Damage detection in cable braidings using integrated fiber-optic reflectors

Moritz A. Graf; Christoph Eisermann; Fabian Ehmer; Michael H. Köhler; Martin Jakobi; Alexander W. Koch

doi:10.1117/12.2319283

4 September 2018 Damage detection in cable braidings using integrated fiber-optic reflectors

Moritz A. Graf, Christoph Eisermann, Fabian Ehmer, Michael H. Köhler, Martin Jakobi, Alexander W. Koch

Author Affiliations +

Proceedings Volume 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII; 107550E (2018) https://doi.org/10.1117/12.2319283
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

In cable industry, structural health monitoring is becoming more and more important. Of special relevance is the damage detection in cables which supply large excavation equipment like bucket wheel excavators in opencast mining. Here, damage localization is often still carried out manually. With a usual cable length of a few kilometers, this method is inefficient and can lead to unnecessary revenue losses caused by long repair and machine downtime. Because of their electromagnetic immunity, their functionality over long transmission distances, their resistance to difficult environmental conditions, and their comparatively easy integrability, fiberoptic sensors are particularly suitable for detecting damages in this application. Therefore, in this paper, a novel spatially resolving and inexpensive damage detection system based on fiberoptic reflectors is presented. With a physical vapor deposition method, an increased reflectance of the coated single mode fiber ends was achieved. Due to the special integration position of the sensors in the braiding structure of a cable, damage in the jacket area can be detected. Via measurements of the reflected signal intensities, the position of the damage can be resolved over long distances. Furthermore, the sensor arrangement engages only slightly in the manufacturing process of the cable braiding and the cable. The ability of the presented measurement system to perform damage detection independent of the regular power transmission of the cable offers an advantage over standard cable conductor based electrical damage detection techniques.

Citation Download Citation

Moritz A. Graf, Christoph Eisermann, Fabian Ehmer, Michael H. Köhler, Martin Jakobi, and Alexander W. Koch "Damage detection in cable braidings using integrated fiber-optic reflectors", Proc. SPIE 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII, 107550E (4 September 2018); https://doi.org/10.1117/12.2319283

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KEYWORDS

Reflectors

Fiber optics

Damage detection

Mining

Reflectivity

Optical fibers

Power supplies

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