光纤形态传感系统研究

海底滑坡监测于自然灾害机理研究和保护人类活动与财产安全都有重要意义，而目前仍没有行之有效的实时监测手段。光纤形态传感器因其具有灵敏度高、耐腐蚀、耐高压，低能耗等优点被应用于结构形态传感领域。

本文针对海底滑坡监测研制了一体自融式光纤形态传感器系统。论文首先介绍了光纤形态传感系统的组成以及基于光纤光栅串的光纤形态传感原理和恢复算法，采样了标准曲率模块对每个传感点进行了标定。开发了基于树莓派的水下管理系统。最后对整个系统进行了实验研究，全向形变测试精度达到单方向弯曲40cm内，最大形态恢复误差小于1.6%。港池测试中系统观测到了5次贯入动作，记录了土层静止状态下90分钟的数据，经过形态恢复传感器首尾两端欧式距离尾端标准差为61μm，相对未弯曲时方向夹角的标准差为0.06°。综合试验结果表明该系统各项功能工作正常，能够有效记录各传感器数据，形态传感器工作稳定，达到设计要求。

The underwater landslide monitoring is of great significance in the research and protection of human activities and property security in natural disaster mechanisms, and there are still no effective real -time monitoring methods. The optical fiber morphology sensor is applied to the field of structural morphology due to the advantages of high sensitivity, corrosion resistance, high pressure resistance, and low energy consumption.

In this paper, an integrated optical fiber shape sensor system is developed for submarine landslide monitoring. The paper first introduces the composition of the fiber optic shape sensing system, the principle of fiber optic shape sensing and the recovery algorithm based on the fiber grating string, and samples the standard curvature module to calibrate each sensing point. Developed an underwater management system based on Raspberry Pi. Finally, the whole system is experimentally studied, and the accuracy of the omnidirectional deformation test reaches within 40cm of bending in one direction, and the maximum shape recovery error is less than 1.6\%. During the harbor basin test, the system observed 5 penetration actions, and recorded 90 minutes of data in the static state of the soil layer. After the form recovery, the standard deviation of the Euclidean distance between the first and last ends of the sensor is 61 μm, and the standard deviation of the angle between the direction and the direction when it is not bent The difference is 0.06°. The comprehensive test results show that all functions of the system work normally, can effectively record the data of each sensor, and the shape sensor works stably, meeting the design requirements.

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