NDLI: HTS SQUID system with Joule-Thomson cryocooler for eddy current nondestructive evaluation of aircraft structures

Content Provider	IEEE Xplore Digital Library
Author	Hohmann, R. Krause, H.-J. Soltner, H. Zhang, H. Copetti, C.A. Bousack, H. Braginski, A.I. Faley, M.I.
Copyright Year	2002
Abstract	For the detection of deep-lying flaws in aircraft structures, an eddy current system in conjunction with a planar SQUID gradiometer is being developed. The need for a mobile system imposes additional requirements on cooling regarding mobility, operation independent of spatial orientation, and handling. We present results on the operation of HTS SQUIDs with the commercial Joule-Thomson-cryocooler KC 100 ("cryotiger") by APD and report on cooler characteristics and system performance. Magnetometers and gradiometers of both rf and dc type have been integrated with the cryocooler. Noise spectra both in unshielded and shielded environments have been shown to be orientation independent. Compared to stationary operation, the system sensitivity is reduced by additional noise generated by the movement. With an improved integration scheme, this motion-related noise is nearly eliminated. The system was equipped with a differential eddy current excitation and a synchronized digital lock-in detection. Two-dimensional scans are presented that illustrate the system's capability to find fatigue cracks and corrosion pits hidden below several layers of aluminum.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2860
Ending Page	2865
Page Count	6
File Size	1024033
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Eddy currents Working environment noise Aircraft Cooling System performance SQUID magnetometers Noise reduction Noise generators Fatigue
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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