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TECHNICAL PAPERS: Gas Turbines: Industrial and Cogeneration

Conformable Eddy-Current Sensors and Arrays for Fleetwide Gas Turbine Component Quality Assessment

[+] Author and Article Information
N. Goldfine, D. Schlicker, Y. Sheiretov, A. Washabaugh, V. Zilberstein, T. Lovett

JENTEK Sensors, Inc., 110-1 Clematis Avenue, Waltham, MA 02453-7013e-mail: jentek@shore.net

J. Eng. Gas Turbines Power 124(4), 904-909 (Sep 24, 2002) (6 pages) doi:10.1115/1.1477196 History: Received December 01, 2000; Revised March 01, 2001; Online September 24, 2002
Copyright © 2002 by ASME
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References

Figures

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(a) Single-sensing element MWM sensor, (b) MWM-array, and (c) tapered MWM-array
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Coating thickness—liftoff grid lattices for MCrAlY coating family
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MWM results for MCrAlY on IN 738; (a) multiple-frequency MWM effective conductivity data for different coating thicknesses, (b) MWM metallic bond coat thickness results compared to metallography thickness and requested thickness (ideal). The samples were provided by Innogy Ltd.
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Schematic representation of a degraded MCrAlY coating
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MWM multiple-frequency measurements for both sides of blind test samples
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Representative conductivity/liftoff measurement grids used for characterization of the coated samples in the EPRI round robin. These grids assume a uniform conductivity, i.e., no coating.
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(a) Comparison of the MWM multifrequency effective conductivity measurements for training set and blind test samples on one side of each sample without a shim, (b) MWM measured beta-phase layer thickness versus reported beta-phase layer thickness for blind test set
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MWM measured and reported nominal alpha case thickness over the stair-step cast sample
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Multiple-frequency measurements of shot-peened aluminum components. The indicated Almen intensities are given in scale A.
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Estimated effective thickness of the shot peen process-affected zone versus Almen intensity

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