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首页> 外文会议>4th European Conference on Underwater Acoustics Vol.1, Sep 21-25, 1998, Rome, Italy >MEASUREMENTS OF NEAR BED CURRENT PROFILES USING COHERENT DOPPLER AND CROSS-CORRELATION TECHNIQUES
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MEASUREMENTS OF NEAR BED CURRENT PROFILES USING COHERENT DOPPLER AND CROSS-CORRELATION TECHNIQUES

机译：相干多普勒和互相关技术测量近床电流分布

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摘要

Two different methods using acoustics have been developed to measure velocity profiles of flow with high resolution. One system, CDVP, used coherent Doppler methods, and measures the phase shift in the backscattered sound between transmissions. The other, CCVP, used the backscattered sound to obtain profiles of sediment concentration, and measured the time taken for the sediment structures to advert between two transducers using correlation methods. Data from both systems have been compared with that from a laser Doppler velocimeter, and showed excellent agreement. The CDVP provides velocities in line with the transducer beam, and operated satisfactorily providing 14 Hz velocity samples. The CCVP provides velocity profiles normal to the transducer beam, and in the direction of the line between the two transducers. The CCVP gave excellent results with steady flows, with the data averaged over 60 s. Further work is in progress to assess its response at shorter time scales.
机译：已经开发出两种使用声学的不同方法来高分辨率测量流量的速度分布。一种系统CDVP使用了相干多普勒方法，并测量了两次发射之间反向散射声音的相移。另一个CCVP使用后向散射声获得沉积物浓度曲线，并使用相关方法测量沉积物结构在两个换能器之间吸附所需的时间。两种系统的数据都与激光多普勒测速仪的数据进行了比较，并显示出极好的一致性。 CDVP提供与换能器光束一致的速度，并令人满意地提供14 Hz的速度采样。 CCVP提供垂直于换能器光束并沿两个换能器之间的直线方向的速度曲线。 CCVP在流量稳定的情况下给出了出色的结果，平均数据超过60 s。正在进行进一步的工作以评估其在较短时间范围内的响应。

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