基于热图序列时间特征的涂层厚度测量研究  

Research on measurement of coating thickness based on thermal image time characteristic

作　　者：陶胜杰[1] 杨正伟[1] 张炜[1] 王冬冬[1] 

机构地区：[1]第二炮兵工程大学602室,西安710025

出　　处：《仪器仪表学报》2014年第8期1810-1816,共7页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51275518;51305447);陕西省自然科学基金(2013JM7021)资助项目

摘　　要：为快速准确地测量涂层厚度,提出基于热图序列时间特征的红外热波技术测量方法。通过理论分析和仿真,得出涂层厚度的平方与热图序列的对数二阶微分峰值时间成正比关系,比例系数由涂层材料的热扩散系数确定,通过此关系可以测量出涂层厚度。在复合材料基体上制作了涂层试件,利用脉冲闪光灯作为激励源进行了热加载。热图显示不同厚度涂层有着明显不同的表面降温过程,涂层薄的区域降温快,冷却时间短。对热图序列进行平均、对数和二阶微分处理,计算了4块涂层的厚度和测量误差,分析了计算速度。结果表明基于热图序列时间特征的测量方法速度快,误差较小,能很好地应用于涂层厚度的快速、非接触测量。To measure coating thickness more efficiently and accurately,Infrared thermal wave technology based on thermal image time characteristic was proposed.The square of coating thickness is indicated to be proportional to the peak time of the logarithmic second derivation in thermal image sequence by theory analysis and simulation.The coefficient is determined by the coating’s heat diffusivity. The coating thickness can be calculated by the proportional relation.The coating sample based on composite material was made and the experiment was carried out using flash lamp as heat exciting source.Thermal image sequence shows that the coatings with different thick-ness have different cooling courses.The thinner the coating is,the more quickly it cools.The thermal image sequence was processed by taking the mean,logarithm and logarithmic second derivation.Coating thickness in four positions was measured rapidly and the error was calculated.Finally the computation time consumption was estimated.The results show that the coating thickness measurement based on thermal image time characteristic has greater efficiency and less error.It is fairly feasible to utilize infrared thermal wave technology in the rapid and non-touch measurement of coating thickness.

关 键 词：红外热波 涂层 厚度测量 热图序列 二阶微分 

分 类 号：TN219[电子电信—物理电子学] TH7[机械工程—仪器科学与技术]