时间反转导波激励板卡的设计及实现  

Design and Implementation of Excitation Board of Time Reversal Ultrasonic Guided Wave

作　　者：何存富[1] 周进节[1] 郑阳[1] 吴斌[1] 

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124

出　　处：《北京工业大学学报》2013年第1期25-30,37,共7页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(10772009);浙江省交通运输厅科技计划资助项目(2009H23)

摘　　要：为解决时反导波的激励问题,设计并实现了一种适合激励压电换能器产生时反导波的高电压激励板卡.在时反激励板卡的设计过程中,采用交互式状态机实现时反特征信号的快速合成,采用运放电路实现功率输出级电路的驱动,采用差分结构实现高压时反导波输出电路,以保证在实际检测过程中该激励板卡能根据检测要求快速生成所需要的高压时反导波.实际检测结果表明,该激励板卡不仅能驱动压电换能器产生用于常规超声导波检测所需要的窄带高压激励脉冲,还能产生时反检测所需要的高压时反导波.To solve the problem of exciting time reversal guided waves, a high-voltage excitation board, which was suitable to excite piezoelectric transducer for generating time reversal guided waves, had been designed and implemented. During the design of excitation board, the interacting FSM model was used to synthesize the time reversal signal, amplifier circuit was used to drive high-voltage output stage, and differential structure was employed to realize the high-voltage output stage of exciting board, which ensured high-voltage time reversal wave could be quickly generated in the detection process. Experiment results present that the excitation board generated not only ultrasonic guided waves for the conventional detection, but also the required high-voltage time reversal waves for the piezoelectric transducer, which make sure time reversal technology can used for engineering applications.

关 键 词：超声导波 时反聚焦 激励板卡 

分 类 号：TB51[理学—物理]