Generation and Detection of Longitudinal Wave in Steel Wires by Electromagnetic Acoustic Transducers.

Yamasaki, Tomohiro; Tamai, Shingo; Hirao, Masahiko

doi:10.1299/kikaia.65.1038

Cited by 7 publications

(4 citation statements)

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“…The EMAT is composed of an electromagnet surrounding the sheet, which can generate a static magnetic field along the axis direction of the sheet, and an electromagnetic induction coil which can generate a dynamic magnetic field along the axis direction of the sheet. A compound magnetic field can oscillate along the axis direction of the sheet, which is needed to generate a Lamb wave travelling along the long direction in the sheet [3][4][5][6][7]. …”

Section: Drive Principle Of a Lamb Wave Into A Rectangle-shape Sheet mentioning

confidence: 99%

Pipe inspection system by guide wave using a long distance waveguide

Murayama

Kobayashi

2016

AIP Conference Proceedings

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Section: Drive Principle Of a Lamb Wave Into A Rectangle-shape Sheet mentioning

confidence: 99%

Pipe inspection system by guide wave using a long distance waveguide

Murayama

Kobayashi

2016

AIP Conference Proceedings

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“…That is, the system can inspect at high speed using a multichannel pulser and receiver equipment. However, the experimental results using a single pulser and receiver system are indicated on the paper [16] [17] [18].…”

Section: Fundamental Idea Of a Trial Guide Wave Transmitter And Receimentioning

confidence: 99%

A New Guide Wave Inspection System Using Three Polarized Transverse Wave EMATs without Any Couplant

Murayama¹

2016

JST

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A guide wave is provided with the characteristic of long range propagation in the axis direction of a pipe, so it is possible to detect many defects over a large pipe area at once. At present, there is a technique to generate a guide wave using a piezoelectric element (PZT). However, the transverse wave-transducer using PZT needs to require a high viscosity couplant because the transverse wave cannot travel into typical liquid like water or oil. A guide wave inspection system that uses an electromagnetic ultrasonic transducer (EMAT) which does not require any couplant has then been developed to solve this trouble. First, a guide wave into a pipe, L, T and F-mode, can be transmitted and received by a polarized shear horizontal transverse wave propagating to the thickness direction when the vibration direction has been adjusted to the best direction. At next stage, the three EMATs for L, T and F-mode with different polarized vibration directions were piled up to improve the performance at the same position under the permanent magnet to inspect the pipe at the same condition. Next, the system with the EMATs can be confirmed to be able to detect three guide wave modes signal with enough intensity. Finally, the detection performance using the test pipes with any artificial defects has been done by the developed pipe inspection system, and any drilled holes and any notches can be detected. It is indicated that the developed system could be useful in real industrial field.

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“…When these EMATs are driven, an interference in the thickness direction and the circumferential direction can be generated. As a result, the F-mode guide wave may be injected [4]. For the developed system, it has been determined to evaluate whether or not there are advantages of not using the coupling medium of an EMAT.…”

Section: Fundamental Idea Of a Trial Guide Wave Systemmentioning

confidence: 99%

Pipe inspection system using a polarized transverse wave EMAT

et al. 2014

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The conventional non-destructive inspection of a pipe by an ultrasonic wave has low inspection efficiency because it is a technique that uses a longitudinal wave or transverse wave which propagates in the thickness direction of a pipe with a smaller area than the size of the ultrasonic sensor. However, a guide wave is provided with the characteristic of long range propagation in the axis direction of a pipe, so it is possible to detect many defects over a large pipe area at once. At present, there is a technique to generate a guide wave using a piezoelectric element (PZT). Such a transducer has some difficulties in industrial applications, which requires a high viscosity couplant. Therefore, we tried to develop a guide wave inspection system that uses an electromagnetic ultrasonic transducer (EMAT) which does not require any couplant. First, we confirmed that a guide wave can be transmitted and received in an aluminum pipe by a polarized shear horizontal transverse wave-EMAT, and we have confirmed the most suitable transmission and reception EMAT's specification and the most suitable drive conditions to generate the L, T and F-mode guide waves. Finally, the detection performance has been evaluated by the developed system.

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Generation and Detection of Longitudinal Wave in Steel Wires by Electromagnetic Acoustic Transducers.

Cited by 7 publications

References 0 publications

Pipe inspection system by guide wave using a long distance waveguide

Pipe inspection system by guide wave using a long distance waveguide

A New Guide Wave Inspection System Using Three Polarized Transverse Wave EMATs without Any Couplant

Pipe inspection system using a polarized transverse wave EMAT

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