On the development of an improved magnetic-based corrosion sensor

Oleg Shiryayev; Matthew Cullin; Raghu Srinivasan

doi:10.1117/12.2583312

22 March 2021 On the development of an improved magnetic-based corrosion sensor

Oleg Shiryayev, Matthew Cullin, Raghu Srinivasan

Proceedings Volume 11591, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2021; 115911M (2021) https://doi.org/10.1117/12.2583312
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

Previously, a sensor was proposed for detection of internal corrosion in pipelines made of ferromagnetic materials. The original sensor prototype was composed of a beam made of non-magnetic material, a strong permanent magnet, and the Fiber Bragg Grating strain sensor. The operating principle of the sensor is based on the fact that the magnetic attraction force between the magnet and the pipe wall decreases as the thickness of the pipe wall decreases due to internal corrosion. The FBG sensor is attached to the beam and allows to monitor the strain generated by the magnetostatic force acting on the magnet. Hence, the change in the force can be related to the change in the thickness of the pipe wall and detected using an optical strain gauge. In this work we present results of numerical investigations for two different alternative sensor configurations that are aimed at improving the detection range of the sensor. In the first configuration, the magnet is encased in an enclosure made of ferromagnetic material. In the second configuration we consider a more complex magnetic circuit that includes a magnetic counterbalance placed on the opposite side of the first magnet. We compare the absolute and relative changes in the magnetostatic force in both configurations to the baseline case of the original prototype and formulate suggestions for the improved design.

Conference Presentation

Citation Download Citation

Oleg Shiryayev, Matthew Cullin, and Raghu Srinivasan "On the development of an improved magnetic-based corrosion sensor", Proc. SPIE 11591, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2021, 115911M (22 March 2021); https://doi.org/10.1117/12.2583312

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