目前,电磁导波检测系统的激励源大都采用重复电流脉冲群+高频大功率放大器输出大电流脉冲的方式,由于这种电流脉冲是连续的,平均功耗较大,成本高,不利于系统的简单化和实用化;通过电路分析和电路参数的优化选取,给出了电容储能放电产生孤立电流脉冲群作为电磁导波激励信号的新方法,整个系统设计简单,无需功率放大器放大,成本大为降低;实际放电波形表明:这种激励信号瞬时电流很高,能达到重复脉冲群激励信号的3倍以上,完全满足实际电磁导波检测要求.%The excitation resource of the electromagnetic guide wave detection system almost adopts the way of repeated current pulse group + high frequency and high power amplifier. That is a way which has continuous current pulse and high power consumption and high cost. A new way has been provided by circuit analysis and the optimal select of circuit parameter. The excitation resource of the electromagnetic guide wave is isolated current pulse group by capacitance energy storage and discharge. The system has the characteristic of simple and without power amplifier and low cost. The real discharge wave shows that this excitation signal has high instantaneous current and 3 times than that of repeated pulse group and the best demand for real electromagnetic guide wave detection.
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