Abstract
This contribution presents distributed and multipoint fiber-optic monitoring of cryogenic temperatures along a superconducting power transmission line down to 30 K and over 20 m distance. Multipoint measurements were conducted using fiber Bragg gratings sensors coated with two different functional overlays (epoxy and poly methyl methacrylate (PMMA)) demonstrating cryogenic operation in the range 300–4.2 K. Distributed measurements exploited optical frequency-domain reflectometry to analyze the Rayleigh scattering along two concatenated fibers with different coatings (acrylate and polyimide). The integrated system has been placed along the 20 m long cryostat of a superconducting power transmission line, which is currently being tested at the European Organization for Nuclear Research (CERN). Cool-down events from 300–30 K have been successfully measured in space and time, confirming the viability of these approaches to the monitoring of cryogenic temperatures along a superconducting transmission line.
© 2015 Optical Society of America
Full Article | PDF ArticleMore Like This
Zhipeng Tian, Zhihao Yu, Bo Liu, and Anbo Wang
Opt. Lett. 41(2) 195-198 (2016)
An Li, Yifei Wang, Jian Fang, Ming-Jun Li, Byoung Yoon Kim, and William Shieh
Opt. Lett. 40(7) 1488-1491 (2015)
Wei Zhang, David J. Webb, and Gang-Ding Peng
Opt. Lett. 40(17) 4046-4049 (2015)