Fiber Bragg Gratings for Strain Sensing in High Temperature Superconducting Magnet

Author

Wang, Q. ; Fen, Z. ; Deng, F. ; Huang, G. ; Yan, L. ; Dai, Y.

Author_Institution

Chinese Acad. of Sci., Beijing

Volume

17

Issue

2

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2377

Lastpage

2380

Abstract

Fiber Bragg grating (FBG) for measuring stress and strain in 77 K and high magnetic field environment for a high temperature superconducting (HTS) magnet has been studied. The sensing characteristics of FBG in the cryogenic environment were studied on the basis of a series of experiments. To study the strain sensing behavior of FBG at 77 K, the principle of the cantilever which used a aluminum plate clamped at one end and deployed as a cantilever was applied. The results demonstrated that the FBGs still possess good linear strain sensing property at liquid nitrogen temperature. The function of micro-strain and wavelength shift is determined as ??B = 1.23 muez at 77 K. Based on this equation, the hoop strain of a HTS magnet wounded by Bi2223 was measured. The hoop strain difference between the measured results by FBG and the calculated results by ANSYS is very small.

Keywords

Bragg gratings; cryogenics; strain sensors; superconducting magnets; ANSYS; cryogenic environment; fiber Bragg gratings; high temperature superconducting magnet; strain sensing; temperature 77 K; Bragg gratings; Fiber gratings; High temperature superconductors; Magnetic field induced strain; Magnetic field measurement; Strain measurement; Stress measurement; Superconducting magnets; Temperature sensors; Wavelength measurement; HTS coil; liquid nitrogen temperature; strain sensitivity; strain sensor;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2007.899078

Filename

4277801