Conference: Publication Date: 7 June 2016Testing Method:
This paper describes a new hand-held 7-channel fully parallel impedance instrument that can support a wide range of eddy current sensors. Applications include 7-channel flexible MWM®-Array sensors for rapid imaging of corrosion or first and second layer cracks in lap-joints, and segmented field eddy current sensors for characterization of coatings in turbines or structures. MWM-Arrays enable multiple frequency model-based characterization of lap-joints, discriminating between first and second layer corrosion, and discrimination between inconsequential gaps between layers and actual material loss. Linear drive MWM-Arrays also support composite impact damage imaging and fiber orientation characterization. Segmented field eddy current sensors enable enhanced characterization of multiple layered coatings [1-5]. The hand-held system is complementary to larger 19- and 39-channel versions (expandable to 119 fully parallel channels) that can provide both wide area rapid scanning with inductive sensing element MWM-Arrays and very low frequency operation with magnetoresistive sensors (e.g., MR-MWM-Arrays) for imaging of buried corrosion in thicker structures. This presentation will describe the recent advances in the hand-held instrumentation and MWM-Array technologies for a range of applications.
[1] Goldfine, N., Zilberstein, V., Schlicker, D., Grundy, D., Shay, I., Lyons, R., Lovett, T., LaCivita, K.,
“Enhancements in MWM -Array Hidden Corrosion Imaging,” Tri-Service Corrosion Conference, Las Vegas,
Nevada, November 17-21, 2003.
[2] ASTM E2338-11 Standard Practice for Characterization of Coatings Using Conformable Eddy-Current Sensors
without Coating Reference Standards, ASTM International, Book of Standards, Vol. 03.03.
[3] ASTM E2884-13 Standard Guide for Eddy Current Testing of Electrically Conducting Materials Using
Conformable Sensor Arrays, ASTM International, Book of Standards, Vol. 03.03.
[4] Goldfine, N., Grundy, D., Windoloski, M., Chaplan, S., Sheiretov, Y., Thomas, Z., “Reliable Detection of Small
Cracks Induced During Service for Fatigue Critical Components,” Airworthiness Conference (AA&S), Grapevine,
Texas, March 21-24, 2016.
[5] Goldfine, N., Sheiretov, Y., Denenberg, S., Dunford, T., Washabaugh, A., Thomas, Z., JENTEK Sensors, Inc.
Technical Document Number TR_2016_05_13_Handheld titled “ Hand-Held, Wireless (or Ethernet) Eddy Current
Array System for Rapid Inspection” dated May 13, 2016.
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