Mr. Leonard E. Martinez Profile

Leonard E. Martinez

at Sandia National Labs

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Proceedings Article | 3 September 2008 Paper

Lightning vulnerability of fiber-optic cables

L. Martinez, M. Caldwell

Proceedings Volume 7070, 70700C (2008) https://doi.org/10.1117/12.795347

KEYWORDS: Optical fiber cables, Fiber optics, Electrodes, Fiber optics tests, Laser sintering, Scanning electron microscopy, Resistance, Chemical elements, Optical fibers, Dielectrics

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One reason to use optical fibers to transmit data is for isolation from unintended electrical energy. Using fiber optics in an application where the fiber cable/system penetrates the aperture of a grounded enclosure serves two purposes: first, it allows for control signals to be transmitted where they are required, and second, the insulating properties of the fiber system help to electrically isolate the fiber terminations on the inside of the grounded enclosure. A fundamental question is whether fiber optic cables can allow electrical energy to pass through a grounded enclosure, with a lightning strike representing an extreme but very important case. A DC test bed capable of producing voltages up to 200 kV was used to characterize electrical properties of a variety of fiber optic cable samples. Leakage current in the samples were measured with a micro-Ammeter. In addition to the leakage current measurements, samples were also tested to DC voltage breakdown. After the fiber optic cables samples were tested with DC methods, they were tested under representative lightning conditions at the Sandia Lightning Simulator (SLS). Simulated lightning currents of 30 kA and 200 kA were selected for this test series. This paper documents measurement methods and test results for DC high voltage and simulated lightning tests performed at the Sandia Lightning Simulator on fiber optic cables. The tests performed at the SLS evaluated whether electrical energy can be conducted inside or along the surface of a fiber optic cable into a grounded enclosure under representative lightning conditions.

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