| 光谱学与光谱分析 |
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| Research on the Reflection Spectrum of Linear Chirped Fiber Bragg Grating under the Impact of Dynamic Stress |
| WANG Jing1, 2, JIANG Shan-chao2, SHI Bin1, SUI Qing-mei2*, WANG Zheng-fang2, LI Xiao-fei2, WANG Ning2, YANG Shuai2 |
1. School of Earth Science and Engineering, Nanjing University, Nanjing 210093, China
2. School of Control Science and Engineering, Shandong University, Ji’nan 250061, China |
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Abstract Dynastic stress field detection based on the linear chirped fiber Bragg grating (LCFBG) was proposed. Firstly, the reflectance spectra strain sensing model of LCFBG adopting the transfer matrix method was constructed, and attenuation sine function was used to simulate the dynamic stress field along LCFBG. In the simulation experiment, the responding character of LCFBG reflection spectrum to different amplitude, different attenuation coefficient and different propagation speed of dynamic stress was studied in detail. The simulation results show that the reflectivity, wavelength and spectral shape of LCFBG reflection spectrum are related to the dynamic stress. However, the LCFBG reflection spectrum has different response to different parameters of dynamic stress. In a range, maximum reflectivity of LCFBG reflectance spectra increases when the amplitude and propagation speed of dynastic stress field becomes larger, but it decreases when the attenuation coefficient increases. Eventually, vibration sensor using LCFBG as the sensing element was designed, and then LCFBG dynamic stress fluctuations experiment platform was build. The data obtained from experiment agrees with the simulation results. Therefore, a novel detection method of dynamic stress field through real-time acquisition of LCFBG full spectral information is proposed in this article.
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Received: 2013-09-12
Accepted: 2014-01-21
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Corresponding Authors:
SUI Qing-mei
E-mail: qmsui@sdu.edu.cn
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