Based On Fiber Bragg Grating Sensor Network Health Monitoring Technology,

This text was directed at the effective demand of the structure health monitor, combining with the existing instrument equipments of the laboratory, and some researches about the content which is related to the structure health monitor technique based on the FBG sensing network was carried on, main now below a few aspects:Firstly, based on the Bragg Square, the sensing properties and the cross sensitivity problems of FBG have been analyzed. Then, the principle and technique for temperature compensation are given when the FBG was used as a strain sensor. Finally, the FBG sensing properties have been studied by the experiments of displacement stretch and temperature calibration. The research results showed that the Bragg wavelength has a good line sexual behavior with the strain and the temperature, and the experimental results of the 11.5pm/℃ and 1.12pm/με fit together with the theories analyses.Secondly, the contrast selects by examinations experiment of glue that used to package the FBG has been processed systematically, and the results showed that KD504, J39 and kuailaoda were the packaged glue and the KD504 was high-quality glue.Thirdly, taken the need of the structure health monitor into account, the structure design, the materials selection, and the packaged techniques for packaged FBG sensors have been studied. On the basis of these researches, mental slice packaged FBG strain and temperature sensors have been developed, and Its sensing properties have been studied by using materialstretch and temperature calibration experiments respectively, as a result express that the packaged FBG sensors were excellent to monitor the structural surface strain and temperature.Fourthly, the special principle of wavelength calibration of the FBG-IS was reveled on the basis of the analyzing of the operating principle. The operating software of the FBG-IS was modified by using the Labview software development terrace, and as a result, the ability of data transmission and backup remotely based on Data Socket was realized.Fifthly, taken the rectangle flat structure as study of object, the finite element academic model of flat was established, the hypostatic model of flat was presented, and the stress distribution of flat was gained. At the same time, using the fiber Bragg grating sensing network, the local strain response of rectangle flat with bearing force was monitored. As a result express that FBG could feel the contingency variety of the part strain of the rectangle flat structure nicely, and the experimental value was in accordance with the variety trend of the theoretical value basically.