Research On Pipeline Pressure Monitoring Sensor Based On Fiber Bragg Grating

As a common energy transportation device,it is important to monitor the health of pipelines.In some high temperature and high pressure,flammable and explosive or strong electromagnetic field interference environments,traditional sensors such as electrical sensors and magnetic sensors will be greatly limited.Compared with FBG sensors,they have the advantages of strong anti-interference ability,light weight and small size.FBG sensors are simple and compact,and their sensitivity can be significantly improved in combination with certain materials and structures,which can meet the needs of highprecision measurement in special environments.In this paper,the research status of pipeline pressure sensors is extensively investigated,and two sensors with different structures for non-destructive detection of pipeline internal pressure are prepared on the basis of existing research,and their strain sensitivity is studied.The main research contents are as follows.Firstly,on the basis of extensive research,the current situation of pipeline pressure detection at home and abroad is analyzed.The sensing mechanism of fiber grating was analyzed by analog coupling theory,the temperature and strain characteristics of fiber grating were studied,and the principle of temperature compensation was investigated.Secondly,two FBG sensors based on equal strength beam and diamond structure are designed for non-destructive testing of pipeline pressure.The influence of the parameters and materials of two different structure sensors on stress sensitivity is simulated and analyzed,and the optimal size sensor structure suitable for this paper is obtained.Finally,two sensors were prepared,an experimental protocol was designed and an experimental platform was built.Repeated experiments were carried out,and pipeline buck-boost experiments were carried out on bare grating,equal strength beam shrapnel and diamond structure,and temperature compensation experiments were also carried out on diamond structure and equal strength beam shrapnel structure.