管道内检测器声定位技术研究

Research on Acoustic Localization Technology for PIG

根据当前对管道检测系统的需求,基于声学原理的管道地面标记技术已成为现今研究的热点与难点。创新地提出将一种高灵敏度、高信噪比的MEMS仿生声矢量传感器应用于管道内检测器的地面标记中。首先介绍了管道内检测器在管道中的发声机理和声音信号特征。由于声波的吸收系数与频率的平方成正比,所以在低频时,声波衰减小,传播更完整。针对单个声矢量传感器,经过仿真分析,单声矢量传感器具有良好的定向能力。最后,进行现场实验,绘制出定向角度表,验证了MEMS声矢量传感器应用于管道内检测器地面标记的可行性。

According to the current demands of the pipeline testing systems,the ground marker technology based on acoustics principle has become the research hotspot and difficulty currently. A new type of bionic acoustic vector sensor based on MEMS technology with high sensitivity and high SNR has been innovatively used for ground marker research. Firstly,the sounding mechanism and signal characteristic are introduced when pipeline inspection device works in pipeline. Because the absorption coefficient of sound wave is directly proportional to the square of the frequency,in the low frequency,damping is small and its spread is more complete. For single sensor,the simulation result has showed that the MEMS acoustic vector sensor has good directional ability. Finally, the experiment has been carried on at scene and the table of directional angle has been draw. And the feasibility of the MEMS acoustic vector sensor applied to the pipeline ground marker is verified.