B3.2 - Long-term reliability of fiber-optic current sensors in damp heat

Event
AMA Conferences 2017
2017-05-30 - 2017-06-01
Nürnberg, Germany
Band
Proceedings Sensor 2017
Chapter
B3 - Fiber-Optical Sensors
Author(s)
M. Lenner, L. Yang, A. Frank, K. Bohnert - ABB Schwitzerland Ltd., Baden-Dättwil (Switzerland)
Pages
202 - 205
DOI
10.5162/sensor2017/B3.2
ISBN
978-3-9816876-4-4
Price
free

Abstract

The measurement of electric current in industrial applications is associated with stringent requirements for accuracy, reliability and availability. We set up an extensive reliability test program in order to validate the reliability of components used in fiber-optic current sensors (FOCS). For many components operated in harsh environments, damp heat is often the most crucial environmental stressor. Potential failure modes include shifts in the source wavelength, changes in birefringence of certain optical components due to stress and excessive insertion loss. Degradation can lead to sensor scale factor change, or in
extreme cases, to sensor failure. Our experiments have demonstrated that appropriately designed, packaged and burned-in components survive extended exposure to damp heat without significant performance loss.

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