[3B2] Building trust in NDT: the role of metrology in industrial electromagnetic techniques
G Finch
National Physical Laboratory, UK
The Electronic and Magnetic Materials Group at the National Physical Laboratory (NPL) plays a critical role in advancing metrology to support electromagnetic non-destructive testing (NDT) techniques. Accurate and traceable measurement is essential for ensuring the reliability and repeatability of methods such as eddy current testing (ECT), which is widely used in the detection of surface and near-surface defects, as well as for monitoring corrosion under insulation (CUI). This work focuses on the development and refinement of primary standards, calibration artefacts and measurement methodologies that underpin electromagnetic NDT. Through a combination of advanced material characterisation, sensor calibration and electromagnetic modelling, the group aims to reduce measurement uncertainty and enhance detection capabilities in industrial environments. Case studies are presented demonstrating how improved metrological infrastructure supports the performance evaluation of ECT systems and aids in the interpretation of complex signals arising from CUI. As industries demand ever higher levels of integrity assurance, particularly in safety-critical sectors such as energy, transport and infrastructure, the importance of rigorous, standards-based metrology in NDT continues to grow. This presentation outlines current progress and future directions for metrology to support robust, reliable electromagnetic NDT.
