用于测量涂层厚度的调制阶跃加热热成像技术

IF 4.1 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2024-05-14 DOI:10.1016/j.ndteint.2024.103140

Fei Chen , Kai Zhang , Haijun Jiang , Zhonghua Shen , Li Chen

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引用次数: 0

摘要

本文提出了用于不透明涂层厚度测量的调制阶跃加热热成像技术。通过调制加热通量以一定频率加热表面，热波被限制在涂层内。热信号的直流分量按交流分量的振幅归一化，以消除加热强度、表面吸收率和发射率变化的影响，从而与涂层厚度呈线性相关。同时，它消除了传统热成像技术中繁琐的频率跟踪和非单调性问题。理论和实验结果都证实了这一方法的有效性。在测量厚度为 100 至 400 μm 的试样时，相对误差在 ±7.9 % 以内。

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Modulated step-heating thermography for coating thickness measurement

In this paper, the modulated step-heating thermography is proposed for opaque coating thickness measurement. The surface is heated by a modulated heating flux at a frequency that the thermal wave is confined within the coating layer. The DC component of the thermal signal is normalized by the amplitude of the AC component to cancel out the influences from the variations in heating intensity, surface absorptivity and emissivity, resulting in a linear correlation to the coating thickness. Meanwhile, it eliminates the need for tedious frequency trail and the issue of the nonmonotonicity as suffered in conventional thermography. Both theoretical and experimental results confirmed the effectiveness. Specimens with thickness ranging from 100 to 400 μm are measured with a relative error within ±7.9 %.

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来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

期刊介绍： NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.