基于反射式脉冲红外热成像法的定量测量方法研究

The method of quantitative characterization using reflection pulsed thermography

本文提出了一种利用反射式脉冲热成像法测量缺陷深度、热扩散系数或缺陷界面热波反射系数的方法.首先,介绍了脉冲热成像法的基本原理以及定量测量算法.其次,利用304不锈钢制作了平底孔试件并预埋了四种不同物质并进行了实验,给出在不同条件下对缺陷深度、热扩散系数或缺陷界面热波反射系数测量的结果.实验结果显示实际测量值与其他方法测量值基本符合,误差范围在35%以内,并讨论了影响测量精度的原因.

In this paper, a new method using reflective pulsed thermography to measure detect depth, thermal wave reflection coetticient and thermal diffusivity is presented. First, a brief description of the pulsed thermography in terms of theoretical background and quantitative measurement is given. One stainless steel 304 structure machined several flat-bottom holes in which it is filled with different materials are used as experimental sample, the measured results of defect depth, thermal diffusivity and reflection coefficients at defect interface under different conditions are given. The agreement between the results obtained by using pulsed thermography and the value presented in the literature or measured by other techniques appears satisfactory within errors of q- 5%, and possible reasons for affecting the measurement precision are discussed.