| 基于TS-DFT高速光谱解调的FBG温度分布检测 |
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| 引用本文： | 杨梅,陈娜,刘真民,商娅娜,刘书朋,陈振宜,王廷云.基于TS-DFT高速光谱解调的FBG温度分布检测[J].应用科学学报,2023,41(2):252-261. |
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| 作者姓名： | 杨梅 陈娜 刘真民 商娅娜 刘书朋 陈振宜 王廷云 |
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| 作者单位： | 1. 上海大学 特种光纤与光接入网重点实验室, 上海 200444;2. 上海大学 特种光纤与先进通信国际合作联合实验室, 上海 200444 |
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| 基金项目： | 国家自然科学基金（No.62027818）；高等学校学科创新引智计划（111计划）（No.D20031）资助 |
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| 摘 要： | 基于时间拉伸-色散傅里叶变换（time-stretch dispersive Fourier transformation,TS-DFT）技术实现了光纤布拉格光栅反射谱高速解调。解调系统由锁模激光器、环行器、色散补偿光纤、参考光栅、传感光栅以及数据采集和处理模块组成。实验得到了传感光栅在不同温度场下的时域映射光谱，通过与光谱仪测量光谱对比，验证了系统高速光谱解调能力，解调速率为51.2 MHz。结合光谱反演算法得到了沿光栅轴向的温度分布，空间分辨率为200μm，实现了传感光栅高速、高空间分辨率温度传感。
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| 关 键 词： | 光纤布拉格光栅 时间拉伸色散傅里叶变换 分布式传感 高速解调 |
| 收稿时间： | 2021-06-08 |
FBG Temperature Distribution Detection Based on TS-DFT High Speed Spectral Demodulation |
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| YANG Mei,CHEN Na,LIU Zhenmin,SHANG Yana,LIU Shupeng,CHEN Zhenyi,WANG Tingyun.FBG Temperature Distribution Detection Based on TS-DFT High Speed Spectral Demodulation[J].Journal of Applied Sciences,2023,41(2):252-261. |
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| Authors: | YANG Mei CHEN Na LIU Zhenmin SHANG Yana LIU Shupeng CHEN Zhenyi WANG Tingyun |
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| Institution: | 1. Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China;2. Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai 200444, China |
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| Abstract: | In this paper, high speed demodulation of fiber Bragg grating (FBG) reflectivity spectrum is realized based on time-stretch dispersive Fourier transformation (TS-DFT). The demodulation system consists of mode-locked laser, optical circulator, dispersion compensating fiber, reference FBG, sensing FBG, and data collection and processing module. The time domain mapping spectra of sensing FBG under different temperature fields were obtained in experiments. By comparison with the measured spectra of the optical spectrum analyzer, the high-speed spectral demodulation ability of the system is verified, and the demodulation rate is 51.2 MHz. Combined with the spectral inversion algorithm, the temperature distribution along the axis of sensing FBG is obtained, and the spatial resolution is 200 mm. Therefore, temperature sensing with high speed and high spatial resolution is realized. |
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| Keywords: | fiber Bragg grating (FBG) time-stretch dispersive Fourier transformation (TS-DFT) distributed sensing high-speed demodulation |
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