High-Sensitivity Salinity and Temperature Sensing in Seawater Based on a Microfiber Directional Coupler
High-Sensitivity Salinity and Temperature Sensing in Seawater Based on a Microfiber Directional Coupler
复制标题
基于微光纤定向耦合器的海水中高灵敏度盐度和温度传感
DOI：
10.1109/jphot.2016.2593586
复制
发表时间：
2016-08-01
影响因子：
2.4
通讯作者：
Wang, Jing
中科院分区：
文献类型：
--
作者：
Wang, Shanshan;Yang, Hongjuan;Wang, Jing
提出了一种基于微光纤定向耦合器的简单、高灵敏度、低成本的海水温度和盐度光学传感器。传感倾角的变化对海水中盐度和温度的变化非常敏感，由3.79 μ m和2.20 μ m直径光纤组装的耦合器在930 pm/%和-160 pm/°C处的灵敏度最高。对于直径为3.50和1.35 μm的较小光纤，温度灵敏度可进一步提高到-1130 pm/°C。为了保持其在液体中的稳定结构，提出了一种用乙基纤维素醚膜进行包覆的方法。通过在耦合区涂上乙基纤维素醚溶剂，使耦合器能在海水中稳定工作。该传感器结构简单，成本低，灵敏度高，与光纤系统兼容，可用于海水等液体环境中的微型多功能光学传感器的研制。
A simple, high-sensitivity, and low-cost optical sensor for the measurement of temperature and salinity in seawater is demonstrated based on a microfiber directional coupler. The shifts of sensing dips are highly sensitive to the change of salinity and temperature in seawater with highest sensitivities at 930 pm/% and -160 pm/°C for coupler assembled by 3.79and 2.20-μm-diameter fibers. The temperature sensitivity can be further improved to -1130 pm/°C for smaller fibers with diameters of 3.50 and 1.35 μm. To keep the stable structure in liquid, a methodology of coating using ethyl cellulose ethoce film is proposed. By ethyl cellulose ethoce solvent coating on the coupling area, the coupler can be operated stably in seawater. The sensor demonstrated here is easy to construct, is low cost, is high sensitivity, and is compatible with the optical fiber system, which may find applications in developing miniature and multifunction optical sensors used in seawater and other liquid surroundings.