光热辐射技术测量钴涂层热学参数及厚度  

Thermal parameters and thickness measurement of cobalt coating using photothermal radiometry

作　　者：吴恩启[1] 徐紫红 GUO Xin-xin 

机构地区：[1]上海理工大学机械工程学院,上海200093 [2]多伦多大学扩散波先进技术中心

出　　处：《光电子．激光》2015年第8期1543-1548,共6页Journal of Optoelectronics·Laser

基　　金：国家科技支撑计划(2015BAK16B00)资助项目

摘　　要：为获得涂层材料特性,使用光热辐射(PTR)技术进行无损检测,并提出一种基于一维三层PTR理论模型的标定方法,完成了对Al基体钴涂层热学参数、厚度及分布的检测。三层PTR理论模型,由涂层、空气缺陷层和基体组成。搭建了实验平台,对两种不同厚度的钴(Co)涂层Al基体样品、无涂层Al基体参考样品进行了多点PTR测量。利用参考样品对带涂层样品PTR相位信号进行规格化,以消除检测系统的影响。通过多参数优化算法,对规格化后相位信号进行拟合,完成三层理论模型公式热参数的标定,求出了涂层材料的热传导率和热扩散系数,进而计算得到各检测点涂层厚度及分布。实验结果验证了理论模型的正确性,以及材料作为基体和涂层时其热学性能的值会发生改变。Abstract.In order to obtain characterization of coating material, the modulated photothermal radiometry （PTR） which is non-destructive and contactless is use＆ A one-dimensional photothermal radiometry model of a three-layered system is established to measure the thermophysical parameters, thickness and its distribution of coatings on aluminum substrates. The three layers are coating, air gap and substrate, respectively. Measurement instrument is set up and three samples are tested,two of which are aluminum substrates with cobalt coatings with different thicknesses, and one is pure aluminum. Then multi-point detections are processed for each sample. The normalized PTR phase signals are obtained by the normal- ization procedure between the experimental samples and the reference sample, aiming at eliminating the influence of detection system. A multi-parameter fitting optimization algorithm is used to acquire the thermal conductivity and diffusivity of the coating material. Then the thickness of each detected point and the thickness distribution of each experimental sample are obtained based on the previous work. The ex- perimental results show that the theoretical model is reasonable, and it also confirms the conclusion that the values of the thermal conductivity and diffusivity of the material as coating are much lower than those in literature. The thermophysical properties of coating are typically different from those of bulk materials.

关 键 词：测量 光热辐射(PTR) 热扩散系数 热传导率 涂层厚度 

分 类 号：TN219[电子电信—物理电子学]