National Physical Laboratory

Advanced electromagnetic NDT seminar hosted by NPL

Advanced electromagnetic NDT seminar hosted by NPL

On Wednesday 16 September 2015, NPL's Magnetic Materials and Sensors Group hosted a one-day seminar on 'Advanced Electromagnetic Measurements for Non-Destructive Determination of Material Properties', giving researchers, manufacturers and end users the opportunity to discuss the latest developments in electromagnetic NDT. The aim of the meeting was to recognise industries' requirements and to promote the work that NPL and other research teams have contributed to the development of electromagnet NDT.

The programme comprised seven presentations, separated by a midday lab tour prepared by the Magnetic Materials and Sensors Group, drawing a crowd of over 60 registrants from universities, instrument manufacturers and the steel industry. All were keen to discover technologies that could evaluate material properties within harsh environments, or models that further our understanding of the relationship between metallurgy and magnetic properties, or metrology needed to bridge the gap between qualitative and quantitative NDT.

Dr Michael Hall, from NPL's Magnetic Material and Sensors Group, giving an overview of NPL's capability

The morning session focused on the adaptation of non-destructive tools for their respective applications and the advancements in modelling and metrology needed to better understand the coupling between the electromagnetic responses of materials as individual mechanical properties are changed. A case study was presented by Peter Hunt from Primetals Technologies, who have recently outfitted and deployed an EMSpec® system onto a hot strip mill to monitor the phase transformation from Austenite to Ferrite during cooling. The session ended with Dr Michael Hall (pictured below) from the Magnetic Material and Sensors Group, giving an overview of NPL's capability, followed by case studies of magnetic properties being measured under real-world operating conditions.

Following lunch and a poster session in NPL's Reception, groups were given a guided tour of the laboratories, where Stuart Harmon discussed the intricacies of AC conductivity standards, which are materials characterised by NPL and sold to industry where they are used to calibrate eddy-current conductivity meters. Nicholas Hillier also presented his research on the development of an open-circuit measurement system for characterising magnetic materials with component geometries and at elevated temperatures up to 200 °C, a significant improvement on the functionality of present-day standard techniques.

In the afternoon session, the development of sensor technologies such as giant magnetoimpedance and tangential magnetic field devices, were discussed. Dr Amitava Mitra from India's National Metallurgical Laboratory detailed his investigations into the refinement of amorphous ribbon by water quenching. The additions of Niobium and Chromium were also investigated, which increased the giant magnetoimpendance by 85 % and 135 % respectively. The final talk of the afternoon was presented by Dr Andrea Kontogeorgos, a portfolio manager at EPSRC, who began by giving an overview of the 115 research areas where EPSRC are actively investing and also discussed the role of the RCNDE in funding NDT research.

For further information, please contact Stuart Harmon or Nicholas Hillier

Last Updated: 21 Feb 2017
Created: 28 Sep 2015

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