在很多应用场合需要4通道以上的示波器，但是市面上极大部分示波器*多只有四通道，而且没有外部输入的同步时钟接口。有什么快捷的方法获得更多通道功能的示波器？*简便的方法是:将两台示波器的辅助输入信号作为触发源，同时连接到相同的输入信号，每台示波器的另外四个通道都分别连接到不同的待测信号，这样两台示波器就近似于等效的“8通道”示波器。连接示意图如所示。两台示波器连接为近似8通道示波器有些示波器没有辅助输入通道，或者使用辅助输入通道不方便（辅助输入通道在示波器屏幕上没有显示），那么可以使用示波器的某个通道作为触发源，譬如两台示波器都用通道4作为触发源，那么两台示波器就可以同步成近似7通道示波器，连接示意如所示。
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PV028R1K1T1N001
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PV032R1K1T1NMRK
PV032R1K1T1NFFP
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PV032R1K4T1NMMC
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二维傅里叶变换Lamb波在时间和空间上都可以通过二维傅里叶变换转换为二维各个离散频率点的频率G波数能量谱,从而分解出单个Lamb波,并可对其幅值进行测量。单个波动组分在时间上的频度称为频率,而在空间(距离)上的频度称为波数.由频率波数谱中某个波动组分的频率和波数,可以确定周期和波长。通过对接收信号的二维傅里叶变换,与理论计算得到的波数G频率的频散曲线进行对比,从而确定检测信号中包含的Lamb波模态。
