The Lateral Resolution of Three-Dimensional Underground Imaging by Using Amplitude Correlation Synthesis Processing Method

Tao, Liang; Motooka, Seiichi

doi:10.1143/jjap.46.4589

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…Detection of scatterers is useful in safety inspections of structures. [1][2][3][4][5] In particular, detection of cracks is critically important to satisfy the reliability requirements of infrastructure and industrial materials. Crack depths can be measured by ultrasound if they are open, 6,7) since the ultrasound is strongly scattered at open parts, e.g., tips or edges of cracks, with an air gap between crack faces.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Evaluation of Closed Cracks Using Subharmonic Phased Array

Ohara

Yamamoto

Mihara

et al. 2008

jjap

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We developed a novel imaging method, subharmonic phased array for crack evaluation (SPACE) based on subharmonic waves and a phased array algorithm, to measure closed-crack depth in the thickness direction. This implementation of SPACE used a LiNbO3 single-crystal transmitter to generate the intense ultrasound required for subharmonic generation and a phased array sensor as a receiver for focusing using delay laws. We applied SPACE to closed fatigue and stress corrosion cracks and found that the measurement error of SPACE in measuring crack depths was approximately 1 mm, while that in the conventional method was 20 mm in an extreme case. To establish the basis of SPACE, we propose the concept of localized subharmonic resonances (LSRs) and explain SPACE images as accumulations of LSRs. As an example of LSR, the Rayleigh-mode resonance of a crack is described. The similarities and differences between subharmonic waves at closed cracks and at microbubbles are also discussed.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Evaluation of Closed Cracks Using Subharmonic Phased Array

Ohara

Yamamoto

Mihara

et al. 2008

jjap

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“…[126][127][128][129]132,133,[191][192][193][194][195][196][197][198] In addition, buried objects and the distribution of soil properties have been visualized as examples of underground measurements. 143,185,[199][200][201][202][203][204][205][206][207] …”

Section: Transmittermentioning

confidence: 99%

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

Mizutani¹,

Wakatsuki²,

Ebihara³

2016

Jpn. J. Appl. Phys.

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Measurementthe act of measuring physical properties that we performhas the potential to contribute to the successful advancement of sciences and society. To open doors in physics and other sciences, various measurement methods and related applications have been developed, and ultrasound has remained a useful probe, power source, and interesting measurement object for the past two centuries. In this paper, we first summarize the basic principles of ultrasound from the viewpoint of measurement techniques for readers who just have started studying or are interested in the field of ultrasonic electronics. Moreover, we also introduce recent studiesultrasonic properties of materials, measurement techniques, piezoelectric devices, nonlinear acoustics, biomedical ultrasound, and ocean acousticsand their trends related to measurement techniques in ultrasonic electronics to provide some ideas for related applications.

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“…Moreover, an amplitude correlation synthesis processing (ACSP) method was proposed for acquiring images with little error and high resolution from received signals with low SNR [3][4][5][6] . Up to now, the efficiency of the proposed imaging method, the lateral resolution and detecting ability, and the arrangement of receivers array for three-dimensional imaging, has been studied respectively.…”

Section: Introductionmentioning

confidence: 99%

A study on the effect of sound velocity estimation for underground imaging

Toh¹,

Sakuma²,

Motooka³

2013

Proceedings of Meetings on Acoustics

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An efficient technique for detecting objects buried underground is expected for archaeological exploration and civil engineering. We have proposed a three dimensional underground imaging method by using an amplitude correlation synthesis processing and an electromagnetic induction type sound source. Because the sound velocity of sand and soil depends on a lot of physical parameters that varies with the area, it is needed to be measured before imaging processing. Up to now, the sound velocity employed for signal processing is measured by receivers buried underground near the area to be detected. In order to improve the efficiency of field detection, a method of estimating the underground sound velocity by the sound velocity measured from the ground surface is studied. In this study, the comparison experimental results of the velocity of underground transverse wave, the velocity of underground longitudinal wave, and the sound velocity measured from the ground surface are introduced. Furthermore, the effect on the image of underground objects brought forth by the sound velocity estimation is discussed.

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The Lateral Resolution of Three-Dimensional Underground Imaging by Using Amplitude Correlation Synthesis Processing Method

Cited by 13 publications

References 10 publications

Ultrasonic Evaluation of Closed Cracks Using Subharmonic Phased Array

Ultrasonic Evaluation of Closed Cracks Using Subharmonic Phased Array

Introduction of measurement techniques in ultrasonic electronics: Basic principles and recent trends

A study on the effect of sound velocity estimation for underground imaging

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