The Use of Squids for Nondestructive Evaluation

We open with an account of early work on SQUID NDE, describing remote magnetometry and galvanometry, and the inverse problem. Then we concentrate on our own progress in mapping the magnetic fields produced by eddy-currents as flaws in conducting structures distort their flow. The Finite Element Method, the Volume Integral Method and other approaches to the problem of deducing flaw locations are reviewed. Next we turn to developments with high-Tc SQUID systems, concentrating on ‘electronic gradiometers’ where the outputs of more than one SQUID are differenced to eliminate common mode fields. Flaws breaking test piece surfaces both near-side to the detector and far-side have been imaged. Moreover they have been detected also in the lower layers of multi-sheet specimens.

[1]  Erber,et al.  Threshold of Barkhausen emission and onset of hysteresis in iron. , 1985, Physical review. B, Condensed matter.

[2]  M. Chester,et al.  Deep nondestructive testing using a bulk high T/sub c/ RF-SQUID , 1994, IEEE Transactions on Applied Superconductivity.

[3]  Heinz Lübbig,et al.  Superconducting Devices and Their Applications , 1992 .

[4]  G. Donaldson,et al.  INTEGRATED THIN FILM SQUID INSTRUMENTS , 1986 .

[5]  G. Donaldson,et al.  An improved design of high order superconducting gradiometer coils for magnetic monopole detection , 1984 .

[6]  R. Bain,et al.  A Generalisation of Planar Magnetic Gradiometer Design via Orthogonal Polynomials , 1995 .

[7]  Jack Blitz,et al.  Electrical and Magnetic Methods of Nondestructive Testing , 2020 .

[8]  Gordon B. Donaldson,et al.  SQUIDs for Everything Else , 1989 .

[9]  A. Lauder,et al.  Magnetic susceptibility imaging for nondestructive evaluation (using SQUID magnetometer) , 1993, IEEE Transactions on Applied Superconductivity.

[10]  A. Cochran,et al.  SQUID systems for non-destructive testing by AC field mapping , 1993, IEEE Transactions on Applied Superconductivity.

[11]  F. Livingstone,et al.  Review of progress in quantitative NDE: Williamsburg, VA, USA, 21–26 June 1987 , 1988 .

[12]  Jiri Vrba,et al.  Squid Gradiometers in Real Environments , 1996 .

[13]  S. Tan,et al.  Spatial resolution and sensitivity of magnetic susceptibility imaging , 1993, IEEE Transactions on Applied Superconductivity.

[14]  Roger Hilsen Koch,et al.  Room temperature three sensor magnetic field gradiometer , 1996 .

[15]  R. E. Beissner,et al.  Calculation of Eddy Current Fields for Coils of Arbitrary Shape , 1990 .

[16]  Ian M. Thomas,et al.  Superconducting magnetometry: a possible technique for aircraft NDE , 1993, Optics & Photonics.

[17]  A. D. Hibbs,et al.  A high‐resolution magnetic imaging system based on a SQUID magnetometer , 1992 .

[18]  C. Carr,et al.  Electronic gradiometry for NDE in an unshielded environment with stationary and moving HTS SQUIDs , 1996 .

[19]  J.P. Wikswo,et al.  SQUID NDE: detection of surface flaws by magnetic decoration , 1993, IEEE Transactions on Applied Superconductivity.

[20]  G. B. Donaldson,et al.  Improved Techniques for Structural NDT Using SQUIDs , 1992 .

[21]  William J. Gallagher,et al.  Three SQUID gradiometer , 1993 .

[22]  J. G. Bellingham,et al.  SQUID technology applied to the study of electrochemical corrosion , 1987 .

[23]  David M. McKirdy.  Recent improvements to the application of the volume integral method of eddy current modeling , 1989 .

[24]  A. Cochran,et al.  First-generation SQUID-based nondestructive testing system , 1993 .

[25]  L. N. Vu,et al.  Design and implementation of a scanning SQUID microscope , 1993, IEEE Transactions on Applied Superconductivity.

[26]  William J. Gallagher,et al.  High‐resolution scanning SQUID microscope , 1995 .

[27]  J.P. Wikswo,et al.  SQUID magnetometers for biomagnetism and nondestructive testing: important questions and initial answers , 1995, IEEE Transactions on Applied Superconductivity.

[28]  S. B. Palmer,et al.  A review of “ ELECTRICAL AND MAGNETIC METHODS OF NONDESTRUCTIVE TESTING ” Jack Blitz Adam Hilger, Bristol, UK 1991 £ 45 , 1992 .

[29]  N. G. Sepulveda,et al.  Using a magnetometer to image a two‐dimensional current distribution , 1989 .

[30]  Alex I. Braginski,et al.  A second-order SQUID gradiometer operating at 77 K , 1994 .

[31]  Robert M. Bowman,et al.  SQUIDS for NDT: the technology and its capabilities , 1993 .

[32]  Ling Hao,et al.  Using a 77 K SQUID to measure magnetic fields for NDE , 1994, IEEE Transactions on Applied Superconductivity.

[33]  Harold Weinstock,et al.  The New superconducting electronics , 1993 .

[34]  R. Bowman,et al.  More SQUID Applications , 1993 .

[36]  John P. Wikswo,et al.  Preliminary Measurements with MicroSQUID , 1989 .