Tonge, AS, Peakall, J, Cowell, DMJ et al. (3 more authors) (2021) Experimental validation of acoustic inversions for high concentration profiling of spherical particles, using broadband technology in the Rayleigh regime. Applied Acoustics, 180. 108100. ISSN 0003-682X
Abstract
In this study, an acoustic backscatter system was used with single broadband transducers utilising narrowband excitation at multiple frequencies of 2.00, 2.25 and 2.50 MHz, to determine the scattering properties of three sizes of glass particles (40, 78 and 212 µm) in liquid suspensions. A calibration procedure was developed to initially measure the transducer constants, and form function and scattering cross-section values were calculated experimentally. Determined values aligned well with theoretical predictions, where viscous absorption was found to be important for the smallest glass particle size. A logarithmic translation of the signal attenuation gave a linear response, with respect to concentration, up to a maximum measured concentration of 125 gl−1 for the two smallest glass species. However, attenuation data for the largest species were only linear up to ~ 40 gl−1, attributed to significant multiple particle scattering causing an increase in the noise floor. Additionally, a procedure was developed to fit measured attenuation data to a nearfield correction factor correlation, improving measurements in restricted geometries and highly attenuating suspensions. Concentration profiles were produced using both single and dual frequency inversion methods and were found to be accurate up to ~ 25–40 gl−1, after which multiple scattering effects caused errors in the measured backscatter, and instability in the inverted profiles. Additional scatter observed in the dual frequency inversions was modelled in terms of the ratio between the attenuation coefficients at each frequency and compared to the experimental error. A ratio < 0.6 between the attenuation coefficients is suggested to sufficiently minimise errors in the dual frequency inversion.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 Elsevier Ltd. All rights reserved. This is an author produced version of an article published in Applied Acoustics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Acoustic backscatter; Suspensions; Sediment; Particle characterisation; Concentration measurement; Rayleigh scattering |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 May 2021 14:04 |
Last Modified: | 23 Apr 2022 00:38 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.apacoust.2021.108100 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:173579 |
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Filename: (Tonge et al)_Author Accepted Manuscript_Applied Accoustics_2021.pdf
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