论文部分内容阅读
提出一种结构简单且灵敏度高的液体封装结构光纤马赫-曾德干涉仪(MZI)温度传感器,并对其折射率和温度响应特性进行了理论分析和实验研究。3段单模光纤(SMF)采用锥腰扩大熔接技术顺次熔接构成同轴式光纤MZI,结果表明MZI对环境折射率非常敏感;然后,将MZI封装在充满Cargille液体的毛细管中,结果表明液封后的MZI在测试温度范围内(10~40℃)的灵敏度约150pm/℃,较之封装前提高了1倍,且远高于大多数的光纤光栅和其它光纤干涉仪型温度传感器。本文MZI温度传感器还具有良好的物理强度和易于制备等优点,在环境监测和食品工业等领域具有良好的应用前景。
A simple and sensitive liquid-crystal fiber-optic Mach-Zehnder interferometer (MZI) temperature sensor with simple structure and high sensitivity is proposed. The refractive index and temperature response characteristics of the fiber are analyzed theoretically and experimentally. Three-stage single-mode fiber (SMF) was fused using a taper lumbar splicing technique to form a coaxial fiber MZI. The results showed that MZI was very sensitive to the ambient refractive index. Then, the MZI was encapsulated in a capillary filled with Cargille liquid. The sealed MZI has a sensitivity of about 150 μm / ° C over the test temperature range (10 to 40 ° C), a factor of two more than before packaging and much higher than most fiber gratings and other fiber-optic interferometer-type temperature sensors. This article MZI temperature sensor also has good physical strength and easy preparation, etc., in the field of environmental monitoring and food industry has good application prospects.