Damage Detection and Localization in Metallic Structures Based on Jointed Electromagnetic Waveguides: A Proof-of-Principle Study

Abstract

This paper presents a novel approach for the detection of surface damage in metallic structures, where the electromagnetic waveguide forms a union with the structure to be inspected. The sensing concept in such jointed electromagnetic waveguides will be described here and measurement results will be presented using a hollow metallic waveguide on an aluminium sample. The experimental proof of principle is performed in the frequency band from 20 to 40 GHz using a network analyzer. It is possible to (i) detect holes as small as 1 mm, (ii) discriminate between different hole sizes, and, (iii) localize the axial position of the defect in the waveguide. This approach has great potential to be used for structural health monitoring of complex technical structures and components.

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Acknowledgements

The author gratefully acknowledges the partial financial support of this research by the Federal Ministry for Economic Affairs and Energy (Grant Number: 03SX422B). The author thanks Duy Hai Nguyen (Frankfurt University of Applied Sciences) for his support during the measurements.

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Correspondence to Jochen Moll.

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Moll, J. Damage Detection and Localization in Metallic Structures Based on Jointed Electromagnetic Waveguides: A Proof-of-Principle Study. J Nondestruct Eval 37, 69 (2018). https://doi.org/10.1007/s10921-018-0524-y

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Keywords

  • Jointed electromagnetic waveguides
  • Damage detection
  • Structural health monitoring
  • Ulta-wideband measurements