红外无损检测在面向等离子体部件检测的应用

摘要

建立了主动式内热源激励的红外无损检测平台，并进行了不同缺陷大小的EAST W/Cu 面向等离子体部件(PFC)的无损检测实验(NDT)，得到试件表面的红外热图。通过最大温差值融合法消除由试件表面发射率不均匀引起的温度误差，通过快速离散傅里叶变换法提高了图像的信噪比，实现了对W/Cu面向等离子体部件缺陷的分辨。通过数值模拟的手段对可能影响该检测技术的关键因素进行了定量分析。%Active infrared thermography test facility was established, non destruction testing (NDT) experiments of EAST W/Cu PFC with different artificial defects size are conducted and infrared thermography imaging is obtained. Surface temperature error of the specimens caused by emissivity can be eliminated by maximum temperature difference reconstruction method, and fast discrete Fourier transform method can increase the ratio of signal to noise and realize defects distinguish. The key factors that may affect this infrared NDT method are discussed by mean of numerical simulation.