Calibrating multi-frequency acoustic backscatter systems for studying near-bed suspended sediment transport processes
Calibrating multi-frequency acoustic backscatter systems for studying near-bed suspended sediment transport processes
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DOI：
10.1016/j.csr.2007.07.007
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发表时间：
2008-02-01
影响因子：
2.3
通讯作者：
Cooke, Richard D.
中科院分区：
文献类型：
--
作者：
Betteridge, Kyle F. E.;Thorne, Peter D.;Cooke, Richard D.
在过去的二十年中，利用悬浮沉积物反向散射的声音来测量近床颗粒尺寸和浓度的分布，已越来越受到沉积学家和海岸工程师的接受和使用。为了从反向散射信号中获取沉积物参数，需要对信号进行反演，这需要系统校准。校准可以通过详细的声学和电子测量来进行，或者通过测量具有已知散射特性的悬浮液的反向散射来进行。在这里，我们探索后一种方法并详细描述三频声反向散射系统的校准。目的是为参与使用声学作为沉积物输送研究工具的沿海科学家提供校准过程的清晰阐述。使用不同粒径的玻璃球的悬浮液作为校准散射体。为了解释玻璃球悬浮液的信号反向散射，提出了一个简单的球体散射模型。结果表明，可以通过相对简单且鲁棒的方式获得一致的校准结果。 Crown 版权所有 (C) 2007 由 Elsevier Ltd 出版。保留所有权利。
The utilisation of sound backscattered from sediments in suspension, to measure profiles of near-bed particle size and concentration, has been gaining increasing acceptance and usage by sedimentologists and coastal engineers over the past two decades. To obtain the sediment parameters from the backscattered signal requires an inversion to be conducted on the signal and this necessitates a system calibration. The calibration can be carried out by detailed acoustic and electronic measurements, or alternatively by measuring the backscattering from suspensions with known scattering characteristics. Here, we explore the latter approach and describe in some detail the calibration of a triple frequency acoustic backscatter system. The aim is to provide coastal scientists involved in using acoustics as a tool for sediment transport research, with a clear exposition of the calibration process. Suspensions of glass spheres of varying particle size were used as the calibration scatterers. To interpret the signal backscatter from the suspension of glass spheres a simple model for sphere scattering is presented. The results show that consistent calibration results can be obtained in a relatively simple and robust manner. Crown Copyright (C) 2007 Published by Elsevier Ltd. All rights reserved.