Blade tip clearance measuring apparatus

Details Blade tip clearance measuring apparatus Blade tip clearance measuring apparatus

1976-06-07

1977-12-13

Rolinec, Rudolph V.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

73462, G01R 2726

Patent

active

040631672

ABSTRACT:
Apparatus is disclosed for the noncontact measurement of the clearance between the blade tips of a rotating turbine and the surrounding housing. Blade tip clearance is measured by placing a capacitance probe in the housing wall. The probe consists of two metallic conductors insulated one from the other and arranged to form the plates of a capacitor. Passing of a blade tip in close proximity to the two plates of the probe changes its capacitance. Electronic circuitry measures the change in capacitance and hence the clearance between blade tip and probe. Use of a balanced type input avoids the need for a ground return path and enables the use of a long sensor cable without degradation of results.

REFERENCES:
patent: 3401383 (1968-09-01), Ault
patent: 3488581 (1970-01-01), Foster
patent: 3504279 (1970-03-01), Foster et al.
patent: 3714561 (1973-01-01), Jaquay
"Capacitive Transducers" Foldvari et al., Instruments & Control Systems, Nov. 1964, vol. 37, pp. 77-84.

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