电磁导波能量压缩式脉冲激励方法研究

Research on impulse excitation method of electromagnetic guided wave by energy compression

电磁导波检测技术因其非接触耦合特性而被广泛应用于各种类型金属管道的损伤检测,但较低的激发效率却导致电磁导波信号能量传递范围有限,限制了其在长管道和结构复杂管道方面的应用。为提高电磁导波换能效率,本文摒弃了脉冲发生器和功率放大器相组合的激励源结构,提出了一种以能量压缩原理为核心的脉冲激发方法,在空间和时间上压缩存储于电容中的能量来提高激发信号强度,并确定了脉冲形成回路参数的选取规则。实验证明该方法可以有效增加电磁导波激发信号幅值。

As a result of contactless coupling, electromagnetic guided wave detection technology is used extensively to detect various metallic pipelines, however, low excitation efficiency declines range of energy transfer and application of long or complex structure pipe. In order to electromagnetic guided wave excitation efficiency, this paper proposes impulse excitation method based on energy compression stead of combination between impulse generator and power amplifier, which can improve signal strength after compressing energy stored in capacitance at space and time, and analyze parameter option rule about impulse generation loop. At least, the experiment proves this method can improve excitation signal amplitude.