基于电驻波的锚杆长度无损测量方法

摘要

For common non-destructive measurement methods of anchor stock have problem that vibration wave can't couple well with the anchor stock,the paper proposed a new non-destructive measurement method of anchor stock legth based on electricity standing wave.The method is based on equivalent principle between transmission line and antenna,and uses standing wave theory of transmission line to measure length of metal anchor stock,that is,scan input signal frequency,when the first minimum voltage of the anchor stock appears,the corresponding signal wavelength is 4 times of anchor stock length,and the anchor stock length can be calculated.The measured result shows that the method has convenient coupling and good measurement result.%针对现有锚杆无损检测方法存在振动波与锚杆的耦合问题,提出了一种基于电驻波的锚杆长度无损测量方法.该方法基于传输线和天线等效原理,采用传输线上的驻波理论来测量金属锚杆长度,即扫描输入信号频率,当锚杆始端第1次出现电压最小值时,认为对应的信号波长为锚杆长度的4倍.实测结果表明,该方法耦合方便,测量效果好.