2022
DOI: 10.1007/978-3-031-15758-5_112
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Preliminary Numerical Simulation for the Development of a Seismic Camera

Abstract: The acoustic camera is an established and highly effective device for localising acoustic sources by the use of a number of simultaneously acquired signals from an array of pressure sensors (microphones). The acoustic camera essentially provides for a highly directional sensor in which the signals arriving from the noise source in the steered main beam of the array are highly amplified relative to the background noise, which arrives at the camera from all directions outside the main beam and is therefore suppr… Show more

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Cited by 2 publications
(4 citation statements)
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“…From the beginning of the past decade, further studies on the response of buried fluid-filled pipes due to leak type excitation have been carried out to develop analytical expressions to predict the fluid-borne wavenumber, as an auxiliary tool to the correlation techniques [17]. It was established that the axisymmetric fluid-borne wave is excited by pressure waves in the fluid within the pipe, and it is the main carrier of leak noise energy along the pipe, which wave speed is highly affected by the shear modulus of the soil [11]. Moreover, the fluid-borne wave might radiate energy into the surrounding medium given that the wavenumber of the body waves in the medium are higher than the fluid-borne wavenumber.…”
Section: Wave Propagation Modelmentioning
confidence: 99%
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“…From the beginning of the past decade, further studies on the response of buried fluid-filled pipes due to leak type excitation have been carried out to develop analytical expressions to predict the fluid-borne wavenumber, as an auxiliary tool to the correlation techniques [17]. It was established that the axisymmetric fluid-borne wave is excited by pressure waves in the fluid within the pipe, and it is the main carrier of leak noise energy along the pipe, which wave speed is highly affected by the shear modulus of the soil [11]. Moreover, the fluid-borne wave might radiate energy into the surrounding medium given that the wavenumber of the body waves in the medium are higher than the fluid-borne wavenumber.…”
Section: Wave Propagation Modelmentioning
confidence: 99%
“…These techniques have been investigated in depth, for example by [3][4][5] and are well established, especially for metallic pipes. The technique performs well for a range of situations; however, it is limited by high wave attenuation in polymeric pipes, which are widely used in water distribution systems nowadays, and by the estimation of the leak noise velocity, which is also highly dependent on the pipe material and geometry, and the surround medium (soil properties) [11,12].…”
Section: Introductionmentioning
confidence: 99%
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“…The time delay, together with knowledge of the leak noise velocity, are used to estimate its position. More recently, ground vibration measurements have been used to detect shallow objects [8] and leaks in a buried pipe [9], using contact sensors. Furthermore, cameras have also been used to measure the mechanical response of vibratory systems [10,11].…”
Section: Introductionmentioning
confidence: 99%