Experimental validation of acoustic inversions for high concentration profiling of spherical particles, using broadband technology in the Rayleigh regime

Tonge, Alastair S.; Peakall, Jeff; Cowell, David M. J.; Freear, Steven; Barnes, Martyn; Hunter, Timothy N.

doi:10.1016/j.apacoust.2021.108100

Cited by 3 publications

(17 citation statements)

References 60 publications

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“…The gradient of G versus distance (d G /d r ) was extracted at intermediate distances (0.5–0.15 m) to enable the determination of the sediment attenuation coefficients (ζ) from d G /d r versus M , as summarized in Section . , For higher attenuating systems that encountered the noise floor within this distance range (e.g., certain 5 MHz data), a smaller distance of 0.05 to 0.1 m was used to estimate the gradient. Figure presents these concentration calibrations for flocculated calcite and BPS at all frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…The BPS also showed good levels of natural flocculation from existing biological polymeric material, without the addition of synthetic flocculation agents . Additionally, spherical glass powder, Honite 16 (Guyson Ltd., UK), with a median size ( d 50 ) of 78 μm and a low coefficient of variation (COV) of 0.21, was initially used to calibrate the acoustic transducer coefficients ( k t ), as utilized previously by the current authors …”

Section: Methodsmentioning

confidence: 99%

“…However, the optimal frequency pairing has not been comprehensively investigated. Previous work by the current authors considered pairings of 2–2.5 MHz (from single broadband transducers) . Here, a wider range of frequency pairings is investigated, for three probes with central frequencies of 1, 2.25, and 5 MHz.…”

Section: Acoustic Backscatter Theorymentioning

confidence: 99%

“…A calibration following the G-function method is also given by Bux et al 39 and Tonge et al 34 for finding the transducer constant, k t , and the scattering constant, k s . Once the attenuation coefficient, ξ, is known, k t can be estimated at known low or intermediate concentrations for well characterized monosized spherical particle systems via rearrangement of eq S1 into eq 4.…”

Section: G-functionmentioning

confidence: 99%

“…Additionally, inversion methods are increasingly being applied to derive mean size or concentration profiles, both for complex sediments in estuarine environments − and industrially, ,, using either a single frequency or dual-frequency inversion methods . The advantage of multifrequency methods are that they can reduce numerical instabilities in the far field. , However, a more complete understanding of the frequency ratio is required, and the concentration limitations of these inversions for flocculated systems are often unknown.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characterizing Flocculated Mineral Sediments with Acoustic Backscatter, Using Solid and Hybrid Scattering Models

Tonge,

Peakall,

Lockwood

et al. 2023

Ind. Eng. Chem. Res.

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This study investigated the performance of an acoustic backscatter system (ABS) for the in situ particle characterization of complex wastes. Two sediments were used: a fine, milled calcite that was flocculated with anionic polyacrylamide and naturally flocculated pond sludge. Particles were initially measured independently by light-based techniques to gain size, the coefficient of variation (COV), and fractal dimensions. For acoustic experiments, a bespoke, high-fidelity ABS was employed with 1, 2.25, and 5 MHz probes and a recirculating mixing tank. Initially, the concentration independent attenuation and backscatter coefficients were measured for each system using a robust calibration procedure at multiple concentrations. Comparisons of the total scattering cross-section (χ) and form function (f) were made between the experimental data and two semiempirical models: a Solid Scattering model and a Hybrid model (where the effects of bound fluid are incorporated). Experimental data compared more closely to the Solid Scattering model, as it was assumed scattering was dominated by small, bound “flocculi” rather than the macroscopic structure. However, if the COV was used as a fit parameter, the hybrid model could give equally accurate fits for a range of input aggregate sizes, highlighting that important size and structure information can be gained from the acoustic models if there is some a priori system data. Additionally, dual-frequency inversions were undertaken to measure concentration profiles for various frequency pairs. Here, the lowest frequency pair gave the best performance (with accurate measurements in the range of 2–35 g·L–1) as interparticle scattering was lowest.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Acoustic Backscatter Theorymentioning

confidence: 99%

Section: G-functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterizing Flocculated Mineral Sediments with Acoustic Backscatter, Using Solid and Hybrid Scattering Models

Tonge,

Peakall,

Lockwood

et al. 2023

Ind. Eng. Chem. Res.

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Concentration Profile Measurement of Liquid–Solid Two-Phase Horizontal Pipe Flow Using Ultrasound Doppler

Zhang

Dong

Tan

2023

IEEE Trans. Instrum. Meas.

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Insights into acoustic properties of seven selected triply periodic minimal surfaces-based structures: A numerical study

Lu,

Silva,

Alzaabi

et al. 2023

Journal of Low Frequency Noise, Vibration and Active Control

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Poly(methyl methacrylate)-based triply periodic minimal surfaces (TPMS) structures promise great potential in phononic applications, but the complicated TPMS structure induces a design challenge for controlling their properties. Numerical acoustic simulations of seven major PMMA-based TPMS lattice structures are presented for low-frequency sound attenuation applications while varying their relative density. Except for the local resonances in primitive and Neovius-based lattice structures, the acoustic properties of other TPMS structures show a common Bragg bandgap with a central frequency of around 435 Hz and a bandwidth of around 286 Hz, which results from multiple scattering of periodic unit cells. In contrast, the acoustic bandgaps of primitive and Neovius-based lattices have much smaller and larger complete bandgaps, respectively, which are mainly attributed to the local resonances in their geometric cavities with different sizes. Thus, by taking the mechanism of generated bandgaps in the TPMS-based lattice structures into consideration, we can design suitable bandgaps for acoustic applications in the specific frequency range.

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Experimental validation of acoustic inversions for high concentration profiling of spherical particles, using broadband technology in the Rayleigh regime

Cited by 3 publications

References 60 publications

Characterizing Flocculated Mineral Sediments with Acoustic Backscatter, Using Solid and Hybrid Scattering Models

Characterizing Flocculated Mineral Sediments with Acoustic Backscatter, Using Solid and Hybrid Scattering Models

Concentration Profile Measurement of Liquid–Solid Two-Phase Horizontal Pipe Flow Using Ultrasound Doppler

Insights into acoustic properties of seven selected triply periodic minimal surfaces-based structures: A numerical study

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