中文摘要：

基于超声导波无损检测技术,发展了一种用于小口径管网实时检测的新型诊断系统.系统包括以压电陶瓷晶片为敏感器件的柔性传感器阵列,导波激励接收硬件子系统及分析软件.柔性传感器阵列能表面贴装于任意尺寸的管线外壁,并可在管线中激励和接收轴对称模态导波.与现有导波激励接收系统不同,诊断系统包含有多通道的信号转换开关矩阵,能实现管网中不同管线检测所需信号通道的快速自动切换.检测实验表明,分析软件能有效辨识大于3％管线横断面积的腐蚀损伤,并能实时检测管线的状态变化,如腐蚀损伤扩展等.诊断系统具有检测效率高,使用灵活的特点,为小口径管网的实时检测提供了有效手段.

英文摘要：

A novel diagnostic system for the real-time inspection of small tubes network was developed based on ultrasonic guided wave NDT technology.The diagnostic system consists of a flexible transducer array which employs piezoelectric ceramic as the sensitive element,guided wave excitation/receiving hardware subsystem and data analysis software.The flexible transducer array can be surface-mounted in a ring of any size tube＇s outer wall,and be able to excite and receive axial-symmetric guided waves in tubes.Difference from existing inspection system,the new diagnostic system contains multi-channel switch matrix which used for rapid automatic switching the needed signal channels for different tubes inspection.Experimental data shows that the analysis software can identify corrosion damages with more than 3 ％ of the total cross-sectional area of the tubes effectively,and be able to real-time detection state changes of the tubes,such as corrosion damage extension.The diagnostic system has the advantages of high efficiency and flexibility,and provides an effective means for the real-time inspection of small tubes network.