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.

红外(IR)光谱的不同波段对于通过视觉技术检查材料是有意义的。我们的建议侧重于1-热波段的红外热成像，2-太赫兹成像(Far IR)。 上下文： 1-//红外热成像//可用于材料和结构的无损检测：称为红外热成像无损检测(TNDE)。主动热像仪是指按照我们的建议对被检查部件进行加热(或冷却)。 尽管TNDE越来越受欢迎，但无论是在刺激阶段还是在口译阶段，TNDE都面临着许多问题。 2-//太赫兹(THz)成像用于材料检验//太赫兹具有很高的无损检测潜力，例如评估航空复合材料部件中各种亚表面缺陷的存在，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有独特的特征“光谱指纹”。然而，THzNDE是一种新事物，需要做大量的工作来增强和解释信号。 目标： 拟议研究方案的目标是解决这些问题 1-TNDE：目标是通过热模拟和实验深入研究一种新的检查方案：“室内-无人机红外热像检查”。其原理是让无人机在一个大表面上进行检查。室内飞行放宽了飞行限制，如飞行员执照、DOT授权和规则、飞行持续时间+收集数据(感谢脐带上限)、恶劣天气(下雨等)。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、热时间序列缺失等方面都存在挑战。 2-THzNDE：目标是深入研究需要进一步处理的太赫兹图像，以便深入了解观察到的样品的内部结构。提出了一种结合建模和实验的时频分析方法。最后，由于TNDE和THzNDE对材料的分析遵循不同的方案，因此提出了一种TNDE和THzNDE的数据融合方法。 结论： 该研究计划提出了红外成像无损检测领域的新的重点方向。这里提出的工作是有前景的，它为IR-NDE社区和工业用户带来了新的想法，同时解决了关键问题。在拟议研究活动的所有阶段都将有几个总部基地参与。拟议活动的意义可以从两个方面看出。这项工作的基础有很强的理论基础，拟议计划的结果得到了很好的应用，例如在加拿大的行业中，这些行业在之前的研究活动中已经建立了联系，以确保有价值的衍生产品。 注：感谢RTI NSERC和CFI拨款，我们的实验室。配备了TNDE、THz成像系统和一架室内无人机。