Magnetic Imaging of Corrosion under Insulation using Quantum Well Hall Effect Sensors

Alexander Lindley, James Sexton, Ruslan Murshudov, Mohamed Missous

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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Abstract

Corrosion Under Insulation (CUI) is one of the most pressing issues facing industries that make use of cladded steel pipes, costing companies trillions of dollars every year to maintain them. Currently while there are few devices capable of detecting corrosion under insulation, they remain expensive, bulky, and difficult to utilise over kilometres of cladded steel pipe [1]. This research presents a prototype device using novel Quantum Well Hall Effect (QWHE) sensors. These sensors are physically small (70-micron square), made on Gallium Arsenide substrates, capable of measuring magnetic fields in the tens of nanotesla, and have a linear response ideally suited to imaging applications [2], [3]. This prototype is capable of scanning insulated or cladded steel pipes. It can detect manufactured wall thickness loss of 1mm, 2mm, and 3mm, in a 10mm thick pipe, which represent 10%, 20%, and 30% loss respectively as far as 95mm from the surface with micron level resolution. The research presented here focuses on demonstrating the accuracy of the QWHE sensor-based prototype system by comparing the measured magnetic data to a scan of the same machined pipe acquired with a high precision laser. Together these two different scans demonstrate the possibility of using a QWHE sensor in future designs aimed at tackling the pressing issue of CUI.

Original languageEnglish
Title of host publicationProceedings of the Annual British Conference on Non-Destructive Testing
Subtitle of host publication60th Annual Conference of the British Institute of Non-Destructive Testing, NDT 2023
PublisherBritish Institute of Non-Destructive Testing
Pages1-8
Volume23
Edition1
ISBN (Electronic)9781713874836
DOIs
Publication statusPublished - 15 Dec 2023
Event60th Annual Conference of the British Institute of Non-Destructive Testing, NDT 2023 - Northampton, United Kingdom
Duration: 12 Sept 202314 Sept 2023

Conference

Conference60th Annual Conference of the British Institute of Non-Destructive Testing, NDT 2023
Country/TerritoryUnited Kingdom
CityNorthampton
Period12/09/2314/09/23

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