基于错位偏移无芯光纤的高灵敏度湿度传感器

High Sensitivity Humidity Sensor Based on Dislocation Core Offset Coreless Fiber

提出一种通过错位偏移拼接的高灵敏度光纤湿度传感器,使用无芯光纤进行错位结构熔接,形成马赫-曾德尔干涉结构。在结构的错位端面采用具有良好吸水性的聚乙烯醇(PVA)作为涂覆层材料,对传感器进行了理论与试验的研究。实验结果表明:所提出的传感器具有良好的折射率特性和湿度特性,灵敏度可达-77.4284 nm/RIU,此外涂覆PVA的传感器在测量湿度的同时提高光纤传感器的机械强度,使错位光纤传感器在工程应用中得以应用。

A kind of high sensitivity optical fiber humidity sensor fabricated by dislocation core-offset was proposed in this paper.The Mach-Zehnder interference structure was formed by dislocation fusion of coreless optical fiber.Polyvinyl alcohol(PVA)with good water absorption was used as the coating material on the dislocation end face of the structure.The sensor was studied theoretically and experimentally.Experimental results show that the proposed sensor has good refractive index and humidity characteristics,and the sensitivity is up to-77.4284 nm/RIU.In addition,the PVA coated sensor can improve the mechanical strength of the fiber sensor while measuring humidity.The dislocation core-offset optical fiber sensor can be used in engineering applications.