Determining Suspended Sand Size and Concentration from Multifrequency Acoustic Backscatter
Determining Suspended Sand Size and Concentration from Multifrequency Acoustic Backscatter
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从多频声学反向散射确定悬浮沙尺寸和浓度
DOI：
10.1121/1.407237
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发表时间：
1993
影响因子：
2.4
通讯作者：
A. Hay
中科院分区：
文献类型：
--
作者：
A. Crawford;A. Hay
提出了一种从三个工作频率下的同时后向散射声压幅值中提取悬浮泥沙粒径和浓度的反演算法。该算法基于不同频率对之间的信号幅度差异，并使用湍流泥沙携带射流的多频后向散射的实验室测量值进行测试。从现场和实验室数据反演的浓度和尺寸分布进行了比较，从以前开发的算法的基础上的信号比的结果。差分反演方案对由低信号电平引起的误差不太敏感，允许尺寸/浓度测量范围扩展到较低浓度的区域。从现场数据的浓度同意与独立的光学确定的估计。结果表明对反向散射形状因子的敏感性。
An inversion algorithm for extracting suspended sand size and concentration from simultaneous backscattered acoustic pressure amplitude at three operating frequencies is presented. The algorithm is based on the differences in signal amplitude between different frequency pairs, and is tested using laboratory measurements of multifrequency backscatter from a turbulent sediment‐carrying jet. Concentration and size profiles inverted from field and laboratory data are compared with results from a previously developed algorithm based on signal ratios. The difference inversion scheme is less sensitive to errors arising from low signal levels, allowing the size/concentration measurement range to be extended to regions of lower concentration. The concentrations from the field data agree well with independent optically determined estimates. The results demonstrate sensitivity to the backscatter form factor.