海水溶液的温度、盐度是海洋观测中的两个重要基本参数。目前，对海水温盐度进行测量及传感的方法或灵敏度不高、或成本高昂、响应较慢，且难以实现海洋内部细微结构的高精度探测。基于微纳光纤的传感方法具有结构简单、灵敏度高、响应快等优点。然而对于海水温盐度测量，目前已有的液体折射率传感方案均不能直接适用。因此，结合海水温盐度测量特点，本项目提出基于玻璃微纳米光纤与微纳米压印聚合物（聚酰亚胺）光纤布拉格光栅复合结构的海水温盐度传感器研究方案，理论上通过优化探测系统参数以获得较高的探测灵敏度；实验上制备出包含光纤布拉格光栅和光纤耦合器的复合器件，并演示其在海水温盐度测量中的应用。本项目的完成将为海水温盐度传感提供一种高性能、高效率的光学新方法，对研究海洋科学、保护海洋生态、发展海洋经济等具有现实意义，也为微纳光纤在海洋探测领域的应用及其他实测环境的应用提供重要参考。

Temperature and salinity of seawater are important parameters in oceanographic observation. Presently, most methods for temperature and salinity measurement show disadvantages of high cost, low sensitivity, slow response, and hard to realize the accurate measuring of fine structure in ocean. In contrast, sensing technology based on micro-/nanofibers shows advantages of simple construction, high sensitivity and fast response. However, for temperature and salinity sensing in seawater, the existing methods used in refractive index sensing of liquid are not valid. In this project, we propose the composite structure based on silica micro-/nanofiber and nanoimprinted polymer (polyimide) micro-/nanofiber Bragg grating for seawater temperature and salinity sensing. By optimization of parameters of sensing system, higher sensitivity are obtained. Experimentally, photonics device including microfiber Bragg grating and microfiber coupler is assembled and sensings of temperature and salinity are demonstrated.The project presented here may afford a new method for ocean detection with high efficiency and perfect performance, which is helpful for researching ocean, protecting ocean, and developing ocean economy and may offer important references for applications of micro-/nanofibers in ocean detection.