NDLI: Aircraft wheel testing with remote eddy current technique using a HTS SQUID magnetometer

Content Provider	IEEE Xplore Digital Library
Author	Hohmann, R. Lomparski, D. Krause, H.-J. v. Kreutzbruck, M. Becker, W.
Copyright Year	2002
Abstract	An aircraft wheel testing system using a planar HTS SQUID gradiometer with Joule-Thomson machine cooling in conjunction with differential eddy current (EC) excitation has recently been developed. From a routine performance test in the wheel testing facility at the Lufthansa Base, Frankfurt/M. Airport, we learned that quadrupolar flaw signatures complicate signal interpretation considerably. In order to overcome these difficulties, the system was equipped with a HTS rf magnetometer SQUID sensor and an absolute EC excitation coil. The coil was mounted with a lateral displacement with respect to the SQUID. The geometry was chosen similar to the remote EC technique: a given point on the rotating wheel first passes underneath the excitation coil and then underneath the sensor. We analyzed the dependence of the response field of an inside crack on excitation coil displacement, EC frequency and lock-in phase angle and found an optimum rotation velocity for deep lying defects. The depth selectivity of the technique is discussed.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1279
Ending Page	1282
Page Count	4
File Size	676381
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aircraft Wheels Eddy current testing Eddy currents Coils SQUIDs High temperature superconductors Magnetic sensors System testing Cooling
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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