Research And Design Of Production Platform Of Fiber EFPI Sensor

Remote monitoring and on-line measurements are widely applied in various industrial applications.The performance of the sensor determines the accuracy of the equipment state information extraction.Fiber optic EFPI sensor is a hot research topic that has proved the potential to work in transformer successfully as the advantages of high sensitivity,thermo stability and electromagnetic interference immunity.In this paper,the relevant theory of the optical fiber EFPI sensor is introduced.Based on this,the corresponding parameters of the sensor are established,and the influence on the performance of the sensor is analyzed.In this paper,the mechanism of laser welding is introduced in detail.The hardware platform is built including optics system and six dimensional mobile platform.The software for the control of the instrument and the demodulation of F-P cavity length based on cross correlation function are developed and designed.The laser welding system is used to complete the hot melt welding of the membrane and the capillary tube as well as the optical fiber and the capillary tube.The control parameters of the laser were optimized by comparing the effect of the welding process.The production process is improved by using the preheating and annealing technology.In this paper,the performance of the laser welding sensor is tested by using the existing equipment in the laboratory.The stability and reliability of the optical fiber EFPI sensor fabrication platform are verified by experiments.PD in transformer oil can be detected using the fabricated sensor with high sensitivity.In addition,the influence of fluid viscous damping on the frequency of the sensor is verified in order to optimize the parameters of the sensor.In the end,the paper also makes a prospect of the following work.