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.

红外（IR）光谱的各个波段对于通过视觉技术检测材料是有意义的。我们的提案重点关注1热波段、2太赫兹成像（远红外）的红外热成像。 背景：1 - //红外热成像//可应用于材料和结构的无损评价（NDE）：它被称为红外热成像NDE（TNDE）。主动热成像是当被检查的组件被加热（或冷却），如我们的建议。 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，TNDE都存在许多问题。 用于材料检测的2 - //太赫兹（THz）成像// THz具有很高的NDE潜力，例如评估航空复合材料部件中各种表面下缺陷的存在，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THz区域具有独特的“光谱指纹”。然而，THzNDE是新的，需要做很多工作来增强和解释信号。 目的：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测方案：«室内无人机红外热成像检测»。其原理是通过无人机在大面积上进行检查。室内飞行放宽了飞行限制，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。这样的计划是新的TNDE的挑战，在飞行控制，定位的对象，红外图像拼接，对流效应，由于螺旋桨，丢失的部分热时间序列等2-THz NDE：目标是深入研究THz图像，需要进一步的处理步骤，以获得深入了解所观察到的标本的内部结构。结合建模和实验，提出了一种时频分析方法。最后提出了TNDE和THzNDE数据融合，因为这两种模式分析的材料遵循不同的方案。 结论：研究计划提出了新的关键方向，在该领域的无损检测红外成像。这里介绍的工作是有前途的，它带来了新的想法，IR-NDE社区和工业用户，同时解决关键问题。几个HQP将参与拟议研究活动的所有阶段。拟议活动的意义可以从两个方面看出来。工作的基础有很强的理论基础，拟议方案的结果得到了很好的应用，例如在加拿大的工业中，在以前的研究活动中已经建立了联系，以确保有价值的附带利益。 注：感谢RTI NSERC和CFI赠款我们的实验室。配备了TNDE，THz成像系统和室内无人机。