On the use of power reflection ratio and phase change to determine the geometry of a blockage in a pipe
On the use of power reflection ratio and phase change to determine the geometry of a blockage in a pipe
复制标题
DOI：
10.1016/j.apacoust.2014.07.002
复制
发表时间：
2015-01-01
影响因子：
3.4
通讯作者：
Horoshenkov, Kirill V.
中科院分区：
文献类型：
--
作者：
Duan, Wenbo;Kirby, Ray;Horoshenkov, Kirill V.
通过沿管道向下发送声学信号并测量来自堵塞物的回声，可以检测管道中的堵塞物。这提供了一种快速有效的确定堵塞存在的方法，这种方法现在被用于例如探测下水道系统的完整性。在这篇文章中，提出了一种方法，用于获得的长度和等效的横截面积的堵塞物，仅使用一个单一的麦克风捕获的入射和反射脉冲。所提出的方法使用由阻塞引起的入射声信号和反射声信号之间的相位变化，以及每个脉冲的幅度的差异，来生成两个独立的方程，从该方程可以恢复阻塞的面积比和长度。这需要在管道的平面波区域中进行测量，然而，它表明，通过在频域中的每个信号的适当处理的面积比和长度的一个相对较大数量的堵塞可以成功地恢复。(C)2014爱思唯尔有限公司版权所有。
Blockages may be detected in pipes by sending acoustic signals down the pipe and measuring the echo from the blockage. This presents a fast and efficient way of determining the presence of a blockage and this method is now being used, for example, to probe the integrity of sewer systems. In this article a method is presented for obtaining both the length and the equivalent cross-sectional area of a blockage using only a single microphone to capture the incident and reflected pulse. The method presented uses the change in phase between the incident and reflected acoustic signals caused by a blockage, as well as the difference in the amplitude of each pulse, to generate two independent equations from which the area ratio and the length of the blockage may be recovered. This requires measurements to be carried out in the plane wave region of the pipe, however it is shown that through appropriate processing of each signal in the frequency domain the area ratio and length of a relatively large number of blockages can be successfully recovered. (C) 2014 Elsevier Ltd. All rights reserved.