Innovative Developments of Infrared Vision for Non Destructive Evaluation

无损评估红外视觉的创新发展

• 批准号: RGPIN-2019-05255
• 负责人: Maldague, Xavier
• 金额: $ 3.35万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=715435
• 关键词: Innovative; Developments; Infrared; Vision; Non

Various bands of the infrared (IR) spectrum are of interest for the inspection of materials through vision techniques. Our proposal focuses on IR thermography in 1 - thermal bands, 2 - terahertz imaging (far IR). CONTEXT: 1 - // Infrared Thermography // can be applied to the Non Destructive Evaluation (NDE) of materials and structures: it is called IR Thermography NDE (TNDE). Active thermography is when the inspected component is heated (or cooled) as in our proposal. Despite being increasingly popular, TNDE presents challenges with many problems either at the stimulation stage or interpretation stage. 2 - // Terahertz (THz) imaging for material inspection // THz has an high potential for NDE such as to assess presence of various subsurface defects in aeronautical composite components, critical humidity levels in various materials, etc. Material analysis is also possible because different materials have unique characteristics «spectral fingerprints» in the THz region. However THzNDE being new, much work is needed to enhance and interpret signals. OBJECTIVES: Objectives of the proposed research program are oriented towards solution of these problems 1- TNDE: Objectives are to study in depth, through thermal modeling and experiments, a new scheme of inspection: «indoor-drone IR thermography inspection». The principle is to have the inspection proceeds over a large surface by a drone. Indoor flying relaxes flight constraints such pilot license, DOT authorizations and rules, flight duration + collecting data (thank to a ceiling umbilical), presence of inclement weather (rain, etc). Such a scheme is new for TNDE with challenges in terms of flight control, positioning over the object, IR image stitching, convective effects due to propellers, missing portions of thermal time sequences, etc. 2- THzNDE: Objectives are to study in depth THz images which need further processing steps in order get a deep insight of the inner structure of the observed specimens. A time-frequency approach is proposed in conjunction with modeling and experiments. Finally a TNDE and THzNDE data fusion is proposed since both modalities analyze the materials following different schemes. CONCLUSIONS: The research program proposes new key directions in the field of NDE by IR imaging. Work presented here is promising, it brings fresh ideas to the IR-NDE community and industrial users while solving critical problems. Several HQPs will be involved at all stages of the proposed research activities. Significance of the proposed activities can be seen on two sides. The basis of the work has a strong theoretical foundation and results of the proposed program are well applied, for instance in Canadian industries where contacts have already been established during previous research activities, to ensure valuable spins-off. NOTE: Thank to RTI NSERC and CFI grants, our lab. is equipped with TNDE, THz imaging systems and a indoor drone.

我们的建议重点关注 1 - 热波段、2 - 太赫兹成像（远红外）中的红外热成像技术。 语境： 1 - // 红外热成像 // 可应用于材料和结构的无损评估 (NDE)：它被称为红外热成像 NDE (TNDE)，即当被检查的部件被加热（或冷却）时。提议。 尽管TNDE越来越受欢迎，但无论是在刺激阶段还是在解释阶段都面临着许多问题的挑战。 2 - // 用于材料检测的太赫兹 (THz) 成像 // THz 在 NDE 方面具有很高的潜力，例如评估航空复合材料部件中各种地下缺陷的存在、各种材料中的临界湿度水平等。材料分析也是可能的，因为不同的材料在太赫兹区域具有独特的“光谱指纹”特性，但是太赫兹无损检测是一种新的技术，需要做很多工作来增强和解释信号。 目标： 拟议研究计划的目标是解决这些问题 1- TNDE：目标是通过热建模和实验深入研究一种新的检查方案：“室内无人机红外热成像检查”，其原理是通过室内飞行进行大面积的检查。放宽飞行限制，例如飞行员执照、DOT 授权和规则、飞行时间 + 收集数据（感谢天花板脐带）、恶劣天气（下雨等）的存在。这样的计划对于 TNDE 来说是新的，但在方面存在挑战。飞行控制、物体定位、红外图像拼接、螺旋桨造成的对流效应、热时间序列的缺失部分等。 2- THzNDE：目标是深入研究需要进一步处理步骤的太赫兹图像，以便深入了解观察到的样本的内部结构，最后提出了结合建模和实验的时频方法。由于两种模式都按照不同的方案分析材料，因此提出了 THzNDE 数据融合。 结论： 该研究计划提出了红外成像无损检测领域的新关键方向，它为红外无损检测社区和工业用户带来了新的想法，同时解决了各个阶段的关键问题。拟议的研究活动的意义可以从两个方面看出：这项工作的基础具有坚实的理论基础，并且拟议项目的结果得到了很好的应用，例如在之前的研究中已经建立了联系的加拿大行业。活动，确保有价值分拆。 注：感谢 RTI NSERC 和 CFI 的资助，我们的实验室配备了 TNDE、太赫兹成像系统和室内无人机。