中国激光, 2017, 44 (12): 1204007, 网络出版: 2017-12-11   

基于光纤开放式法布里-珀罗干涉仪的液体折射率测量 下载: 509次

Refractive Index Measurement of Liquid Based on Open Fiber Fabry-Perot Interferometer
作者单位
大连理工大学物理与光电工程学院, 辽宁 大连 116024
摘要
法布里-珀罗(F-P)干涉仪结构的光纤传感器因其结构简单、体积小、高灵敏度等优点得到了广泛的应用, 开放式法布里-珀罗干涉仪传感器可对待测液体的折射率进行测量。利用机械切割、飞秒激光击穿等方法可以制成开放式法布里-珀罗干涉仪。利用玻璃焊剂将开放的空心毛细管和两段单模光纤焊接在一起, 制成开放式法布里-珀罗干涉仪传感器, 并采用交叉相关的信号处理技术实现对待测液体折射率的绝对测量。采用不同浓度的氯化钠溶液进行折射率测量实验, 折射率测量分辨率可达到10-5 RIU量级, 传感器的温度灵敏度为39.59 nm/℃。
Abstract
Fiber optic sensors based on the Fabry-Perot (F-P) interferometer have been widely used because of its simple structure, small size, and high sensitivity. The refractive index of liquid can be measured by the open F-P interferometer. We can make an open F-P interferometer through mechanical cutting, femtosecond laser breakdown and some other methods. An open F-P interferometer sensor is fabricated with an open hollow capillary and two segments of single-mode fibers welded together by glass flux. Absolute measurement of refractive index of liquid can be achieved when the cross-correlation signal processing technology is used. Refractive index measurement experiments are performed for NaCl solutions with different concentrations. The measurement resolution for refractive index can reach 10-5 RIU magnitude, and the temperature sensitivity of the sensor is 39.59 nm/℃.
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宋鹏, 荆振国, 李昂, 郭铖, 彭伟. 基于光纤开放式法布里-珀罗干涉仪的液体折射率测量[J]. 中国激光, 2017, 44(12): 1204007. Song Peng, Jing Zhenguo, Li Ang, Guo Cheng, Peng Wei. Refractive Index Measurement of Liquid Based on Open Fiber Fabry-Perot Interferometer[J]. Chinese Journal of Lasers, 2017, 44(12): 1204007.

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