Title :
Fiber Bragg Grating Sensor for Strain Sensing in Low Temperature Superconducting Magnet
Author :
Zhang, Hongjie ; Wang, Qiuliang ; Wang, Housheng ; Song, Shousen ; Zhao, Baozhi ; Dai, Yinming ; Huang, Guojun ; Jiang, Zhonghua
Author_Institution :
Key Lab. of Appl. Supercond., Chinese Acad. of Sci., Beijing, China
fDate :
6/1/2010 12:00:00 AM
Abstract :
Fiber Bragg grating (FBG) sensor for monitoring the electromagnetic strain in a low temperature superconducting (LTS) magnet was studied. Before used to LTS magnet strain sensing, the strain response of the sensor with 1.54- wavelength at liquid helium was experimentally studied. It was found that the wavelength shift showed good linearity with longitudinal applied loads and the strain sensitivity is constant at 4.2 K. And then, the hoop strain measurement of a LTS magnet was carried out on the basis of measured results. Furthermore, the finite element method (FEM) was used to simulate the magnet strain. The difference between the experimental and numerical analysis results is very small.
Keywords :
Bragg gratings; fibre optic sensors; finite element analysis; strain measurement; strain sensors; superconducting magnets; electromagnetic strain; fiber Bragg grating sensor; finite element method; hoop strain measurement; liquid helium; low temperature superconducting magnet; strain sensing; temperature 4.2 K; wavelength 1.54 mum; wavelength shift; Fiber Bragg grating; LTS magnet; liquid helium temperature; strain sensing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2010.2042693
