Thickness evaluation of organic coating using active long-pulse transmission thermography

IF 3.1 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2024-08-22 DOI:10.1016/j.infrared.2024.105516

Lijun Zhuo , Changhu Liu , Jun Zhou , Jianguo Zhu , Chaoyi Li , Antonio Fernández López

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引用次数: 0

Abstract

The thickness of the optically translucent coating was evaluated using the transmission thermography. The transmitted temperature of a two-layer structure was theoretically analysed based on the equation of 1D heat transfer in the depth direction, and accordingly, the method for the measurement of coating thickness in a two-layer structure was established based on a long-pulse transmission thermography. The coating thickness was determined based on the characteristic time at the maximum half-rise temperature. Then, the proposed method was experimentally validated and calibrated by coating specimen with a different coating thickness. The thickness measurement method was further applied to measure an uneven coating specimen fabricated by mechanical grinding. The measurements were compared with a 3D digital image correlation method and the averaged relative error was less than 4%. Finally, thermal excitation, sampling rate of thermography and translucence of organic coating were discussed for accurate measurement.

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利用主动长脉冲透射热成像技术评估有机涂层的厚度

利用透射热成像技术评估了光学半透明涂层的厚度。根据深度方向的一维传热方程对双层结构的透射温度进行了理论分析，并据此建立了基于长脉冲透射热成像技术的双层结构涂层厚度测量方法。涂层厚度是根据最大半升温度下的特征时间确定的。然后，利用不同涂层厚度的涂层试样对所提出的方法进行了实验验证和校准。厚度测量方法还进一步应用于测量通过机械研磨制作的不均匀涂层试样。测量结果与三维数字图像相关方法进行了比较，平均相对误差小于 4%。最后，讨论了精确测量所需的热激发、热成像采样率和有机涂层的半透明度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.