基于光纤光栅传感技术的斜拉索智能监测

Intelligent monitoring of pulling cable technology based on Fiber Bragg Grating sensor

斜拉索传统监测方法在长期使用中测试结果易失真,误差较大,设备耐久性较差,并且斜拉索内部的温度、湿度及锈蚀状况无法直接测量。将光纤光栅传感技术用于斜拉索监测,采用斜拉索智能应力传感器、温度传感器、湿度及腐蚀传感器,当斜拉索使用环境变化时,信息经光纤传送到光电信号处理器,数据经过处理后,传到控制系统,通过控制系统内设置的报警装置,实现斜拉索内部状况的动态监测及警报。指出光纤光栅传感技术用于斜拉索需要解决的问题:光纤光栅的强度要满足要求,冷铸锚、热铸锚最高使用温度约为250℃,500℃,寻找合理的光纤埋入工艺,以及开发可以同时测量温度和应力并消除两者相互影响的传感器。

Testing results of traditional pulling cable monitoring distorted easily in long term use. Error is big. Durability of products is poor. Interior temperature, moisture and corrosion condition in pulling cable can＇ t be tested directly. To apply Fiber Bragg Grating sensing technology to pulling cable monitoning, to adopt pulling cable intelligent stress sensor, temper- ature sensor, moisture and corrosion sensor, through fiber inibrmation is conveyed to photo-electric signal sensor when pulling cable environment changes, the data are transferred to control system after processed, dynamic monitoring and alarmreporting of pulling cable interior condition can be realized. The problems of applying Fiber Bragg Grating sensing technology to pulling cable needing to be solved are pointed out. The strength of Fiber Bragg Grating reaches requirement. The using temperature of cold-cast anchor and hot-cast anchor reaches at 250℃, 500℃ or so respectively. To find reasonable fiber embedding technology and develop sensor which can survey temperature and stress and eliminate interaction of sensors.