Crack detection for the graphite slab using the high-Tc SQUID in unshielded environment

Jen Tzong Jeng; Herng Er Horng; Hong Chang Yang

doi:10.1016/S0921-4534(02)00647-0

Crack detection for the graphite slab using the high-T_c SQUID in unshielded environment

Jen Tzong Jeng, Herng Er Horng^*, Hong Chang Yang

^*Corresponding author for this work

Undergraduate Program of Electro-Optical Engineering

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The nondestructive evaluation (NDE) for the crack inside a graphite slab was investigated by using the high-T(c) SQUID NDE system in unshielded environment. The crack-depth dependence of the crack signal was explored with the excitation frequency varied from 2 to 20 kHz. It was found that the phase of the crack signal is a linear function of the crack depth for various excitation frequencies. In addition, forlinear phase depth relation scaled in an empirical equation with the skin depth as the only variable. The empirical equation was useful in determining the proper excitation frequency for the eddy-current NDE of conductive samples.

Original language	English
Pages (from-to)	174-177
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	372-376
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(02)00647-0
Publication status	Published - 2002 Aug

Keywords

Graphite
Nondestructive evaluation
SQUID
Skin depth

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(02)00647-0

Cite this

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title = "Crack detection for the graphite slab using the high-Tc SQUID in unshielded environment",

abstract = "The nondestructive evaluation (NDE) for the crack inside a graphite slab was investigated by using the high-T(c) SQUID NDE system in unshielded environment. The crack-depth dependence of the crack signal was explored with the excitation frequency varied from 2 to 20 kHz. It was found that the phase of the crack signal is a linear function of the crack depth for various excitation frequencies. In addition, forlinear phase depth relation scaled in an empirical equation with the skin depth as the only variable. The empirical equation was useful in determining the proper excitation frequency for the eddy-current NDE of conductive samples.",

keywords = "Graphite, Nondestructive evaluation, SQUID, Skin depth",

author = "Jeng, {Jen Tzong} and Horng, {Herng Er} and Yang, {Hong Chang}",

note = "Funding Information: This work is supported by the National Science Council of the ROC under grant nos.: NSC89-2112-M-003-040 and NSC89-2112-M-002-071.",

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AU - Jeng, Jen Tzong

AU - Horng, Herng Er

AU - Yang, Hong Chang

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AB - The nondestructive evaluation (NDE) for the crack inside a graphite slab was investigated by using the high-T(c) SQUID NDE system in unshielded environment. The crack-depth dependence of the crack signal was explored with the excitation frequency varied from 2 to 20 kHz. It was found that the phase of the crack signal is a linear function of the crack depth for various excitation frequencies. In addition, forlinear phase depth relation scaled in an empirical equation with the skin depth as the only variable. The empirical equation was useful in determining the proper excitation frequency for the eddy-current NDE of conductive samples.

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