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Theory and application of high tempe...

Claycomb, James Ronald.

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Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation./
Author:	Claycomb, James Ronald.
Description:	259 p.
Notes:	Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1711.
Contained By:	Dissertation Abstracts International59-04B.
Subject:	Physics, Electricity and Magnetism. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9832097
ISBN:	0591851091

Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation.
Claycomb, James Ronald.

Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation. - 259 p.

Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1711.

Thesis (Ph.D.)--University of Houston, 1998.

Several High-

ISBN: 0591851091Subjects--Topical Terms:

1019535
Physics, Electricity and Magnetism.

Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation.
LDR:03371nmm 2200301 4500 001 1837855
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008 130614s1998 eng d
020 $a 0591851091
035 $a (UnM)AAI9832097
035 $a AAI9832097
040 $a UnM $c UnM
100 1 $a Claycomb, James Ronald. $3 1926284
245 1 0 $a Theory and application of high temperature superconducting eddy current probes for nondestructive evaluation.
300 $a 259 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-04, Section: B, page: 1711.
500 $a Adviser: John H. Miller, Jr.
502 $a Thesis (Ph.D.)--University of Houston, 1998.
520 $a Several High- $ Superconducting (HTS) eddy current probes have been developed for applications in electromagnetic nondestructive evaluation (NDE) of conducting materials. The probes utilize high- $ SUperconducting Quantum Interference Device (SQUID) magnetometers to detect the fields produced by the perturbation of induced eddy currents resulting from subsurface flaws. Localized HTS shields are incorporated to selectively screen out environmental electromagnetic interference and enable movement of the instrument in the Earth's magnetic field. High permeability magnetic shields are employed to focus flux into, and thereby increase the eddy current density in the metallic test samples. NDE test results are presented, in which machined flaws in aluminum alloy are detected by probes of different design. A novel current injection technique performing NDE of wires using SQUIDs is also discussed.
520 $a The HTS and high permeability shields are designed based on analytical and numerical finite element method (FEM) calculations presented here. Superconducting and high permeability magnetic shields are modeled in uniform noise fields and in the presence of dipole fields characteristic of flaw signals. Several shield designs are characterized in terms of (1) their ability to screen out uniform background noise fields; (2) the resultant improvement in signal-to-noise ratio and (3) the extent to which dipole source fields are distorted.
520 $a An analysis of eddy current induction is then presented for low frequency SQUID NDE. Analytical expressions are developed for the induced eddy currents and resulting magnetic fields produced by excitation sources above conducting plates of varying thickness. The expressions derived here are used to model the SQUID's response to material thinning. An analytical defect model is also developed, taking into account the attenuation of the defect field through the conducting material, as well as the current flow around the edges of the flaw.
520 $a Time harmonic FEM calculations are then used to model the electromagnetic response of eight probe designs, consisting of an eddy current drive coil coupled to a SQUID surrounded by superconducting and/or high permeability magnetic shielding. Simulations are carried out with the eddy current probes located a finite distance above a conducting surface. Results are quantified in terms of shielding and focus factors for each probe design.
590 $a School code: 0087.
650 4 $a Physics, Electricity and Magnetism. $3 1019535
690 $a 0607
710 2 0 $a University of Houston. $3 1019266
773 0 $t Dissertation Abstracts International $g 59-04B.
790 1 0 $a Miller, John H., Jr., $e advisor
790 $a 0087
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9832097