Reyes-Vera Erick, Cordeiro Cristiano M B, Torres Pedro
Appl Opt. 2017 Jan 10;56(2):156-162. doi: 10.1364/AO.56.000156.
A highly sensitive temperature sensor based on an all-fiber Sagnac loop interferometer combined with metal-filled side-hole photonic crystal fiber (PCF) is proposed and demonstrated. PCFs containing two side holes filled with metal offer a structure that can be modified to create a change in the birefringence of the fiber by the expansion of the filler metal. Bismuth and indium were used to examine the effect of filler metal on the temperature sensitivity of the fiber-optic temperature sensor. It was found from measurements that a very high temperature sensitivity of -9.0 nm/°C could be achieved with the indium-filled side-hole PCF. The experimental results are compared to numerical simulations with good agreement. It is shown that the high temperature sensitivity of the sensor is attributed to the fiber microstructure, which has a significant influence on the modulation of the birefringence caused by the expansion of the metal-filled holes.
提出并演示了一种基于全光纤萨格纳克环干涉仪与金属填充边孔光子晶体光纤（PCF）相结合的高灵敏度温度传感器。含有两个填充金属的边孔的光子晶体光纤提供了一种结构，该结构可通过填充金属的膨胀来改变光纤的双折射。使用铋和铟来研究填充金属对光纤温度传感器温度灵敏度的影响。通过测量发现，填充铟的边孔光子晶体光纤可实现-9.0 nm/°C的极高温度灵敏度。实验结果与数值模拟进行了比较，吻合良好。结果表明，该传感器的高温度灵敏度归因于光纤微观结构，其对由填充金属孔膨胀引起的双折射调制有显著影响。
