该文设计并制作了一种基于熔融拉锥技术的温度和折射率传感器。该结构是将一段单模光纤(SMF)两端级联无芯光纤(NCF), 并通过火焰熔融拉锥技术把中间的单模光纤进行拉锥处理, 从而构成了马赫-曾德尔光纤干涉仪(MZI), 两个无芯光纤分别充当分束器和耦合器。实验研究了该传感器对于温度和折射率的光谱响应特性, 研究表明, 当温度升高时, 透射光谱出现红移现象, 其响应灵敏度为43.96 pm/℃, 线性度为0.990 5。当传感结构置于折射率1.341 6~1.382 32的蔗糖溶液中时, 透射光谱强度随着折射率的增加而变大, 其响应灵敏度为366.68 dB/RIU, 线性度为0.989。

A temperature and refractive index sensor based on fusion taper technology is designed and fabricated.In this structure,the two ends of a single mode fiber(SMF) are cascaded with the no-core fiber(NCF),and the single mode fiber in the middle is tapered by the flame fusion taper technology, so as to form a Mach-Zehnder fiber interferometer(MZI).The two no-core fibers(NCF) act as beam splitter and coupler respectively.The spectral response characteristics of the sensor to temperature and refractive index are experimentally studied.When the temperature is increased, the transmission spectrum appears red shift phenomenon,the response sensitivity is 43.96 pm/℃,and the linearity is 0.990 5.When the sensing structure is placed in the sucrose solution with a refractive index of 1.341 6~1.382 32, the transmission spectrum intensity increases with the increase of refractive index, the response sensitivity is 366.68 dB/RIU, and the linearity is 0.989.