Magnetic sensing via ultrasonic excitation

Yamada, Hisato; Takashima, Kazuya; Ikushima, Kenji; Toida, Hiraku; Sato, Michitaka; Ishizawa, Yoshiichi

doi:10.1063/1.4803188

Cited by 13 publications

(14 citation statements)

References 11 publications

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“…It follows that the ASEM response shows a maximum in the H-dependence. In the linear response regime, 5) the ASEM intensity corresponds to the slope of the magnetostriction curve, as observed in the transmitter properties of EMAT techniques, 9,10) because…”

Section: Resultsmentioning

confidence: 83%

“…Recently, we presented a magnetic detection technique that incorporated ultrasonic inspection. 4,5) The principle of this technique is based on the generation of acoustically stimulated electromagnetic (ASEM) fields through magnetomechanical coupling. An advantage of the ASEM method is that it is compatible with conventional ultrasonic pulse-echo sensing, and can be used for evaluating the magnetic properties of a material even in optically opaque objects such as a human body, plastic, and concrete.…”

Section: Introductionmentioning

confidence: 99%

“…An advantage of the ASEM method is that it is compatible with conventional ultrasonic pulse-echo sensing, and can be used for evaluating the magnetic properties of a material even in optically opaque objects such as a human body, plastic, and concrete. 5) In addition, unlike the leakage flux techniques, the intrinsic magnetic flux flowing inside the target materials is visualized through RFultrasonic excitation. Another feature of the ASEM method is that the distance between the RF-receiver antenna and the target sample (typically 1-5 cm) does not affect the spatial resolution; it is determined by the size of the ultrasonic focal spot.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic hysteresis and magnetic flux patterns measured by acoustically stimulated electromagnetic response in a steel plate

Yamada¹,

Watanabe²,

Ikushima³

2015

Jpn. J. Appl. Phys.

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Magnetic hysteresis loops are measured by ultrasonic techniques and used in visualizing the magnetic-flux distribution in a steel plate. The piezomagnetic coefficient determines the amplitude of acoustically stimulated electromagnetic (ASEM) fields, yielding the hysteresis behavior of the intensity of the ASEM response. By utilizing the high correspondence of the ASEM response to the magnetic-flux density, we image the specific spatial patterns of the flux density formed by an artificial defect in a steel plate specimen. Magnetic-flux probing by ultrasonic waves is thus shown to be a viable method of nondestructive material inspection.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic hysteresis and magnetic flux patterns measured by acoustically stimulated electromagnetic response in a steel plate

Yamada¹,

Watanabe²,

Ikushima³

2015

Jpn. J. Appl. Phys.

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“…In the ASEM wave technique, an object is irradiated with ultrasound waves and the electromagnetic waves induced by magnetomechanical coupling are detected using a magnetic sensor. [1][2][3] Biomedical applications have been investigated and industrial applications are also promising. 4,5) In biological tissues such as bone, the electric field modulation due to piezoelectricity generates the ASEM waves.…”

Section: Introductionmentioning

confidence: 99%

Flaw Detection for Thin Sheet Using Acoustic Stimulated Electromagnetic Wave Technique

Yotsuji¹,

Ikushima

Yamada

2020

ISIJ Int.

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Acoustically stimulated electromagnetic (ASEM) waves in thin steel sheets have been investigated for flaw detection. In the ASEM wave technique, magnetization is temporally modulated at the radio frequency (rf) of the irradiated ultrasonic waves through magnetomechanical coupling. The induced rf magnetic fields are detected by a resonant coil antenna and spatial images are obtained by scanning the ultrasound focal spot. In this work, we detected artificial defects (through holes) in thin steel sheets. Specific patterns of magnetic flux density caused by the hole were observed. By improving the sensitivity with a small coil antenna, we visualized a through hole 0.1 mm in diameter with a lift-off of 10 mm.

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“…In recent years, however, electric or magnetic properties have been successfully visualized by ultrasonic focusing and scanning. [9][10][11] The principle of this technique is based on the generation and detection of acoustically stimulated electromagnetic (ASEM) waves through electro-or magnetomechanical coupling. 12) In the ASEM method, electric or magnetic polarization is temporally modulated with the radio frequency (rf) of irradiated ultrasonic waves.…”

Section: Introductionmentioning

confidence: 99%

Phase-sensitive detection of acoustically stimulated electromagnetic response in steel

Yamada

Yotsuji²,

Ikushima

2018

Jpn. J. Appl. Phys.

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The signal amplitude and the phase of acoustically stimulated electromagnetic (ASEM) response have been investigated in steel. In the ASEM method, magnetization is temporally modulated with the radio frequency (rf) of irradiated ultrasonic waves through magnetomechanical coupling. The first-harmonic components of the induced rf dipolar magnetic fields are detected using a resonant loop antenna. The signal amplitude of ASEM waves is determined by the magnitude of local piezomagnetic coefficients on an acoustically excited spot. Here, we divided the ASEM waves into the “in-phase” and “quadrature” components by phase-sensitive detection (PSD). On the basis of the linear response theory, we provided the theoretical formalism of ASEM response by introducing local complex piezomagnetic coefficients, dloc = d′ + id′′. We investigated the magnetic field (H) dependence of the individual components on the different surface conditions of steel plates. The in-phase component [∝ d′(H)] shows a hysteresis loop on the machined surface of a steel plate, in which d′(H) switches sign at two finite field values, ±H0. The inversion of magnetization associated with the applied static fields is thus definitely observed in the PSD measurements. In addition, we measured the hysteresis behaviors on a steel surface with a thin mill scale (iron oxide layers). The hysteresis loop broadens and a significant contribution of the quadrature component [∝ d′′(H)] is found. We discuss the origin of the hysteresis behaviors of d′ and d′′ using the Debye relaxation model.

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Magnetic sensing via ultrasonic excitation

Cited by 13 publications

References 11 publications

Magnetic hysteresis and magnetic flux patterns measured by acoustically stimulated electromagnetic response in a steel plate

Magnetic hysteresis and magnetic flux patterns measured by acoustically stimulated electromagnetic response in a steel plate

Flaw Detection for Thin Sheet Using Acoustic Stimulated Electromagnetic Wave Technique

Phase-sensitive detection of acoustically stimulated electromagnetic response in steel

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