天津城建大学计算机与信息工程学院，天津 300384
针对光纤Bragg光栅（FBG）解调系统中FBG反射谱因包含高斯白噪声、工频噪声而导致解调误差大、解调系统稳定性差的问题，提出一种基于高斯差分（DoG）的FBG峰值检测算法。利用该算法对包含大量噪声的FBG反射谱信号进行峰值检测，平均误差为4 pm，标准差为4.2 pm，相比其他传统算法误差最小。实验结果表明，DoG算法稳定性高，解调误差小，能够明显地降低噪声对FBG反射谱的影响，提高了FBG解调系统的解调精度。
光纤光学 光纤Bragg光栅 反射谱 DoG算法 峰值检测 激光与光电子学进展
2021, 58(7): 0706002
Author Affiliations
Abstract
1 School of Precision Instrument and Opto-Electronics Engineering, Key Laboratory of Micro Opto-electro Mechanical System Technology, Institute of Optical Fiber Sensing of Tianjin University, Tianjin Optical Fiber Sensing Engineering Center, Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, Tianjin 300072, China
2 School of Computer and Information Engineering, Tianjin Chengjian University, Tianjin 300384, China
A flow measurement system consisting of an optical fiber Fabry–Perot (F-P) sensor and an elbow tube is proposed and demonstrated to realize flow measurements and eliminate thermal disturbance. Two F-P sensors are symmetrically mounted on the inner-wall surface of the elbow of 90° in order to eliminate the effect of thermal disturbance to the flow measurement accuracy. Experimental results show that the absolute phase difference is the square root of the fluid flow. It is consistent with the theoretical analysis, which proves that the flow measurement method can measure flow and eliminate the influence of thermal disturbance simultaneously.
060.2300 Fiber measurements 120.4530 Optical constants 120.2230 Fabry-Perot Chinese Optics Letters
2017, 15(4): 040601
Author Affiliations
Abstract
1 Key Laboratory of Optoelectronics Information Technology, Institute of Optical Fiber Sensing of Tianjin University, MEC, Tianjin 300072, China
2 School of Computer and Information Engineering, Tianjin Chengjian University, Tianjin 300384, China
A new wavelength division multiplexing method for fiber Bragg grating (FBG) sensors based on spectrum profile identification is proposed. In this method, FBGs and tilted FBG (TFBG) sensors are cascaded in a single fiber in one sensing channel. The different spectrum profiles enable the cross-correlation method to demodulate the wavelength. Therefore, the different types of sensors can occupy the same central wavelength band. Using this method, the multiplexing capacity is optimized. Experiment results demonstrate the feasibility of this method and it is useful for applications where large numbers of FBGs are needed.
060.0060 Fiber optics and optical communications 060.3735 Fiber Bragg gratings 060.2370 Fiber optics sensors Chinese Optics Letters
2017, 15(7): 070605
天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 光纤传感研究所, 天津 300072
针对可调谐光纤法布里珀罗滤波器(FFP-TF)在环境温度变化过程中扫频非线性曲线的随机波动增大, 引起光纤布拉格光栅(FBG)传感系统解调不稳定的现象, 提出了基于光纤迈克耳孙辅助干涉仪的一种稳定解调性能的方法, 通过辅助干涉仪实现了对法布里珀罗标准具光波长间隔的细分, 编制了局部光频细分解调算法。利用搭建的光谱周期为9.53 GHz的辅助干涉仪进行了变温解调实验研究, 结果表明, 以往未引入光纤辅助干涉仪的波长解调值波动的最大幅度为±28.5 pm, 标准差为8.6 pm; 引入辅助干涉仪的波长解调值波动的最大幅度为±3.5 pm, 标准差为1.4 pm, 有效提高了变温过程中的光纤光栅传感解调波长稳定性。
光纤光学 光纤传感器 辅助干涉仪 变温 光纤布拉格光栅 非线性 光学学报
2016, 36(12): 1206001
天津大学精密仪器与光电子工程学院, 天津大学光纤传感研究所, 光电信息技术教育部重点实验室, 天津 300072
为实现温度稳定的光纤光栅传感解调，提出了综合使用法布里-珀罗(F-P)标准具和乙炔气室进行实时复合波长参考的校正方法。分析了F-P标准具透射光谱和乙炔气室吸收光谱的温度漂移特性。建立实验系统，测试了F-P标准具透射光谱的温度漂移特性，实验显示F-P标准具谱线平均温度灵敏度为1.16 pm/℃，谱线温度重复性误差可达13.0 pm。进行了基于F-P标准具单独参考和基于复合波长参考的解调温度稳定性实验，实验结果表明0 ℃~55 ℃的高低温循环，基于F-P标准具单独参考的解调值变化范围为±32.7 pm，标准差为20.7 pm，基于复合波长参考的解调值变化范围为±1.2 pm，标准差为0.39 pm，解调值变化范围温度稳定性提高了27倍。
光纤光学 光纤传感 光纤光栅 波长参考 气体吸收谱 标准具 光学学报
2015, 35(10): 1006005
