Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects

Keiji Tsukada, Hiroto Shobu, Yuto Goda, Takumi Kobara, Kenji Sakai, Toshihiko Kiwa, Mohd Mawardi Saari

Research output: Contribution to journalArticle

Abstract

Eddy current testing with excitation and pickup coils is widely used to detect defects in metals. The detection of submillimeter defects is difficult because of limitations on pickup coil size. We have developed an integrated magnetic probe for detecting submillimeter defects in both nonmagnetic and ferromagnetic materials. The sensor probe consists of a tunneling magnetoresistance (TMR) device and an excitation wire. This probe can apply small, localized magnetic fields to a sample that is near the TMR sensor. The direction of the field excitation is perpendicular to the sensing direction of the TMR sensor to minimize magnetic coupling between the excitation wire and the sensor. A change in the line-scanned signal was detected when measuring pits from 0.5 mm to 1.0 mm in diameter at depths of more than 0.1 mm in both steel and aluminum plates. Signal changes depended on defect size. As the frequency was increased from 1 kHz to 50 kHz, the defect signal change for the aluminum plate increased due to an increase in eddy currents. A clear defect signal for the steel plate was obtained even at a low frequency of 1 kHz because the detected signal for steel consists of a frequency-dependent eddy-current component and a magnetization component even at low frequencies.

Original languageEnglish
Article number8809197
JournalIEEE Magnetics Letters
Volume10
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Magnetic sensors
Tunnelling magnetoresistance
Wire
Defects
Steel
Pickups
Sensors
Eddy currents
Aluminum
Eddy current testing
Magnetic couplings
Ferromagnetic materials
Magnetization
Metals
Magnetic fields

Keywords

  • defect detection
  • eddy current testing
  • Magnetic instruments
  • nondestructive testing
  • steel
  • tunneling magnetoresistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects. / Tsukada, Keiji; Shobu, Hiroto; Goda, Yuto; Kobara, Takumi; Sakai, Kenji; Kiwa, Toshihiko; Saari, Mohd Mawardi.

In: IEEE Magnetics Letters, Vol. 10, 8809197, 01.01.2019.

Research output: Contribution to journalArticle

Tsukada, Keiji ; Shobu, Hiroto ; Goda, Yuto ; Kobara, Takumi ; Sakai, Kenji ; Kiwa, Toshihiko ; Saari, Mohd Mawardi. / Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects. In: IEEE Magnetics Letters. 2019 ; Vol. 10.
@article{94bd1efa93124fc4a2f90c49855202a8,
title = "Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects",
abstract = "Eddy current testing with excitation and pickup coils is widely used to detect defects in metals. The detection of submillimeter defects is difficult because of limitations on pickup coil size. We have developed an integrated magnetic probe for detecting submillimeter defects in both nonmagnetic and ferromagnetic materials. The sensor probe consists of a tunneling magnetoresistance (TMR) device and an excitation wire. This probe can apply small, localized magnetic fields to a sample that is near the TMR sensor. The direction of the field excitation is perpendicular to the sensing direction of the TMR sensor to minimize magnetic coupling between the excitation wire and the sensor. A change in the line-scanned signal was detected when measuring pits from 0.5 mm to 1.0 mm in diameter at depths of more than 0.1 mm in both steel and aluminum plates. Signal changes depended on defect size. As the frequency was increased from 1 kHz to 50 kHz, the defect signal change for the aluminum plate increased due to an increase in eddy currents. A clear defect signal for the steel plate was obtained even at a low frequency of 1 kHz because the detected signal for steel consists of a frequency-dependent eddy-current component and a magnetization component even at low frequencies.",
keywords = "defect detection, eddy current testing, Magnetic instruments, nondestructive testing, steel, tunneling magnetoresistance",
author = "Keiji Tsukada and Hiroto Shobu and Yuto Goda and Takumi Kobara and Kenji Sakai and Toshihiko Kiwa and Saari, {Mohd Mawardi}",
year = "2019",
month = "1",
day = "1",
doi = "10.1109/LMAG.2019.2936392",
language = "English",
volume = "10",
journal = "IEEE Magnetics Letters",
issn = "1949-307X",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects

AU - Tsukada, Keiji

AU - Shobu, Hiroto

AU - Goda, Yuto

AU - Kobara, Takumi

AU - Sakai, Kenji

AU - Kiwa, Toshihiko

AU - Saari, Mohd Mawardi

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Eddy current testing with excitation and pickup coils is widely used to detect defects in metals. The detection of submillimeter defects is difficult because of limitations on pickup coil size. We have developed an integrated magnetic probe for detecting submillimeter defects in both nonmagnetic and ferromagnetic materials. The sensor probe consists of a tunneling magnetoresistance (TMR) device and an excitation wire. This probe can apply small, localized magnetic fields to a sample that is near the TMR sensor. The direction of the field excitation is perpendicular to the sensing direction of the TMR sensor to minimize magnetic coupling between the excitation wire and the sensor. A change in the line-scanned signal was detected when measuring pits from 0.5 mm to 1.0 mm in diameter at depths of more than 0.1 mm in both steel and aluminum plates. Signal changes depended on defect size. As the frequency was increased from 1 kHz to 50 kHz, the defect signal change for the aluminum plate increased due to an increase in eddy currents. A clear defect signal for the steel plate was obtained even at a low frequency of 1 kHz because the detected signal for steel consists of a frequency-dependent eddy-current component and a magnetization component even at low frequencies.

AB - Eddy current testing with excitation and pickup coils is widely used to detect defects in metals. The detection of submillimeter defects is difficult because of limitations on pickup coil size. We have developed an integrated magnetic probe for detecting submillimeter defects in both nonmagnetic and ferromagnetic materials. The sensor probe consists of a tunneling magnetoresistance (TMR) device and an excitation wire. This probe can apply small, localized magnetic fields to a sample that is near the TMR sensor. The direction of the field excitation is perpendicular to the sensing direction of the TMR sensor to minimize magnetic coupling between the excitation wire and the sensor. A change in the line-scanned signal was detected when measuring pits from 0.5 mm to 1.0 mm in diameter at depths of more than 0.1 mm in both steel and aluminum plates. Signal changes depended on defect size. As the frequency was increased from 1 kHz to 50 kHz, the defect signal change for the aluminum plate increased due to an increase in eddy currents. A clear defect signal for the steel plate was obtained even at a low frequency of 1 kHz because the detected signal for steel consists of a frequency-dependent eddy-current component and a magnetization component even at low frequencies.

KW - defect detection

KW - eddy current testing

KW - Magnetic instruments

KW - nondestructive testing

KW - steel

KW - tunneling magnetoresistance

UR - http://www.scopus.com/inward/record.url?scp=85071689529&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85071689529&partnerID=8YFLogxK

U2 - 10.1109/LMAG.2019.2936392

DO - 10.1109/LMAG.2019.2936392

M3 - Article

VL - 10

JO - IEEE Magnetics Letters

JF - IEEE Magnetics Letters

SN - 1949-307X

M1 - 8809197

ER -