光干涉法在彩涂板涂层厚度检测中的应用研究

Study on the application of optical interferometry in the measurement of coating thickness of color-coated plates

介绍光干涉法测定彩涂板涂层厚度的原理以及应用情况,分析了影响检测结果的几个因素:涂层折射率、波长范围和膜厚范围设定。其中彩涂板涂层折射率是关键影响因素,且该参数不可测量,提出了具体解决方法。将光干涉法和目前检测方法,包括千分尺法、磁性—涡流仪法等,进行测量系统分析和比对试验,结果表明:光干涉法重复性和再现性优于目前方法,且与目前方法经统计检验无显著性差异,可以应用于彩涂板涂层厚度的检测。

The principle and application of optical interferometry to measure the coating thickness of color-coated plates were introduced.At the same time,several factors affecting the test results,including coating refractive index,wavelength range and film thickness range setting,were analyzed.Among them,the refractive index of color coating which couldn’t be measured was the key factor.And a solution to this problem was proposed.Finally,the optical interference method and the current detection method including micrometer method,magnetic-eddy current method and so on,were analyzed and compared.The results showed that the optical interferometry had better repeatability and reproducibility than the current method,and had no significant difference with the current method through statistical test,so it could be applied to the detection of the coating thickness of color coated plates.