摘要
本文提出了一种基于全光纤马赫-曾德尔(Mach-Zehnder)干涉式光纤温度传感器结构,是在单模光纤(SMF)上熔接一段30mm长的细芯径光纤,利用光纤的纤芯模和包层模对温度灵敏度的差异,来测量在不同波长处的波长温度关系,实现对温度的测量。实验中我们分别对波长1531.2375nm和1544.39nm处的干涉波谷进行测量,得到两个波谷的温度灵敏度分别为89pm/℃和94.7pm/℃,该温度灵敏度系数远远大于光纤布拉格光栅,且测试曲线呈现很好的线性度。该类传感器具有结构简单、温度灵敏度高、造价低等优点。
In this paper, an all fiber fiber temperature sensor based on Mach-Zechnder interferometer （MZI） structure is proposed and experimentally studied. The fiber sensor is constructed by a sandwiching structure with a thin core fiber as 30mm length that was spliced between two standard single mode fibers. By measurement two different interference wavelength dips at 1531.2375nm and 1544.9nm, respectively, shift with temperature, its temperature characteristics are studied. Since the effective refractive index of core modes and cladding modes are different sensitivities to the temperature, the different dips wavelength display different temperature sensitivities with 89pm/℃ and 94.7pm/℃, respectively, which much larger than that of fiber Bragg grating, and very good linearity degree.The sensor has the advantages of simple structure, high temperature sensitivity and low cost
出处
《中国新通信》
2017年第2期26-28,共3页
China New Telecommunications
关键词
光纤传感器
马赫曾德尔干涉仪
温度
fiber sensor
Mach-Zehnder interferometer （MZI）
temperature
