基于LabVIEW的超声导波时间反转信号激励系统  

Time Reversal Signal Generator Applying for Ultrasonic Guided Wave Inspection

作　　者：邓菲[1] 

机构地区：[1]上海应用技术学院电气与电子工程学院,上海200235

出　　处：《上海应用技术学院学报（自然科学版）》2011年第3期248-252,共5页Journal of Shanghai Institute of Technology: Natural Science

基　　金：上海高校选拔培养优秀青年教师科研专项基金(YYY10020);上海应用技术学院引进人才科研基金(YJ2009-20)

摘　　要：将时间反转信号处理方法运用于超声导波无损检测时,可实现检测能量在缺陷位置的聚焦,从而提高缺陷反射回波信号的分辨率,增强检测效果。本文在LabVIEW环境下设计开发了基于NI PXI 5411信号发生器卡和NI PXI 5112数字示波器卡的时间反转信号激励系统,通过单传感器单独激励时间反转信号后再叠加的方式实现近似时间反转导波检测。实验表明,该激励系统能有效地解决时间反转导波检测过程中的信号激励问题,具有较好的应用价值。When ultrasonic guided wave is used for NDT, the time reversal technology redounds to make the inspection energy cocusina on the location of flaws, thereby it can enhance the resolution of echo and boost up the inspection effect. In this article, by utilizing the NI PXI 5411and NI PXI 5112, the time reversal signal generator is designed in the environment of LabVIEW. The time reversal signal generator produces the sine waves modulated by Hanning window to incite the transducer, and then re- ceive the defect echoes. Mter intercepting and time reversing these echoes, the time reversal signals are incited again to realize the time reversal guided wave inspection. The experiments proved that the time reversal signal generator can solve the problem of inciting the time reversal signals for guided wave inspection.

关 键 词：时间反转 虚拟仪器 超声导波 

分 类 号：TN911.23[电子电信—通信与信息系统] TP274[电子电信—信息与通信工程]