宽带光源入射下单模-多模-单模全光纤电流传感器特性研究  

Investigation of Characteristics of Single mode-Multimode-Single mode All-Fiber Optic Current Sensor with Broadband Light Source Inputting

作　　者：张荣香[1,2,3] 韩群[1,2] 刘铁根[1,2] 陈耀飞[1,2] 李琳[1,2] 

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]光电信息技术教育部重点实验室(天津大学),天津300072 [3]河北大学物理科学与技术学院,河北保定071002

出　　处：《中国激光》2014年第7期149-155,共7页Chinese Journal of Lasers

基　　金：国家重大科学仪器设备开发专项(2013YQ03091502);国家自然科学基金(61107035);天津市自然科学基金(13JCYBJC16100)

摘　　要：建立了基于单模-多模-单模光纤结构和磁流体的全光纤电流传感器,此传感器能够通过检测透射光谱的特征波长漂移和传输损耗变化两种方法来探测电流。对于第一种方法,得到电流灵敏度为1243.7pm/A[77.9pm/Oe,1Oe=1/(4π)×103 A/m];对于第二种方法,传感特性依赖于波长的选择,分析了不同波长条件下传感器传输损耗的变化特性。结果表明:选择单波长时,传感特性受波长的影响,且传输损耗变化小,从而灵敏度小;使用宽波长范围内的总传输损耗时,传输损耗变化大,电流检测灵敏度大大加强,所得灵敏度为506.2dB/A(31.7dB/Oe),分别是单波长1529nm和1611nm下灵敏度的337倍和723倍。在自发辐射宽带光源入射条件下,利用探测器直接检测传感器输出光强的变化,得到26.8V/A(1.7V/Oe)的电流灵敏度。A single mode-multimode-single mode fiber optic structure and magnetic fluid based all-fiber optic current sensor,which can be interrogated by monitoring the dip wavelength shift or transmission loss of the transmission spectrum,is designed.For the first interrogation method,the current sensitivity of 1243.7 pm/A [77.9 pm/Oe,1 Oe=1/（4π）×10^3 A/m]is obtained.For the second way,the sensing property depends on wavelength.By analyzing the rule of the change of transmission loss under different wavelengths,it is found that when a specified wavelength is used,the sensing property is influenced by different wavelengths and the variation of transmission loss is little,leading to a small sensitivity.When the all transmission loss during broad wavelength range of source is employed,the change of transmission loss is obvious,and hence the current sensitivity is greatly enhanced.The obtained sensitivity of 506.2 dB/A（31.7 dB/Oe）is 337 times and 723 times larger than those under 1529 nm and 1611 nm,respectively.Furthermore,the sensitivity of 26.8 V/A（1.7 V/Oe）is achieved by detecting the output intensity using detector with amplified spontaneous emission broadband light source inputting.

关 键 词：光纤光学 电流传感器 单模-多模-单模 磁流体 宽带光源 

分 类 号：TN253[电子电信—物理电子学]