A method of measuring acoustic wave attenuation in the laboratory

Tang, Xiaoming; Toksöz, M. Nafi; Tarif, P.; Wilkens, Roy H

doi:10.1190/1.1892016

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Their work shows clearly that at short distances from the transmitting transducer, the attenuation values measured in pulse-echo method show wide variation. At long distances however, the results are consistent and it is possible to get an average value of 0.04417 np/cm for the attenuation constant though it is not in agreement with other reported values [3][4][5][6]. Their measurement in through-transmission method uses two transducers aligned face-to-face, parallel to each other.…”

Section: Resultsmentioning

confidence: 71%

“…It is observed that at relatively small distances from the transducer, α varies widely, while at large distances it is possible to obtain an average value of α. Moreover, the values of α obtained from pulse-echo and through transmission methods differ significantly and do not agree with other values reported in the literature [3][4][5][6]. The propagating-wave analysis of pulse-echo method [1] gives a satisfactory explanation for the variation.…”

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confidence: 79%

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Fourier Transform Ultrasound Spectroscopy for the determination of wave propagation parameters

Pal

2017

Ultrasonics

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Abstract:The reported results for ultrasonic wave attenuation constant (α) in pure water show noticeable inconsistency in magnitude. A "Propagating-Wave" model analysis of the most popular pulse-echo technique indicates that this is a consequence of the inherent wave propagation characteristics in a bounded medium. In the present work Fourier Transform Ultrasound Spectroscopy (FTUS) is adopted to determine ultrasonic wave propagation parameters, the wave number (k) and attenuation constant (α) at 1MHz frequency in tri-distilled water at room temperature (25 o C). Pulse-echo signals obtained under same experimental conditions regarding the exciting input signal and reflecting boundary wall of the water container for various lengths of water columns are captured. The Fast Fourier Transform (FFT) components of the echo signals are taken to compute k, α and r, the reflection constant at the boundary, using Oak Ridge and Oxford method. The results are compared with existing literature values.Keywords: Fourier Transform Ultrasound Spectroscopy (FTUS), Attenuation measurement, Propagating wave model 1. Introduction: Pulse-echo method is the standard method widely used for measuring the velocity (v) and attenuation constant (α) of ultrasonic waves for characterizing solid and liquid samples including biological systems. In a recent work [1], it has been reported that, this method is not reliable for accurate measurement of intrinsic attenuation constant α. In fact, a common experience of experimentalists working with attenuation measurement in solid and liquid samples is that, it is very difficult to obtain reproducible results for α. An elaborative illustration in this point is the work by Martinez et.al.[2] on pure water where both pulse-echo and through-transmission methods are used to measure α. It is observed that at relatively small distances from the transducer, α varies widely, while at large distances it is possible to obtain an average value of α. Moreover, the values of α obtained from pulse-echo and through transmission methods differ significantly and do not agree with other values reported in the literature [3][4][5][6]. The propagating-wave analysis of pulse-echo method [1] gives a satisfactory explanation for the variation. It shows that the echo amplitudes depend on α, the reflection coefficient r at the boundaries and the sample length l in a complicated way. As a consequence, the attenuation measured from the echo heights is an effective attenuation α e , different from the intrinsic attenuation α of the propagating medium. The dependence of α e on r was reported [7] in solid samples where the effect is more prominent due to the presence of the couplant used for bonding the transducer to the sample. We show that the intrinsic attenuation α along with r can be computed from the frequency spectrum of the pulse-echo signal using Oak Ridge and Oxford parameter fitting method [8]. This method has been used to determine α in tri-distilled water at room temperature (25 o C) at the transducer frequency 1 MHz....

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Section: Resultsmentioning

confidence: 71%

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confidence: 79%

Fourier Transform Ultrasound Spectroscopy for the determination of wave propagation parameters

Pal

2017

Ultrasonics

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“…The spectral ratio method Toks6z et al, 1979;Remi et al, 1994 was used to calculate the frequency dependent attenuation and the low frequency P-wave and s-wave velocity. As the reference standard we chose water with the same length as the samples to avoid geometric spreading effects (Tang et al, 1988). The spectrum UTej of the reference standard has been computed with half a cycle of the first arriving pulse where ATef is the amplitude spectrum, +Tej the phase, w the angular frequency, Kef the phase velocity and Lref the length of the reference standard.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Effects of pore fluids in the subsurface on ultrasonic wave propagation

Seifert

1998

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is an equal opportunity employer. I DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. The last study concentrates on the wettability of the grains and its effect on 3 elastic wave propagation and electrical resistivity. Experiments have been performed in both initally water-saturated and initally n-dodecane-saturated media, for water-wetting and n-dodecane-wetting sand, as a function of n-dodecane saturation. Changes in the wettability of a n-dodecane-water-mineral system affect the effective amplitude of the P-wave, the capability of measuring S-waves and the electrical resistivity.

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“…clay concentration), and these changes have little influence on the acoustic signal energy. At the same time, the elastic wave absorption Q f in the borehole fluid can vary significantly (Cheng, Toksöz and Willis ; Tang, Toksöz and Tarif ). The calculations performed have shown that the amplitudes of the packets of compressional and shear waves depend slightly on the absorption in the borehole fluid (Fig.…”

Section: Dependence Of the Borehole Acoustic Signal Energy On The Acomentioning

confidence: 99%

Energy of acoustic signals in a borehole

Markova

Jarillo

Markov

2019

Geophysical Prospecting

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In the present article, the dependencies of the acoustic signal total energy and the energies of the wave packets of different types of the waves on the elastic parameters and permeability of rocks have been studied. We have considered traditional logging tools containing acoustical monopole source. Calculations were performed in a frequency range of dozens of kilohertz, typical for acoustic well logging. It was shown that in a typical high‐velocity formation (vs > vf, where vs and vf are the velocities of the shear wave in the rock and of the compressional wave in the borehole fluid, respectively), the pseudo‐Rayleigh waves, whose elastic properties depend mainly on the shear modulus of the rock, contributed significant energy to the total signal energy in the borehole. The energies of different wave packets depend on the permeability in different ways. The greatest sensitivity to permeability change has been shown by the acoustic signal total energy and the energy of the low‐velocity part of the pseudo‐Rayleigh wave packet. The theoretical analysis was illustrated by real sonic log data.

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A method of measuring acoustic wave attenuation in the laboratory

Cited by 4 publications

References 6 publications

Fourier Transform Ultrasound Spectroscopy for the determination of wave propagation parameters

Fourier Transform Ultrasound Spectroscopy for the determination of wave propagation parameters

Effects of pore fluids in the subsurface on ultrasonic wave propagation

Energy of acoustic signals in a borehole

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