TITLE

Data recovering techniques for superconducting quantum interference device and its application to nondestructive evaluation

AUTHOR(S)
Kojima, F.; Kasai, N.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1955
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recently interest has grown for assessing the structural integrity of materials using superconducting quantum interference device (SQUID). SQUIDs involve an extremely high magnetic flux sensitivity and, as a result, magnetic imaging techniques using SQUIDs have a high spatial resolution. However, due to the high magnetic sensitivity of SQUIDs measurement data are heavily corrupted by various kinds of noise in environmental circumstance. SQUID gradiometer could be expected to be a tough measurement technique for overcoming environmental noise. In this paper, an effective computational method is proposed for recovering data by the data acquisition of SQUID gradiometer. A mathematical model of the recovering process is described by an integro-differential equation in a two dimensional spatial domain. The inversion technique proposed here is formulated as a minimization of the regularized least square problem. A computational algorithm of finding an optimal solution is described by using the finite difference scheme. The proposed scheme is applied to the nondestructive testing for detecting cracks in conductor. The effectiveness and validity of the proposed method are demonstrated through computational experiments with laboratory data. © 2000 American Institute of Physics.
ACCESSION #
6029162

 

Related Articles

  • Unshielded use of thin-film Nb dc superconducting quantum interference devices and integrated.... Walker, M.E.; Nakane, H.; Cochran, A.; Weston, R.G.; Klein, U.; Pegrum, C.M.; Donaldson, G.B. // Applied Physics Letters;7/7/1997, Vol. 71 Issue 1, p131 

    Presents nondestructive evaluation measurements using thin-film niobium direct current superconducting quantum interference devices with integrated asymmetric first-order gradiometers. Operation of the interference devices; Location of the structure subsurface defects; Design of the gradiometers.

  • Defect profiles identification of conducting materials using HTS-SQUID gradiometer with multiple frequencies. Kojima, F.; Kawai, R.; Kasai, N.; Hatsukade, Y. // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p377 

    This paper is concerned with a quantitative nondestructive evaluation of conducting materials using high temperature superconducting quantum interference devices (HTS-SQUIDs). A mathematical model of the nondestructive evaluation system is described by a three dimensional eddy current model. The...

  • SQUID measurements for thermal aging of stator windings. Ma, Yu Pei; Wikswo, John P.; Fitzpatrick, Gerald // AIP Conference Proceedings;2001, Vol. 557 Issue 1, p369 

    Conventional non-destructive diagnostic tests for aging of dielectric insulation on high voltage cables and stator windings are limited to measurements of lumped electrical parameters. Commonly used step voltage tests may lead to breakdown of the insulation and damage to the system. A map of...

  • Practical SQUID instrument for nondestructive testing. Tralshawala, N.; Claycomb, J.R. // Applied Physics Letters;9/15/1997, Vol. 71 Issue 11, p1573 

    Examines the development of superconducting quantum interference device (SQUID) for eddy-current nondestructive testing (NDT). Importance of SQUID in facilitating subsurface eddy current flaw detection; Use of cylindrical shields for high frequency probes; Considerations for NDT applications.

  • Compensation electronics for larger dynamic range of a SQUID based nondestructive... Kreutzbruck, M. v.; Theiss, A.; Muck, M.; Heiden, C. // Review of Scientific Instruments;Sep99, Vol. 70 Issue 9, p3714 

    Reports on the development of a compensation system for any given SQUID sensor which allows sensitive eddy current measurements above 100Hz in the presence of strong and slowly varying background fields. Successful use in nondestructive evaluation systems; Special compensation electronics.

  • NDT Info.  // Insight: Non-Destructive Testing & Condition Monitoring;Aug2009, Vol. 51 Issue 8, p452 

    The article presents abstracts on topics regarding nondestructive testing (NDT), some of which are presented in various conferences, including risk management, the development and use of superconducting quantum interference devices (SQUIDs) and a method in defect extraction in X-ray images.

  • Analysis of non-destructive testing of three-dimensional braided composites using scanning SQUID NDT. Zhenkai, Wan; Zhangang, Wang; Jianmin, Guo // Insight: Non-Destructive Testing & Condition Monitoring;May2014, Vol. 56 Issue 5, p246 

    The aim of this study is to provide an adequate understanding of the damage mechanism of three-dimensional braided composites based on offline measurements using the superconducting quantum interference device (SQUID) technique. This paper presents research into SQUID flux imaging for 3D braided...

  • Simulation and design of a superconducting eddy current probe for nondestructive testing Claycomb, James R.; Tralshawala, Nilesh; Cho, Hsiao-Mei; Boyd, Mike; Zou, Zhongji; Xu, Xin Wen; Miller, Jr., John H. // Review of Scientific Instruments;Feb1998, Vol. 69 Issue 2, p499 

    Evaluates a superconducting eddy current probe for nondestructive testing. Use of a superconducting quantum interference device (SQUID) from electromagnetic interference; Importance of SQUID to the probe; Calculation of eddy current densities; Computation of the shielding factors for the...

  • Detection of Magnetomechanical Effect in Structural Steel Using SQUIDs and Flux-gate Sensors. Bonavolontà, C.; Peluso, G.; Valentino, M.; Iorio, A.; Penta, F. // Journal of Superconductivity & Novel Magnetism;Nov2009, Vol. 22 Issue 8, p833 

    In this work we present a non-destructive technique to detect the magnetization changes due to mechanical stress produced in steel notched plates under tensile loads. The measurements have been carried out using, separately, a magnetic field probe based on HTS dc SQUID and a flux-gate...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics