Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe

In a new approach to eddy current detection and sizing of surface-breaking flaws, we have coupled a conventional reflection probe to a superconducting quantum interference device (SQUID) to produce an eddy current probe with increased sensitivity and signal to noise ratio. The reflection probe consi...

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Detalles Bibliográficos
Autores principales: Moulder, J. C., Capobianco, T. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1987
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5286975/
http://dx.doi.org/10.6028/jres.092.003
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author Moulder, J. C.
Capobianco, T. E.
author_facet Moulder, J. C.
Capobianco, T. E.
author_sort Moulder, J. C.
collection PubMed
description In a new approach to eddy current detection and sizing of surface-breaking flaws, we have coupled a conventional reflection probe to a superconducting quantum interference device (SQUID) to produce an eddy current probe with increased sensitivity and signal to noise ratio. The reflection probe consists of an air-core excitation coil surrounding two counterwound ferite-core pickup coils connected in series. A room-temperature probe is inductively coupled to a SQUID, which operates in a liquid helium bath. The new probe was used to obtain flaw signals from a number of electrical-discharge machined slots in aluminum alloy 6061. Results indicated that by scanning the probe along the length of the flaw, the length could be determined from the extent of the flaw signal. The peak amplitude of the flaw signal was found to be proportional to the cross-sectional area of the flaw. Empirical calibration curves relating these quantities were used to invert successfully the experimental data obtained for the EDM slots.
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spelling pubmed-52869752021-08-02 Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe Moulder, J. C. Capobianco, T. E. J Res Natl Bur Stand (1977) Article In a new approach to eddy current detection and sizing of surface-breaking flaws, we have coupled a conventional reflection probe to a superconducting quantum interference device (SQUID) to produce an eddy current probe with increased sensitivity and signal to noise ratio. The reflection probe consists of an air-core excitation coil surrounding two counterwound ferite-core pickup coils connected in series. A room-temperature probe is inductively coupled to a SQUID, which operates in a liquid helium bath. The new probe was used to obtain flaw signals from a number of electrical-discharge machined slots in aluminum alloy 6061. Results indicated that by scanning the probe along the length of the flaw, the length could be determined from the extent of the flaw signal. The peak amplitude of the flaw signal was found to be proportional to the cross-sectional area of the flaw. Empirical calibration curves relating these quantities were used to invert successfully the experimental data obtained for the EDM slots. [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 1987 1987-02-01 /pmc/articles/PMC5286975/ http://dx.doi.org/10.6028/jres.092.003 Text en https://creativecommons.org/publicdomain/zero/1.0/ The Journal of Research of the National Bureau of Standards is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.
spellingShingle Article
Moulder, J. C.
Capobianco, T. E.
Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title_full Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title_fullStr Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title_full_unstemmed Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title_short Detection and Sizing of Surface Flaws With a SQUID-Based Eddy Current Probe
title_sort detection and sizing of surface flaws with a squid-based eddy current probe
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5286975/
http://dx.doi.org/10.6028/jres.092.003
work_keys_str_mv AT moulderjc detectionandsizingofsurfaceflawswithasquidbasededdycurrentprobe
AT capobiancote detectionandsizingofsurfaceflawswithasquidbasededdycurrentprobe

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