Device for effecting dynamic measurement of the distance between

Details Device for effecting dynamic measurement of the distance between Device for effecting dynamic measurement of the distance between

1994-11-17

1996-03-05

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324661, 324686, G01R 2726

Patent

active

054971012

ABSTRACT:
A device for dynamic measurement of the clearance between the tips of rotating blades and the stator of a rotary machine comprises a capacitive sensor polarized by a direct voltage and conditioned by a continuously polarized load amplifier having a high-pass filter structure, preferably of the second order. The construction of the sensor and of the cable connecting it to the conditioning device is coaxial. The calibration of the measuring chain can be performed theoretically, without having recourse to any testing.

REFERENCES:
patent: 4063167 (1977-12-01), Duly
patent: 4292632 (1981-09-01), Yeakley
patent: 4823071 (1989-04-01), Ding et al.
patent: 4876505 (1989-10-01), Osborne
patent: 5101165 (1992-03-01), Rickards
patent: 5119036 (1992-06-01), Rickards et al.
Garimella R. Sarma, et al., "Capacitance-Type Blade-Tip Clearance Measurement System Using a Dual Amplifier with Ramp/DC Inputs and Integration", IEEE Transactions on Instruments and Measurement, vol. 41, No. , Oct. 1992, pp. 674-678.

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