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Evaluation of continuous fiber Bragg grating and signal processing method for hotspot detection at cryogenic temperatures

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posted on 2022-03-23, 03:12 authored by Maximilian Fisser, Xiyong HuangXiyong Huang, Dominic A Moseley, Chris W Bumby, Rodney BadcockRodney Badcock
Abstract The recent adoption of High-Tc superconductor (HTS) wires for ultra-high field magnet windings provide great promise for future applications, such as high-power generators and Tokamak fusion reactors. However, an open issue with the use of HTS is the challenge of rapidly detecting a hot spot which could lead to a quench. Optical fiber sensors have been shown to be promising alternatives to the voltage-based quench detection method. In this paper, we report on ultra-long fiber Bragg gratings (ULFBG) for hotspot detection at cryogenic temperatures using a new detection algorithm. This novel sensing system is suitable for applications in which solely the occurrence of a hotspot but not its precise location is of importance. This is the case e.g. for quench detection in HTS. The developed system provides the advantages of cost reduction and faster response time compared to conventional FBGs with wavelength-division multiplexing (WDM) and continuous FBGs with time-division multiplexing (TDM), respectively. We demonstrate the functionality of the system for the ULFBG with a grating length of 100 mm and 500 mm at 77 and 90K respectively. The ULFBG is shown to respond as fast as conventional FBG, to a hot spot as small as 1 K temperature rise. Furthermore, using the proposed signal processing algorithm, ULFBG exhibits much higher signal to noise ratio than that from the conventional FBG. It is believed that artificial intelligence (AI) based technique can assist the signal processing algorithm in detecting a small hot spot more rapidly from the big spectral data in real-time.

History

Preferred citation

Fisser, M., Huang, X., Moseley, D. A., Bumby, C. W. & Badcock, R. A. (2022). Evaluation of continuous fiber Bragg grating and signal processing method for hotspot detection at cryogenic temperatures. Superconductor Science and Technology. https://doi.org/10.1088/1361-6668/ac5d68

Journal title

Superconductor Science and Technology

Publication date

2022-03-14

Publisher

IOP Publishing

Publication status

Published online

Online publication date

2022-03-14

ISSN

0953-2048

eISSN

1361-6668