Innovative Developments of Infrared Vision for Non Destructive Evaluation

红外光谱的各个波段是通过视觉技术检测材料的兴趣。我们的建议集中在红外热成像在1热波段，2太赫兹成像（远红外）。背景：1 - //红外热成像//可以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部件被加热（或冷却）时，如我们的建议。尽管TNDE越来越受欢迎，但在增产阶段和解释阶段都存在许多问题。2 - //太赫兹（THz）成像用于材料检测//太赫兹在无损检测中具有很高的潜力，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，THzNDE是一种新技术，需要做很多工作来增强和解释信号。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”。原理是让无人机在一个大的表面上进行检查。室内飞行放宽了飞行限制，如飞行员执照、交通部授权和规则、飞行时间+收集数据（多亏了天花板脐带）、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、目标定位、红外图像拼接、螺旋桨对流效应、热时间序列缺失部分等方面都面临挑战。2- THzNDE：目标是深入研究需要进一步处理步骤的太赫兹图像，以便深入了解观察样本的内部结构。结合建模和实验，提出了一种时频方法。最后提出了一种TNDE和THzNDE数据融合的方法，因为这两种模式采用不同的方案来分析材料。结论：本研究项目为红外成像无损检测领域提出了新的重点方向。这里展示的工作很有希望，它在解决关键问题的同时为IR-NDE社区和工业用户带来了新的想法。几个HQPs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。这项工作的基础具有很强的理论基础，所提议的项目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，以确保有价值的衍生。注：感谢RTI NSERC和CFI资助，我们的实验室。配备TNDE、太赫兹成像系统和一架室内无人机。

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.