| 环境因素对闪光灯激励红外热成像外场检测的影响 |
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| 引用本文： | 刘颖韬,许路路,何方成,李硕宁,杨党纲.环境因素对闪光灯激励红外热成像外场检测的影响[J].红外与激光工程,2021,50(12):20210711-1-20210711-8. |
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| 作者姓名： | 刘颖韬 许路路 何方成 李硕宁 杨党纲 |
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| 作者单位： | 1.中国航发北京航空材料研究院，北京 100095 |
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| 基金项目： | 国家自然科学基金（U1433122，61571028）；国防基础科研计划（JSZL2019205C003） |
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| 摘 要： | 为了研究外场环境下实施红外热成像检测时，环境温度、日照、风速等外场环境因素对检测的影响机理及规律，文中以闪光灯激励红外热像法检测玻璃纤维增强塑料层压板分层缺陷为例，通过轴对称分层缺陷的物理建模、有限元仿真计算和基于试块的实验研究，得到了温差、温差最大值、温度对比度和温度对比度最大值等可检信息参数随各个环境因素变化的规律。文中对比了25 ℃和30 ℃环境温度下的仿真结果和实验结果，对比了日照不均和均匀温度下的仿真结果和实验结果，对比了对流换热系数为10 W/(m2·K)与100 W/(m2·K)的仿真结果和正常散热与强制散热的实验结果。基于以上仿真结果和实验结果，得出了如下结论:随着环境温度的升高，温度对比度最大值下降，缺陷清晰度下降，不利于缺陷的检出；日照不均使得温差最大值和温度对比度最大值或者增大或者减小，会造成误判或缺陷漏检；随着风速的增大，温差最大值和温度对比度最大值变小，缺陷的可检性变差，缺陷的清晰程度下降，不利于缺陷检测。
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| 关 键 词： | 红外热像无损检测 外场检测 在役检测 红外热波 无损检测 |
| 收稿时间： | 2021-09-27 |
Effects of environmental factors on infrared flash thermography nondestructive testing in outfield detection |
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| Affiliation: | 1.AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China2.Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation, Beijing 100095, China3.Key Laboratory of Aeronautical Materials Testing and Evaluation, Aero Engine Corporation of China, Beijing 100095, China4.Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation, Beijing 100095, China5.School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | To reveal mechanism of influence of environmental factors such as ambient temperature, sunshine and wind velocity on infrared thermographic nondestructive testing, modeling of a delamination in a glass fiber reinforced plastic specimen in infrared flash thermography testing was made and studied. The model was an axial symmetry model. Thermal signals to be detected in infrared thermographic nondestructive testing, such as temperature difference, the maximum temperature difference, temperature contrast and the maximum temperature contrast, were calculated and analyzed using finite element method in that model. Several experiments with special process treatment on that specimen were carried out. Evolution of the thermal signals with changes of those environmental factors was researched. Comparison of results from modeling and experiment in ambient temperature 25 ℃ and 30 ℃ was made. Results from modeling and experiments in uneven sunshine and in homogeneous temperature were compared too. Results in deferent wind speed were presented at the end of this paper. Convective heat transfer coefficients in the model were 10 W/(m2·K) and 100 W/(m2·K). The simulation results and the experiment results show that the maximum temperature contrast declines with increase of ambient temperature. Decline of the maximum temperature contrast means that clarity of defect gets worse, and detection of defect becomes more difficult. The maximum temperature difference and the maximum temperature contrast increase or decrease due to uneven sunshine on the specimen. Those changes lead to misjudgment or missing detection. Increase of wind velocity may reduce the maximum temperature difference and the maximum temperature contrast, and result in worse detectability and clarity of defect. |
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