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Absolute Electrical Property Measurements Using Conformable MWM Eddy-Current Sensors for Quantitative Materials Characterization

Andrew Washabaugh, Vladimir Zilberstein, Darrell Schlicker, Neil Goldfine
JENTEK Sensors, Inc.
200 Dexter Ave., Watertown, MA 02472, USA
Tel: (617) 926-8422
Fax: (617) 926-8744
Email: jentek@shore.net
Contact

Abstract

1. Introduction

2. MWM and Grid Measurement Methods

3. Representative applications

4. Conclusions

5. References

  1. Auld, B.A. and Moulder, J.C. (1999), "Reviews of Advances in Quantitative Eddy Current Non-Destructive Evaluation," Journal of Nondestructive Evaluation, Vol. 18 No.1, 1999.
  2. DeBacker, F., Schoss, V., Baer, L., Maussner G. (1999), "Fatigue Life Time Prediction of Austenitic Stainless Steel Components," presented at the XVI Meeting of the Spain Fracture Mechanics Group, Spain, 1999.
  3. Goldfine, N.J., Clark, D., and Eckhardt H. (1998a), "Meandering Winding Test Circuit," US Patent 5,793,206, Aug. 11, 1998.
  4. Goldfine, N.J., Washabaugh, A., Walrath, K., Zombo, P., and Miller R. (1998b), "Conformable Eddy Current Sensors and Methods for Gas Turbine Inspection and Health Monitoring," ASM Int., Gas Turbine Techn. Conf., Materials Solutions '98, Rosemont, IL.
  5. Goldfine N.J., Schlicker D., and Washabaugh, A. (1998c), "Surface-Mounted Eddy-Current Sensors for On-Line Monitoring of Fatigue Tests and for Aircraft Health Monitoring," Second Joint NASA/FAA/DoD Conference on Aging Aircraft, Aug. 1998.
  6. Goldfine, N.J., and Melcher, J.R. (1995), "Magnetometer Having Periodic Winding Structure and Material Property Estimator," U.S. Patent Number 5,453,689, Sep. 26, 1995.
  7. Melcher, J. R. (1991), "Apparatus and Methods for Measuring Permeability and Conductivity in Materials Using Multiple Wavelength Interrogations," US Patent Number 5,015,951, May 14, 1991.
  8. Yentzer, T., Stillman, B., Fisher, M., Pardue, B., Krafsur, D., and Khaled T. (1999), "Fatigue Life and Residual Stresses in Cold Rolled Propeller Blades," presented at the Third Joint DoD/FAA/NASA Conference on Aging Aircraft, Albuquerque, NM, Sep. 1999.
  9. Yentzer T., Zilberstein V.A., Goldfine, N.J., Schlicker D., and Clark, D. (2000), "Anisotropic Conductivity Measurements for Quality Control of C-130/P-3 Propeller Blades Using MWM Sensors with Grid Methods," presented at the Fourth Joint DoD/ FAA/NASA Conference on Aging Aircraft, May, 2000.

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