Turbine blade clearance on-line measurement system

Details Turbine blade clearance on-line measurement system Turbine blade clearance on-line measurement system

2005-09-27

2005-09-27

Ledynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S207140

Reexamination Certificate

active

06949922

ABSTRACT:
A system (90) for measuring the gap (16) between a rotating blade (14) and a stationary component (12) of a turbo-machine, including an eddy current coil (30) and an eddy current tester (91). The eddy current tester may excite the coil in a pulsed eddy current testing mode. The coil is positioned in a stationary portion (12) of a turbo-machine traversed by a rotating blade and the eddy current tester is coupled to the eddy current coil to provide an indication responsive to a distance between the blade and the stationary portion as the blade traverses the position. The coil may be mounted in a frangible ceramic pill (70) movably disposed in a housing (74). The coil is positioned near the turbine blade, the coil is excited with a voltage step function (120), and the response (122) of the coil to the step function is detected and processed to determine the proximity of the blade.

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