宽带声学多普勒测流仪设计

Design of Broadband Acoustic Doppler Current Profiler

介绍一种利用宽带编码声信号进行水流流速测量的装置。当某一水层水团与测流仪之间有相对运动时,声波反射信号将产生相应的多普勒频移,从而可以得到两者之间的切向速度。为了计算其绝对速度,换能器采用了四波束结构。这里还介绍了用于相关接收的编码脉冲的形式和接收电路的结构。该装置适合江、湖、河口的流速、流量的测量。

A developing equipment for measuring current velocities using coded pulse broadband acoustic signal is introduced. As a transducer sends pulses of sound into water, its echo signal from the scatters in a specifically depth cell has a Doppler frequency shift proportionate to the relative velocity between the scatters and the trans- ducer, and a velocity component is got. This paper introduces the arrangement of four acoustic beams which em- anate from the transducer to get the absolute current velocities. The coded pulse for autocorrelation receival, and the architecture of receiving circuits were introduced too. The equipment is suitable for remotely measure current velocities in environments such as rivers, lakes and estuaries.