扫描激光器型光纤光栅解调仪设计
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摘要
设计了一种扫描激光器型光纤光栅波长解调仪,采用滑动平均滤波方法拟合光纤布拉格光栅反射谱,基于扫描激光器输出的同步触发信号与波长对应性,计算得到光纤布拉格光栅反射谱的中心波长,简化了解调过程。相比传统的宽带光源解调方法,降低了解调的复杂度和不稳定性,实现对布拉格波长的高精度、快速解调。实验结果表明,解调仪对光纤布拉格光栅波长的解调稳定性可达±2pm,温度与波长变化的线性度达到0.9984,温度测量误差小于0.5℃,能够满足实际应用的需要。
An optical fiber grating wavelength demodulation instrument based on the swept laser is designed. The fiber Bragg grating reflection spectrum is fitted by the sliding average filtering method. The central wavelength of the reflecting spectrum of the fiber Bragg grating is calculated with the characteristics of the wavelength corresponding to the output synchronized trigger signal of the swept laser, which simplifies the process of demodulation. Compared with the traditional broadband light source demodulation method, the complexity and instability of the demodulation are reduced, and the high-precision and fast demodulation of the wavelength of fiber Bragg grating sensors are realized. The experimental results show that the demodulation instrument achieves the stability of ±2 pm in the wavelength demodulation of the fiber Bragg grating, and the linearity of the change of temperature and wavelength reaches 0.9984, and the measuring error of temperature is less than 0.5℃, which can meet the needs of practical applications.
An optical fiber grating wavelength demodulation instrument based on the swept laser is designed. The fiber Bragg grating reflection spectrum is fitted by the sliding average filtering method. The central wavelength of the reflecting spectrum of the fiber Bragg grating is calculated with the characteristics of the wavelength corresponding to the output synchronized trigger signal of the swept laser, which simplifies the process of demodulation. Compared with the traditional broadband light source demodulation method, the complexity and instability of the demodulation are reduced, and the high-precision and fast demodulation of the wavelength of fiber Bragg grating sensors are realized. The experimental results show that the demodulation instrument achieves the stability of ±2 pm in the wavelength demodulation of the fiber Bragg grating, and the linearity of the change of temperature and wavelength reaches 0.9984, and the measuring error of temperature is less than 0.5℃, which can meet the needs of practical applications.
引文
[1] 徐国权, 熊代余. 光纤光栅传感技术在工程中的应用[J]. 中国光学,2013,6(3):306—317. Xu Guoquan, Xiong Daiyu. Applications of fiber bragg grating sensing technology in engineering[J]. Chinese Journal of Optics,2013,6(3):306—317.
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[6] 曾红燕, 沈常宇, 路艳芳, 等. 基于保偏光纤马赫曾德干涉结合布拉格光纤光栅的折射率传感器[J]. 传感技术学报,2015,28(11):1727—1731. Zeng Hongyan, Shen Changyu, Lu Yanfang, et al. Refractive index sensor based on Polarization-Maintaining Fiber M-Z Interferometer with an FBG[J]. Chinese Journal of Sensors and Actuators,2015,28(11):1727—1731.
[7] 樊彦恩, 武帅, 贺胜男, 等. 基于光纤迈克耳孙干涉仪调解技术的光纤光栅电流传感技术研究[J]. 激光与光电子学进展,2015,52(8):96—101. Fan Yanen, Wu Shuai, He Shengnan, et al. Research on current sensing technology using fiber bragg grating demodulated by fiber michelson interferometer[J]. Laser & Optoelectronics Progress,2015,52(8):96—101.
[8] 罗进, 江山, 熊岩. 基于边缘滤波法的光纤光栅振动传感器解调技术[J]. 激光技术,2013,37(4):469—472. Luo Jin, Jiang Shan, Xiong Yan. Demodulation technique of fiber grating vibration sensor based on the edge filter method[J]. Laser Technology,2013,37(4):469—472.
[9] 詹亚歌, 陆青, 向世清, 等. 优化光纤光栅传感器匹配光栅解调方法的研究[J]. 光子学报,2004,33(6):711—715. Zhan Yage, Lu Qing, Xiang Shiqing, et al. Study on the optimization of matched grating interrogation technique of fiber grating sensor[J]. Acta Photonica Sinica,2004,33(6):711—715.
[10] 盛文娟, 张慧, 杨宁, 等. 基于光纤光栅传感系统的光纤法布里-珀罗滤波器热致非线性研究[J]. 激光与光电子学进展,2017,54(4):296—302. Sheng Wenjuan, Zhang Hui, Yang Ning, et al. Nvestigation on Thermo-Induced nonlinearity of fiber Fabry-Perot filter by using optical fiber sensing system[J]. Laser & Optoelectronics Progress,2017,54(4):296—302.
[11] Yan L S, Yi A, Pan W, et al. A simple demodulation method for FBG temperature sensors using a narrow band wavelength tunable DFB laser[J]. IEEE Photonics Technology Letters,2010,22(18):1391—1393.
[12] 江琴, 何彦璋, 孙义斌. 衍射光栅式光纤光栅解调器件温度特性研究[J]. 光学技术,2015,41(5):433—437. Jiang Qin, He Yanzhang, Sun Yibin. Temperature characteristic research of the FBG demodulation device based on diffraction grating[J]. Optic Technique,2015,41(5):433—437.
[13] 张法业, 姜明顺, 隋青美, 等. 强度解调的光纤光栅振动检测硬件电路设计与实验研究[J]. 传感技术学报,2015,28(12):1760—1765.Zhang Faye, Jiang Mingshun, Sui Qingmei, et al. Hardware circuit design and experimental study of fiber bragg grating vibration detection using intensity demodulation method[J]. Chinese Journal of Sensors and Actuators,2015,28(12):1760—1765.
[14] 陈仲卿, 娄小平, 刘锋, 等. FBG反射谱展宽效应的高速解调算法研究[J]. 光学技术,2017,43(1):7—11.Chen Zhongqing, Lou Xiaoping, Liu Feng, et al. Study on high speed FBG demodulation algorithm in reflection spectrum broadening effect[J].Optic Technique,2017,43(1):7—11.
[15] 李政颖, 刘牧野, 蒋熙馨, 等. 大容量高速光纤光栅解调系统的数据压缩传输[J]. 光电子·激光,2014,25(5):954—961. Li Zhengying, Liu Muye, Jiang Xixin, et al. Data compression and transmission for large-capacity and highspeed FBG interrogation systems[J]. Journal of Optoelectronics·Laser,2014,25(5):954—961.
[2] 曹晔, 刘波, 开桂云, 等. 光纤光栅传感技术研究现状及发展前景[J]. 传感器与微系统,2005,24(12):1—4. Cao Ye, Liu Bo, Kai Guiyun, et al. Present research and perspective development of sensing technology with fiber gratings[J]. Transducer and Microsystem Technologies,2005,24(12):1—4.
[3] 詹亚歌, 向世清, 方祖捷, 等. 光纤光栅传感器的应用[J]. 物理,2004,33(1):58—61. Zhan Yage, Xiang Shiqing, Fang Zujie, et al. Progess in applications and developing prospect of in-fiber bragg grating sensors[J]. Physics,2004,33(1): 58—61.
[4] 李玉龙, 温昌金, 赵诚. 光纤光栅增敏封装工艺及装置研究现状[J]. 激光与红外,2013,43(11):1203—1211. Li Yulong, Wen Changjin, Zhao Cheng. Research status of the sensitivity enhancing and encapsulation technologies & devices of the fiber bragg grating[J]. Laser & Infrared,2013,43(11):1203—1211.
[5] 吴晶, 吴晗平, 黄俊斌, 等. 光纤光栅传感信号解调技术研究进展[J]. 中国光学,2014,7(4):519—531. Wu Jing, Wu Hanping, Huang Junbin, et al. Research progress in signal demodulation technology of fiber bragg grating sensors[J]. Chinese Journal of Optics,2014,7(4):519—531.
[6] 曾红燕, 沈常宇, 路艳芳, 等. 基于保偏光纤马赫曾德干涉结合布拉格光纤光栅的折射率传感器[J]. 传感技术学报,2015,28(11):1727—1731. Zeng Hongyan, Shen Changyu, Lu Yanfang, et al. Refractive index sensor based on Polarization-Maintaining Fiber M-Z Interferometer with an FBG[J]. Chinese Journal of Sensors and Actuators,2015,28(11):1727—1731.
[7] 樊彦恩, 武帅, 贺胜男, 等. 基于光纤迈克耳孙干涉仪调解技术的光纤光栅电流传感技术研究[J]. 激光与光电子学进展,2015,52(8):96—101. Fan Yanen, Wu Shuai, He Shengnan, et al. Research on current sensing technology using fiber bragg grating demodulated by fiber michelson interferometer[J]. Laser & Optoelectronics Progress,2015,52(8):96—101.
[8] 罗进, 江山, 熊岩. 基于边缘滤波法的光纤光栅振动传感器解调技术[J]. 激光技术,2013,37(4):469—472. Luo Jin, Jiang Shan, Xiong Yan. Demodulation technique of fiber grating vibration sensor based on the edge filter method[J]. Laser Technology,2013,37(4):469—472.
[9] 詹亚歌, 陆青, 向世清, 等. 优化光纤光栅传感器匹配光栅解调方法的研究[J]. 光子学报,2004,33(6):711—715. Zhan Yage, Lu Qing, Xiang Shiqing, et al. Study on the optimization of matched grating interrogation technique of fiber grating sensor[J]. Acta Photonica Sinica,2004,33(6):711—715.
[10] 盛文娟, 张慧, 杨宁, 等. 基于光纤光栅传感系统的光纤法布里-珀罗滤波器热致非线性研究[J]. 激光与光电子学进展,2017,54(4):296—302. Sheng Wenjuan, Zhang Hui, Yang Ning, et al. Nvestigation on Thermo-Induced nonlinearity of fiber Fabry-Perot filter by using optical fiber sensing system[J]. Laser & Optoelectronics Progress,2017,54(4):296—302.
[11] Yan L S, Yi A, Pan W, et al. A simple demodulation method for FBG temperature sensors using a narrow band wavelength tunable DFB laser[J]. IEEE Photonics Technology Letters,2010,22(18):1391—1393.
[12] 江琴, 何彦璋, 孙义斌. 衍射光栅式光纤光栅解调器件温度特性研究[J]. 光学技术,2015,41(5):433—437. Jiang Qin, He Yanzhang, Sun Yibin. Temperature characteristic research of the FBG demodulation device based on diffraction grating[J]. Optic Technique,2015,41(5):433—437.
[13] 张法业, 姜明顺, 隋青美, 等. 强度解调的光纤光栅振动检测硬件电路设计与实验研究[J]. 传感技术学报,2015,28(12):1760—1765.Zhang Faye, Jiang Mingshun, Sui Qingmei, et al. Hardware circuit design and experimental study of fiber bragg grating vibration detection using intensity demodulation method[J]. Chinese Journal of Sensors and Actuators,2015,28(12):1760—1765.
[14] 陈仲卿, 娄小平, 刘锋, 等. FBG反射谱展宽效应的高速解调算法研究[J]. 光学技术,2017,43(1):7—11.Chen Zhongqing, Lou Xiaoping, Liu Feng, et al. Study on high speed FBG demodulation algorithm in reflection spectrum broadening effect[J].Optic Technique,2017,43(1):7—11.
[15] 李政颖, 刘牧野, 蒋熙馨, 等. 大容量高速光纤光栅解调系统的数据压缩传输[J]. 光电子·激光,2014,25(5):954—961. Li Zhengying, Liu Muye, Jiang Xixin, et al. Data compression and transmission for large-capacity and highspeed FBG interrogation systems[J]. Journal of Optoelectronics·Laser,2014,25(5):954—961.