In this work, simple all-fiber sensors are developed based on a balloon shaped single mode fiber (SMF) structure together with core diameter mismatch (CDM) structures to measure salinity and temperature. The balloon shaped SMF structure as well as the CDM structures are based on the Mach–Zehnder interferometer. Experimental results show that the maximum sensitivity of salinity is 168.35 pm/% of NaCl in saline solution in the range from 5 to 35% and the maximum sensitivity of temperature ranging from 21 to 42 °C is 735.6 pm/°C. The feasibility of simultaneously measuring temperature and salinity with the present sensors has been successfully demonstrated.

中文翻译：

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用于盐度和温度同时测量的全光纤传感器

在这项工作中，基于气球状单模光纤 (SMF) 结构和芯径失配 (CDM) 结构开发了简单的全光纤传感器，以测量盐度和温度。气球形 SMF 结构以及 CDM 结构均基于 Mach-Zehnder 干涉仪。实验结果表明，盐度在5~35%范围内对NaCl的最大灵敏度为168.35 pm/%，对21~42°C温度范围的最大灵敏度为735.6 pm/°C。已经成功证明了使用本传感器同时测量温度和盐度的可行性。