排水管道声呐成像检测中换能器阻抗匹配技术研究

Research on transducers impedance matching technology in sonar imaging detection of drainage pipelines

针对目前声呐检测信号易震荡拖尾、电声能量互换效率低和排水管道声呐检测图像难以分辨等问题,着重研究导致这些问题的收发一体声呐换能器阻抗匹配核心技术,从声呐换能器等效电路建模、阻抗匹配网络设计和电路实现并测试三个方面进行了详细分析。对加入阻抗匹配电路前后的声呐换能器测试结果进行了对比分析,结果表明,所设计的阻抗匹配电路简单有效,声呐成像图像清晰,并且声呐成像检测结果定量分析误差率低,被测试物体长度、宽度和对角线距离的声呐检测量误差率分别为1.04%、1.71%和1.37%,符合最新的行业技术标准。研究成果能够提升排水管道病症检测的能力,对城市内涝灾害防治具有重要意义。

In allusion to the current problems of sonar detection signals being prone to oscillation and tailing,low efficiency of electroacoustic energy exchange,and difficulty in distinguishing sonar detection images in drainage pipelines,the core technology of impedance matching for integrated sonar transducers is researched emphatically,and the detailed research was conducted from three aspects:equivalent circuit modeling of sonar transducers,impedance matching network design,and circuit implementation and testing.The comparative analysis was conducted on the testing results of sonar transducers before and after the addition of impedance matching circuits.The results show that the designed impedance matching circuit is simple and effective,the sonar imaging images is clear,and the quantitative analysis error rate of sonar imaging detection results is low.The error rates of sonar detection quantities for the length,width,and diagonal distance of the tested object are 1.04%,1.71%,and 1.37%,respectively,which met the latest industry technical standards.The research findings can improve the detection ability of drainage pipeline diseases,which is of great significance for the prevention and control of urban waterlogging disasters.