基于多模光纤偏芯熔接实现温度和折射率同时测量的光纤传感器  

Fiber Sensor for Simultaneous Measurement of Temperature and Refraction Index Based on Multimode Fiber Core-Offset

作　　者：童峥嵘[1] 韩伟[1] 曹晔[1] 

机构地区：[1]天津理工大学薄膜电子与通信器件重点实验室,智能计算及软件新技术重点实验室,天津300384

出　　处：《光学学报》2014年第1期53-57,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61107052);天津市自然科学基金(11JCYBJC00100);天津市青年基金(13JCQNJC01800)

摘　　要：利用偏芯熔接的方法,研制出一种可实现温度和折射率同时测量的光纤传感器。该传感器将一段多模光纤MMF2的左端与一芯径与长度均相同的多模光纤MMF1偏芯熔接,右端与一大芯径多模光纤MMF3对芯熔接构成传感头,利用多模光纤纤芯模和包层模对温度、折射率的敏感性差异,结合敏感矩阵实现了双参量同时测量。实验选取了位于1536.98nm和1545.24nm处的干涉谷进行了温度和折射率的测量,测得1536.98nm处的干涉谷对温度的灵敏度为0.105nm/℃,对折射率不敏感;1545.24nm处的干涉谷对温度的灵敏度为0.052nm/℃,对折射率的敏感性为32.2nm/RIU(RIU表示单位折射率)。该传感器也可应用于其他参量的测量,具有良好的应用前景。A novel fiber interferometer sensor based on core-offset for simultaneously measuring refractive index and temperature is proposed. It makes a multimode fiber MMF2 left weld with a multimode fiber MMF1 which has a same core diameter and length in core-offset way, and right weld with a multimode fiber MMF3 which has a larger core diameter to be the sensor head. By observating the wavelength shifts of the interference dips, temperature and refraction index （RI） can be measured simultaneously since the core modes and the cladding modes have different sensitivities to the two parameters, The dips at 1536. 98 nm and at 1545. 24 nm are chosen to measure the temperature and the RI. Experiments indicate that the temperature sensitivities of the dips at 1536.98 nm and at 1545.24 nm are 0. 105 nm/℃ and 0. 052 nm/℃. The RI sensitivity coefficient of the dip at 1545. 24 nm is 32.2 nm/RIU, whereas the dip at 1536.98 nm is insensitive. This fiber interferometer sensor can also be applied in other sensing fields and has good prospects.

关 键 词：光纤光学 温度和折射率测量 偏芯 干涉传感器 

分 类 号：TN253[电子电信—物理电子学]