光学技术, 2017, 43 (6): 488, 网络出版: 2017-12-25
在线型光纤法布里-珀罗折射率传感器及光谱分析方法研究
In-line optical fiber Fabry-Perot refractometer and interference spectrum analysis method
导波光学 光纤传感器 法布里-珀罗干涉 折射率测量 解调方法 waveguide optics optical fiber sensor Fabry-Perot interference refractive index measurement demodulation method
摘要
提出一种在线型光纤法布里-珀罗折射率传感器。传感器由空芯光子晶体光纤两端熔接单模光纤而成。理论分析并实验验证了其折射率传感特性。结果表明, 干涉条纹对比度随溶液折射率的增加而减小, 与理论模拟一致。提出利用标准差解调方法对干涉谱进行分析, 标准差解调方法具有更好的线性度和准确性, 可靠性更高, 便于编程实现自动化、快速的数据分析和溶液折射率的实时检测。
Abstract
An in-line fiber Fabry-Perot (F-P) refractive index (RI) sensor is proposed. The sensor is formed by splicing both ends of a short section of hollow-core photonic crystal fiber (HCPCF) to single mode fibers (SMFs). RI response of the sensor is analyzed theoretically and demonstrated experimentally. Results show that the fringe contrast of interference spectrum decreases as the external RI increases, which is consistent with theory. A new demodulation method based on standard deviation analysis is proposed. The method provides the better linearity and accuracy, higher reliability. Moreover, it’s convenient for automatic and fast signal processing in real-time monitoring of RI.
刘晓慧, 姜明顺, 隋青美, 耿湘宜, 宋福荣. 在线型光纤法布里-珀罗折射率传感器及光谱分析方法研究[J]. 光学技术, 2017, 43(6): 488. LIU Xiaohui, JIANG Mingshun, SUI Qingmei, GENG Xiangyi, SONG Furong. In-line optical fiber Fabry-Perot refractometer and interference spectrum analysis method[J]. Optical Technique, 2017, 43(6): 488.