基于LabVIEW的电磁涡流阻抗信号的分析与显示

基于 LabVIEW 的电磁涡流阻抗信号的分析与显示基于 LabVIEW 的电磁涡流阻抗信号的分析与显示摘 要电磁涡流检测方法是无损检测的主要方法之一，用于检测导电性材料，无需耦合，检测起来十分方便并能节省时间。本人的毕业设计是与另外一个同学合作设计出一个六组差分探头的电磁涡流探伤仪器。本人的主要任务是软件部分，即利用 LabVIEW 设计出一套可用于六组差分探头电磁涡流探伤仪器的信号的分析与显示的程序。本次毕业设计的探头部分将使用六组电感线圈和 ADG508ACJZ 多路复用芯片以及 AD620 放大芯片构成一个六组差分探头，其中 AD620 放大芯片做前置放大器；之后利用 MFLI 锁相放大器和数据采集卡进行信号的提取与 A/D 转换；最后利用基于 LabVIEW 软件的编程对数字信号进行分析与显示。关键词：虚拟仪器；LabVIEW ；差分探头；涡流检测Analysis and Display of Electromagnetic Eddy Current Impedance Signal based on LabVIEWAbstractElectromagnetic eddy current testing is one of the main methods of nondestructive testing. It is used to detect conductive materials without coupling. It is very convenient and can save time. My graduation project is to design an electromagnetic eddy current flaw detection instrument with six groups of differential probes in cooperation with another student. My main task is the software part, that is, using LabVIEW to design a set of programs that can be used to analyze and display the signals of six groups of differential probe electromagnetic eddy current inspection instruments.The probe part of this graduation project will use six groups of inductance coils, ADG508ACJZ multiplexing chip and AD620 amplifier chip to form a six groups of differential probes, in which the AD620 amplifier chip is used as a preamplifier. After that, MFLI phase-locked amplifier and data acquisition card are used to extract and A/D convert signals. Finally, the program based on LabVIEW software is used to analyze and display the d...