基于拉丝塔光纤光栅干涉仪的海洋温盐深传感器阵列基础研究

海洋是地球上最大未知区域，通过大规模获取海洋温度、盐度和深度，为海洋研究和开发提供重要科学依据，是国家经略海洋的重要内容。但是既有的海洋温盐深(CTD)探测传感器精度不高、环境适应性差，多传感器复用组成阵列的规模不大、分布密度不高，不能实现大范围、高空间分辨探测，急需能在时间和空间上进行连续高精度探测的手段。本项目据此提出在单根光纤上大规模密集集成高灵敏度干涉仪，获得一种全新CTD光纤传感器阵列，解决既有技术不能实现高灵敏、大规模、高空间分辨率实时在线探测的系列基础问题。需要研究拉丝塔光纤光栅阵列CTD传感机理与实现方法，研究CTD光纤传感器及其增敏方法、单纤高密度集成大规模多参数光纤传感器阵列特性、三维矩阵式CTD阵列信号解调方法，并通过实验室和船池模拟实验验证，获得单纤集成数千个由米级间距光纤干涉仪构成的CTD传感器阵列，对引领海洋探测技术的发展，具有十分重大理论意义和应用价值。

The ocean is the largest unknown area on earth. It is an important part of the country ’s strategy of ocean management to provide an important scientific basis for ocean research and development through obtaining ocean temperature, salinity and depth information on a large scale. However, the existing ocean temperature and salt depth (conductivity-temperature-depth: CTD) detection sensors have low accuracy and poor environmental adaptability, the scale of multi-sensor multiplexing arrays is not large in scale and distribution density is not high. It is impossible to achieve large-scale and high spatial resolution detection. For detection, there is an urgent need for continuous high-precision monitoring in time and space. This proposal proposes a novel CTD optical fiber sensor array through large-scale integrating high-sensitivity interferometers on a single optical fiber, which solves the problems that the existing technology cannot achieve high-sensitivity, large-scale, and high spatial resolution real-time online detection. Need to study the drawing mechanism and realization method of the CTD fiber-optic grating array, the CTD fiber-optic sensor, and its sensitization mechanism, the characteristics of the single-fiber high-density integrated large-scale multi-parameter fiber-optic sensor array, the three-dimensional matrix CTD array signal demodulation method, and through laboratory and ship pond simulation experiments. The novel method, which can obtain thousands of CTD sensor arrays integrated on single-fiber and composed of meter-level pitch fiber interferometers, is of great theoretical significance and application value for leading the development of marine detection technology.