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: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=754134
• 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）中的各种红外 (IR) 光谱波段：1 - // 红外热成像。 // 可应用于材料和结构的无损评估 (NDE)：被称为红外热成像 NDE (TNDE) 是在受检部件被加热（或）时进行的。尽管 TNDE 越来越受欢迎，但它在刺激阶段或解释阶段都面临着许多问题 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特征“光谱指纹”。然而，太赫兹无损检测是一项新的技术，需要做很多工作。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»。其原理是通过无人机在大面积的表面上进行检查，从而放宽了飞行限制，例如飞行员执照、交通部授权和规则、飞行时间+收集数据（由于有上限）。脐带）、恶劣天气（下雨等）的存在，这种方案对于 TNDE 来说是新的，在飞行控制、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方面存在挑战。 2- THzNDE：目标是深入研究需要进一步处理步骤的太赫兹图像，以便深入了解所观察样本的内部结构，提出了结合建模和分析的时频方法。最后提出了 TNDE 和 THzNDE 数据融合，因为两种模式都按照不同的方案分析材料。 结论：该研究计划提出了红外成像 NDE 领域的新关键方向，它为人们带来了新的想法。 IR-NDE 社区和工业用户在解决关键问题时将参与拟议研究活动的各个阶段。这项工作的基础有以下几个方面。拟议项目的强大理论基础和结果得到了很好的应用，例如在之前的研究活动中已经建立了联系的加拿大行业，以确保有价值的衍生品。注：感谢 RTI NSERC 和 CFI 的资助，我们的实验室。配备 TNDE、太赫兹成像系统和室内无人机。