Deformation and stress are the most important parameters for structural damage identification, but the sensors used for structural deformation or stress monitoring cannot be effectively installed on the pipeline with insulation layer, highway, railway and other service structures. In this case, the unfavorable load identification is of great significance for the damage assessment of large-scale structures. The distributed optical fiber vibration sensor (DOFVS) can realize continuous vibration monitoring for tens of kilometers, but the identification accuracy of vibration load is vulnerable to environmental vibration interference and the local position accuracy is not high. In this paper, one multi-scale load identification system based on distributed optical fiber and local FBG (fiber Bragg grating)-based vibration sensors are developed for solving this problem. In this system, the local FBG-based acceleration sensors (also known as FBG-based vibration sensors) are arranged in the area prone to adverse vibration loads for high precision measurement. The distributed optical fiber vibration sensors are continuously deployed in the structure for full scale measurement. In order to verify the feasibility of the load identification system, a field load identification test is carried out, and the distributed optical fiber vibration sensor and the FBG-based acceleration sensor are compared for use to monitor the vibration signals caused by different types of vibration loads. Test results show that the FBG-based acceleration sensor belongs to fixed-point positioning, the distributed optical fiber vibration senor belongs to large-scale positioning, and the vibration responses of the two sensors have good consistency.

变形和应力是识别结构损伤的最重要参数，但是用于结构变形或应力监测的传感器不能有效地安装在具有绝缘层，公路，铁路和其他服务结构的管道上。在这种情况下，不利的载荷识别对于大型结构的损伤评估具有重要意义。分布式光纤振动传感器（DOFVS）可以实现几十公里的连续振动监测，但是振动载荷的识别精度容易受到环境振动的干扰，局部位置精度不高。在本文中，为了解决这个问题，开发了一种基于分布式光纤和基于局部FBG（光纤布拉格光栅）的振动传感器的多尺度负载识别系统。在该系统中，基于局部FBG的加速度传感器（也称为基于FBG的振动传感器）被布置在易于产生不利振动负荷的区域，以实现高精度测量。分布式光纤振动传感器连续部署在结构中以进行全面测量。为了验证负荷识别系统的可行性，进行了现场负荷识别测试，比较了分布式光纤振动传感器和基于FBG的加速度传感器，以监测不同类型的振动引起的振动信号。负载。