Improvement of Underground Image (III): Underground Imaging Using Shear Waves

Yoshizumi, Natsuki; Sugimoto, Tsuneyoshi

doi:10.1143/jjap.40.3621

Cited by 9 publications

(7 citation statements)

References 3 publications

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“…However, the resolution of the image is not sufficient [96]. Accordingly, studies have been conducted to improve imaging of underground objects, by using a high-pass filter and peak position correction of received waves [104], adopting the envelope display method [105] and the deconvolution method [106]. As reported in [103], experimental work was carried out to validate the feasibility of the proposed method.…”

Section: Shear Wave Methodsmentioning

confidence: 99%

A Comprehensive Review of Acoustic Methods for Locating Underground Pipelines

et al. 2020

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Underground pipelines are vital means of transporting fluid resources like water, oil and gas. The process of locating buried pipelines of interest is an essential prerequisite for pipeline maintenance and repair. Acoustic pipe localization methods, as effective trenchless detection techniques, have been implemented in locating underground utilities and shown to be very promising in plastic pipeline localization. This paper presents a comprehensive review of current acoustic methods and recent advances in the localization of buried pipelines. Investigations are conducted from multiple perspectives including the wave propagation mechanism in buried pipe systems, the principles behind each method along with advantages and limitations, representative acoustic locators in commercial markets, the condition of buried pipes, as well as selection of preferred methods for locating pipelines based on the applicability of existing localization techniques. In addition, the key features of each method are summarized and suggestions for future work are proposed. Acoustic methods for locating underground pipelines have proven to be useful and effective supplements to existing localization techniques. It has been highlighted that the ability of acoustic methods to locate non-metallic objects should be of particular practical value. While this paper focuses on a specific application associated with pipeline localization, many acoustic methods are feasible across a wide range of underground infrastructures.

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Section: Shear Wave Methodsmentioning

confidence: 99%

A Comprehensive Review of Acoustic Methods for Locating Underground Pipelines

et al. 2020

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“…Therefore, we propose a method for the monitoring and imaging of the water content in the rooting zone of plants using sound vibration. 1) Shallow underground imaging using the sound wave vibration has been already performed, and there are techniques using a shear horizontal wave, [2][3][4][5][6][7][8][9][10] an electromagnetic sound source, [11][12][13][14] a giant magnetostriction vibrator, [15][16][17] and an air-borne wave [18][19][20][21][22] have been developed. However, no research in which irrigation is controlled by measuring the water distribution in the rooting zone of plants using sound vibration has been performed yet.…”

Section: Introductionmentioning

confidence: 99%

Study on Water Distribution Imaging in the Sand Using Propagation Velocity of Sound with Scanning Laser Doppler Vibrometer

Sugimoto

Nakagawa

Sügimura

et al. 2013

Jpn. J. Appl. Phys.

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We propose a method for the monitoring and imaging of the water distribution in the rooting zone of plants using sound vibration. In this study, the water distribution measurement in the horizontal and vertical directions in the soil layer was examined to confirm whether a temporal change in the volume water content of the soil could be estimated from a temporal changes in propagation velocity. A scanning laser Doppler vibrometer (SLDV) is used for measurement of the vibration velocity of the soil surface, because the highly precise vibration velocity measurement of several many points can be carried out automatically. Sand with a uniform particle size distribution is used for the soil, as it has high plasticity; that is, the sand can return to a dry state easily even if it is soaked with water. A giant magnetostriction vibrator or a flat speaker is used as a sound source. Also, a soil moisture sensor, which measures the water content of the soil using the electric permittivity, is installed in the sand. From the experimental results of the vibration measurement and soil moisture sensors, we can confirm that the temporal changes of the water distribution in sand using the negative pressure irrigation system in both the horizontal and vertical directions can be estimated using the propagation velocity of sound. Therefore, in the future, we plan to develop an insertion-type sound source and receiver using the acceleration sensors, and we intend to examine whether our method can be applied even in commercial soil with growing plants.

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“…An improved method which can estimate the location of the drill-bit in such situations is therefore required. In this context, although reflection-based methods [1][2][3][4][5][6][7][8][9][10][11][12][13] are commonly used for underground exploration, a direct method would be needed for this purpose. The aim of this study was therefore to measure the elastic wave generated by the drillbit underground by placing multiple sensors aboveground, and to establish an approximate three-dimensional (3D) drill-bit location method based on the difference between the arrival times of the elastic wave at each sensor.…”

Section: Introductionmentioning

confidence: 99%

A Method for Estimating the Location of the Drill-Bit During Horizontal Directional Drilling Using a Giant-Magnetostrictive Vibrator

Tamura

Kawamura

Mochiji³

et al. 2011

Jpn. J. Appl. Phys.

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We study the inflated phase of two-dimensional lattice polygons, both convex and column-convex, with fixed area A and variable perimeter, when a weight μ t exp[−Jb] is associated with a polygon with perimeter t and b bends. The mean perimeter is calculated as a function of the fugacity μ and the bending rigidity J. In the limit μ → 0, the mean perimeter has the asymptotic behaviour t /4 √ A 1 − K(J)/(ln μ) 2 + O(μ/ ln μ). The constant K(J) is found to be the same for both kinds of polygons, suggesting that self-avoiding polygons may also exhibit the same asymptotic behaviour.

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Improvement of Underground Image (III): Underground Imaging Using Shear Waves

Cited by 9 publications

References 3 publications

A Comprehensive Review of Acoustic Methods for Locating Underground Pipelines

A Comprehensive Review of Acoustic Methods for Locating Underground Pipelines

Study on Water Distribution Imaging in the Sand Using Propagation Velocity of Sound with Scanning Laser Doppler Vibrometer

A Method for Estimating the Location of the Drill-Bit During Horizontal Directional Drilling Using a Giant-Magnetostrictive Vibrator

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