Eddy current sensor with concentric segments

Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material

Reexamination Certificate

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C324S202000, C324S239000, C324S242000

Reexamination Certificate

active

07994781

ABSTRACT:
Reference standards or articles having prescribed levels of damage are fabricated by monitoring an electrical property of the article material, mechanically loading the article, and removing the load when a change in electrical properties indicates a prescribed level of damage. The electrical property is measured with an electromagnetic sensor, such as a flexible eddy current sensor, attached to a material surface, which may be between layers of the article material. The damage may be in the form of a fatigue crack or a change in the mechanical stress underneath the sensor. The shape of the article material may be adjusted to concentrate the stress so that the damage initiates under the sensor. Examples adjustments to the article shape include the use of dogbone geometries with thin center sections, reinforcement ribs on the edges of the article, and radius cut-outs in the vicinity of the thin section. A test circuit includes sensing elements between concentric circular segments of the primary winding and located every other half wavelength of the primary winding.

REFERENCES:
patent: 3696290 (1972-10-01), Dreckmann et al.
patent: 4095180 (1978-06-01), Brown
patent: 4164874 (1979-08-01), Cassatt et al.
patent: 4271393 (1981-06-01), Hansen et al.
patent: 4384252 (1983-05-01), Kolter
patent: 4644271 (1987-02-01), Toth et al.
patent: 4675057 (1987-06-01), Pfaffmann et al.
patent: 4746858 (1988-05-01), Metala et al.
patent: 4810966 (1989-03-01), Schmall
patent: 4963826 (1990-10-01), Capobianco et al.
patent: 5006800 (1991-04-01), Hedengren et al.
patent: 5015951 (1991-05-01), Melcher
patent: 5227731 (1993-07-01), Prabhakaran et al.
patent: 5262722 (1993-11-01), Hedengren et al.
patent: 5311128 (1994-05-01), Lareau et al.
patent: 5453689 (1995-09-01), Goldfine et al.
patent: 5467014 (1995-11-01), Nix
patent: 5549803 (1996-08-01), Schoess et al.
patent: 5610517 (1997-03-01), Ma et al.
patent: 5617024 (1997-04-01), Simpson et al.
patent: 5629621 (1997-05-01), Goldfine et al.
patent: RE35703 (1997-12-01), Koch et al.
patent: 5698977 (1997-12-01), Simpson et al.
patent: 5793206 (1998-08-01), Goldfine et al.
patent: 5966011 (1999-10-01), Goldfine et al.
patent: 5969260 (1999-10-01), Belk et al.
patent: 6420867 (2002-07-01), Goldfine et al.
patent: 6501267 (2002-12-01), Kurokawa et al.
patent: 6657429 (2003-12-01), Goldfine et al.
patent: 6952095 (2005-10-01), Goldfine et al.
patent: 2005/0027476 (2005-02-01), Lim
patent: 0 577 244 (1994-01-01), None
patent: 0 884 588 (1998-12-01), None
patent: 886247 (1962-01-01), None
patent: 1 567 600 (1980-05-01), None
patent: 58006458 (1983-01-01), None
patent: WO 98/30921 (1998-07-01), None
patent: WO 98/40732 (1998-09-01), None
patent: WO 99/22231 (1999-05-01), None
patent: WO 99/26062 (1999-05-01), None
Auld, B.A. and Moulder, J.C. (1999), “Review of Advances in Quantitative Eddy-Current Nondestructive Evaluation,” Journal of Nondestructive Evaluation, vol. 18, No. 1.
Committee on Aging of US Air Force Aircraft (1997), “Aging of US Air Force Aircraft”, ISBN 0-309-05935-6, 1997.
Friedel, J. (1964), Dislocations, Pergamon Press.
Goldfine, N., A. Washabaugh, K. Walrath, P. Zombo, and R. Miller (1998), “Conformable Eddy-Current Sensors and Methods for Gas Turbine Inspection and Health Monitoring”, ASM International, Gas Turbine Technology Conference, Materials Solutions '98, Rosemont, IL.
Goldfine, N., et al., (1998 NASA), “Surface-Mounted Eddy-Current Sensors for On-Line Monitoring of Fatigue Tests and for Aircraft Health Monitoring,” presented at the Second Joint NASA/FAA/DoD Conference on Aging Aircraft, Aug. 1998.
Suresh, S. (1998), Fatigue of Materials, Second Edition, Cambridge University Press.
Navy Phase I Proposal, titled “Application of the Meandering Wire Magnetometer to Detection and Quantification of Cumulative Fatigue Damage in Aircraft Structural Components”, Topic #N95-033, dated Jan. 12, 1995.
Navy Phase I Final Report, titled “Application of the Meandering Wire Magnetometer to Detection and Quantification of Cumulative Fatigue Damage in Aircraft Structural Components”, dated Apr. 30, 1996, Contract #N00019-95-C-0220.
Navy Phase II Proposal, titled “Application of the Meandering Wire Magnetometer to Detection and Quantification of Cumulative Fatigue Damage in Aircraft Structural Components”, Topic #N95-033, dated May 17, 1996.
Navy Phase II Final Report, titled “Application of the Meandering Wire Magnetometer to Detection and Quantification of Cumulative Fatigue Damage in Aircraft Structural Components”, dated Feb. 16, 1999, Contract #N00421-97-C-1120.
Air Force Phase I Proposal, titled “Portable Accumulated Fatigue Damage Inspection System Using Permanently Mounted and Wide-Area Imaging MWM-Arrays”, Topic #AF99-286, dated Jan. 11, 1999.
Air Force Phase II Proposal, titled “Portable Accumulated Fatigue Damage Inspection System Using Permanently Mounted and Wide-Area Imaging MWM-Arrays”, Topic #AF99-286, dated Dec. 3, 1999.
Air Force Phase I Final Report, titled “Portable Accumulated Fatigue Damage Inspection System Using Permanently Mounted and Wide-Area Imaging MWM-Arrays”, dated Mar. 10, 2000, Contract #F09650-99-M-1328.
Jentek Sensors Trip Report to Tinker AFB, dated Jul. 6, 1999.
Technical Abstract titled “New MWM Arrays with High Resolution and Increased Depth of Sensitivity for Quantitative Imaging of ‘Hidden’ Fatigue and Corrosion over Wide Areas,” submitted to the Third Joint NASA/FAA/DoD Conference on Aging Aircraft, Sep. 1999.
Technical Paper titled “Recent Applications of Meandering Winding Magnetometers to Materials Characterization”, presented at the 38thAnnual British Conference on NDT, Sep. 13-16, 1999.
Technical Paper titled “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 16, 2000.
Presentation Slides titled “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 16, 2000.
FAA Year Two Final Report titled “Development of Conformable Eddy-Current Sensors for Engine Component Inspection,” dated Aug. 4, 2000, Contract #DTFA0398-D00008.
Technical Paper titled “Application of MWM-Array Eddy-Current Sensors to Corrosion Mapping”, presented at the 4thInternational Aircraft Corrosion Workshop, Aug. 22, 2000.

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