
A method of monitoring a clearance distance between a rotatable member and a stationary member within a rotary machine is provided. The method includes exciting a probe with a first modulation signal when the rotatable member is rotating at less than or equal to a predetermined rate, exciting the probe with a second modulation signal when the rotatable member is rotating at greater than the predetermined rate, measuring the clearance distance between the rotatable member and the stationary member using the probe excited with at least one of the first modulation signal and the second modulation signal.

REFERENCES:
patent: 4069662 (1978-01-01), Redinger et al.
patent: 4384819 (1983-05-01), Baker
patent: 4806848 (1989-02-01), Demers
patent: 5101165 (1992-03-01), Rickards
patent: 5119036 (1992-06-01), Rickards et al.
patent: 5148126 (1992-09-01), Spencer
patent: 5166626 (1992-11-01), Hester et al.
patent: 6054866 (2000-04-01), Mansfield

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