基于Labview的脉冲漏磁检测系统的研究

Research of Pulsed Magnetic Flux Leakage Testing System Based on Labview

摘要:

研究了一种脉冲信号激励的漏磁检测系统；利用USB数据采集卡I/O口输出脉冲方波信号经过功率放大环节生成激励信号,通过数据采集卡触发采样功能实现检测信号的同步采样；基于Labview软件搭建了漏磁检测虚拟仪器平台,实现了漏磁检测信号的采集、调理、储存、回放和分析功能；通过实验对加工有宽度为2 mm深度分别为2 mm、5 mm、10 mm的3个裂纹缺陷的钢样本进行检测,应用霍尔传感器检测漏磁场信号；检测信号经过调理和采集,在电脑中实时显示漏磁信号随时间的变化波形；通过分析回放采样信号的峰值和峰值到达时间评估缺陷的位置和深度；实验结果表明缺陷深度越大采样信号的峰值越大,峰值到达时间越长。

Abstract:

In this paper,pulsed magnetic flux leakage testing procedure based on the principle of pulsed magnetic flux leakage testing is written on software platform Labview to conduct non-destructive testing for ferromagnetic material defects which improves the reliability of materials. The procedure realizes the acquisition treatment storage review and analysis functions for magnetic flux leakage signals via the communication between USB and data acquisition card. Pulse signal coming from data acquisition card’ I/O port runs into power amplifier where it forms an excitation source. Synchronous sampling based on the excitation source is realized by data acquisition card through its trigger sampling function. The experiment identifies that the pulsed magnetic flux leakage testing platform can complete the testing mission on defect templates effectively with the advantages of high flexibility and simple hardware circuit.