高灵敏保偏光纤模式干涉温度传感研究

Research on High Sensitive Polarization-Maintaining Fiber Mode Interferometric Temperature Sensing

该文介绍了一种灵敏度较高的Mach-Zehender干涉温度传感器,在单模光纤之间嵌入一段保偏光纤,并通过重叠挤压放电方式形成反向凸起锥,形成单模光纤-保偏凸锥形光纤-单模光纤结构的传感器,凸锥结构增加了包层模式的能量,提高了传感器透射谱对比度。实验证明,当保偏光纤长度为2.5 cm时,在30~70℃内温度灵敏度达到最大值126.45 pm/℃。此外,该文通过计算不同偏振模式及相应的模式传播常数,分析得到参与模式干涉的主要成分,从而验证了温度灵敏度测试的精准度。此结构的传感器具有结构紧凑、尺寸小、制作工艺简单的特点,可被应用于温度传感测量。

In this paper,a Mach-Zehender interference temperature sensor with high sensitivity is introduced.A section of polarization-maintaining fiber is embedded between single-mode fiber,and by overlapping extrusion discharge to form a reverse convex cone,a sensor with a structure of single mode fiber-polarization-maintaining convex cone fiber-single mode fiber is realized.The convex cone structure increases the energy of the cladding mode and improves the contrast of the transmission spectrum of the sensor.The experiments show that when the length of polarization-maintaining fiber is 2.5 cm,the maximum temperature sensitivity reaches 126.45 pm/℃ within the range of 30~70 ℃.In addition,in this paper,the main components involved in mode interference are analyzed by calculating different polarization modes and corresponding mode propagation constants,thereby verying the accuracy of temperature sensitivity measurement.The sensor with this structure has the characteristics of compact structure,small size and simple manufacturing process,which can be applied to temperature sensing measurement.