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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Auld, B. A., and Moulder, J. C., 1999. “Review of Advances in Quantitative Eddy Current Nondestructive Evaluation,” J. Nondestruct. Eval., 18 (1).
Goldfine,  N. J., 1993, “Magnetometers for Improved Materials Characterization in Aerospace Applications,” Mater. Eval., Mar. , pp. 396–404.
Goldfine, N. J., Lovett, J. T., and Sheiretov, Y., 1995, “Dielectrometers and Magnetometers, Suitable for in-situ Inspection of Ceramic and Metallic Coated Components,” SPIE Conference on Nondestructive Evaluation of Aging Infrastructure.
Miller, R. A., 2000, private communication.
Goldfine, N. J., Zombo, P. J., and Miller, R. A., 1999, gas turbine materials.
Goldfine, N., Washabaugh, A., Walrath, K., Zombo, P., and Miller, R. 1998, “Conformable Eddy Current Sensors and Methods for Gas Turbine Inspection and Health Monitoring,” Gas Turbine Materials Technology, Proc. ASM International Gas Turbine Technology Conference, ASM International, Materials Park, OH.
Goldfine, N. J., and Zombo, P. J., 1994, “Combustion Turbine Blade Coating Characterization Using a Meandering Winding Magnetometer,” Fall 1994 American Society of NDT Conference.
Radavich, J. F., and Korth, G. E., 1992, “High-Temperature Degradation of Alloy 718 After Longtime Exposures,” Superalloys 1992, S. D. Antolovich et al., eds., Minerals, Metals, & Materials Society, pp. 497–506.
Goldfine,  N., Sheiretov,  Y., Washabaugh,  A., and Zilberstein,  V., 2000, “Materials Characterization and Flaw Detection for Metallic Coating Repairs,” Insight, 42(12), pp. 809–814.
performance demonstration protocol for round robin testing of combustion turbine blade coatings, 2000, EPRI NDT Center.


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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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