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本文提出了一种反射式脉冲红外热波技术中采用对数温度-对数时间二阶微分极小峰值时间作为特征时间进行缺陷深度定量测量的方法.首先,介绍了反射式脉冲红外热波技术的基本原理,在半无限厚平板解的基础上得到了对数温度-对数时间二阶微分极小峰值时间与缺陷深度平方的关系式.其次,利用不锈钢和铝材料制作平底洞试件并得到红外热图序列,提取对数二阶微分极小峰值时间.该特征时间与缺陷深度平方实验结果显示其具有很好线性关系,该线性关系可用于实际缺陷深度定量测量,并讨论了与应用广泛的对数二阶微分极大峰值法相比的优缺点.
This paper presents a method of quantitatively measuring the depth of defects by using the second-order differential min-hour logarithmic temperature-logarithmic time as the characteristic time in reflective pulsed infrared thermal wave technology.First, the paper introduces the reflective pulsed infrared thermal wave technique , The relationship between the logarithm of temperature and logarithm time and the square of the depth of the defect is obtained on the basis of the semi-infinite plate theory.Secondly, the flat-bottomed cave specimens are made of stainless steel and aluminum The infrared heat map sequence was obtained and the second order logarithmic derivative peak time was extracted.The experimental results show that the characteristic time has a good linear relationship with the depth of the defect and the linear relationship can be used to quantitatively measure the actual depth of the defect, The advantages and disadvantages of a wide range of logarithmic second-order differential maximum-peak methods.