基于混凝土的时间反转理论基本特性研究

Research on the Basic Characteristics of Time Reversal Theory Based on Concrete

混凝土结构内部复杂的环境易导致传统检测技术无法有效提取目标特征,致使采集的数据难以分析和解释,严重影响结构的损伤识别。为研究时间反转技术在混凝土介质中的基本特性,依据导波理论通过试验分析时间反转技术系统性能(信号稳定性、信号输入与输出关系、系统灵敏性)在混凝土介质中的适用性。研究结果表明,不同中心频率的聚焦信号波动范围在±4%以内具有很好的稳定性,低频下系统灵敏度更高,受外界干扰越强。

The complex internal environment of concrete structures can easily lead to the inability of traditional detection techniques to effectively extract target features,which makes the collected data difficult to analyze and interpret and seriously affects structural damage identification.In order to study the basic characteristics of time reversal technology in concrete media,the applicability of time reversal technology system performance(signal stability,relationship of signal input and output,system sensitivity)in concrete media is analyzed through experiments based on guided wave theory.The research results show that the focus signal with different center frequencies has good stability within a fluctuation range of±4%,and the system has higher sensitivity at low frequencies and is more susceptible to external interference.