Multifrequency acoustic measurement of concentration and grain size of suspended sand in water
作者:
Jan Schat,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1997)
卷期:
Volume 101,
issue 1
页码: 209-217
ISSN:0001-4966
年代: 1997
DOI:10.1121/1.418003
出版商: Acoustical Society of America
数据来源: AIP
摘要:
The paper describes an ultrasonic backscatter device for measuring vertical profiles of the concentration of suspended sand in water in the presence of air bubbles. The use of six frequencies permits a simultaneous measurement of the concentration of suspended sand, the grain size, and the concentration of air bubbles. For measuring in the near field of a transducer, the sensitivity of an ideal piston-like transducer in the near field is calculated and compared with measurements. A simple, but fast and efficient inversion algorithm to convert the backscattered intensities into sediment concentration and grain size is described. Measurements of known suspensions with concentration and grain size are presented, they exhibit a low error (20% rms) over a grain radius from 40 to 300 μm.In-situmeasurements of the concentration of suspended sediment in the surf zone are compared with the results of two optical backscattering sensors (OBS).
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