Experimental Measurements of the Sensitivity of Fiber-optic Bragg Grating Sensors with a Soft Polymeric Coating under Mechanical Loading, Thermal and Magnetic under Cryogenic Conditions
GUAN Ming-Zhi1,2**, WANG Xing-Zhe2, XIN Can-Jie2, ZHOU You-He2, MA Li-Zhen1
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 2Key Laboratory of Mechanics on Western Disaster and Environment, College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000
Abstract：The strain and temperature sensing performance of fiber-optic Bragg gratings (FBGs) with soft polymeric coating, which can be used to sense internal strain in superconducting coils, are evaluated under variable cryogenic field and magnetic field. The response to a temperature and strain change of coated-soft polymeric FBGs is tested by comparing with those of coated-metal FBGs. The results indicate that the coated-soft polymeric FBGs can freely detect temperature and thermal strain, their accuracy and repeatability are also discussed in detail. At variable magnetic field, the tested results indicate that the cross-coupling effects of FBGs with different matrixes are not negligible to measure electromagnetic strain during fast excitation. The present results are expected to be able to provide basis measurements on the strain of pulsed superconducting magnet/cable (cable-around-conduit conductors, cable-in-conduit conductors), independently or utilized together with other strain measurement methods.
. [J]. 中国物理快报, 2015, 32(01): 17401-017401.
GUAN Ming-Zhi, WANG Xing-Zhe, XIN Can-Jie, ZHOU You-He, MA Li-Zhen. Experimental Measurements of the Sensitivity of Fiber-optic Bragg Grating Sensors with a Soft Polymeric Coating under Mechanical Loading, Thermal and Magnetic under Cryogenic Conditions. Chin. Phys. Lett., 2015, 32(01): 17401-017401.
2015, Vol. 32 
