CAPACITIVE IMAGING FOR NDE

提出研究一种被称为电容成像的濒死体验技术。这种方法是一种非接触式技术，应该能够检查各种材料类型，从绝缘体（包括聚合物和复合材料）到金属。它可以在水下和恶劣环境（高温/低温，放射性环境等）中使用，并且可以在物体上扫描。因此，它应该广泛应用于濒死体验。该技术使用一组电极，放置在靠近材料表面的地方。电场分布与材料的相互作用导致样品本身的电学性质发生变化时信号发生变化，从而使成像成为可能。由RCNDE从核心资金中资助的可行性研究表明，在广泛的材料上取得了有希望的结果。目前有针对性的建议旨在进一步研究该技术的基本特性，涉及实验和有限元建模的结合。还计划将仪器扩展到可切换阵列，以进行快速大面积检查。该技术将应用于与工业有关的问题，包括检查航空航天结构和检测绝缘体下的腐蚀。

It is proposed to investigate a technique for NDE known as capacitive imaging. This approach is a non-contact technique, and should be capable of inspecting a wide range of material types, from insulators (including polymers and composites) to metals. It can be used both underwater and in hostile environments (high/low temperatures, radioactive environments etc), and can be scanned over objects. It should thus have wide application to NDE. The technique uses a set of electrodes, placed close to the surface of the material. Interaction of the electric field distribuion with the material leads to changes in signal when the electrical properties of the sample themselves change, leading to the possibility of imaging. A feasibility study, funded by the RCNDE from core funds, demonstrated promising results on a wide range of materials. The present targetted proposal aims to investigate the fundamental properties of this technique further, involving a combination of experiment and FE modelling. It is also planned to extend the instrumentation to switchable arrays for rapid large-area inspection. The technique will be applied to problems of industrial relevance, including the inspection of aerospace structures, and the detection of corrosion under insulators (CUI).