Design Of Dynamic Demodulation System For Optical Fiber Fabry-perot High Temperature Pressure Sensor

Nowadays,pressure measurement in high temperature environment has a wide range of needs.With characteristics of simple structure,high sensitivity,anti-electromagnetic interference,resistance to harsh environment,optical fiber Fabry-Perot high-temperature pressure sensors have more advantages in high temperature pressure measurement.With development of high temperature optical fiber Fabry-Perot pressure sensors in recent years,optical fiber Fabry-Perot high temperature sensors demodulation technology is also development in constant,but the current demodulation systems lack dynamic demodulation ability generally.Therefore,in order to meet the needs in testing and engineering applications,a novel dynamic demodulation method of optical fiber Fabry-Perot sensor is required.Based on the literature at home and abroad,this paper researched the wide demodulation methods in recent years and analyzed the advantages and disadvantages of these methods.Through the research on the sensing mechanism of optical fiber Fabry-Perot high temperature pressure sensor,a new type of optical fiber Fabry-Perot dynamic demodulation algorithm has been designed.On the basis of mathematical simulation,the advantages and disadvantages of this algorithm are analyzed,and the generation of the error is researched.The results show that the relative error of the algorithm is within 0.2%,and the feasibility of the algorithm in practical application is verified.Then using FPGA development board,this algorithm is implemented on the hardware,and the demodulation speed is up to 2.88 kHz.The optimization measures are also proposed in this paper,which is expected to increase the system's demodulation speed to a higher speed in the future.Select the appropriate optical equipment and electronic components,the optical system and the hardware circuit are designed.To build a optical fiber Fabry-Perot high-temperature pressure sensor test platform,the test of two optical orthogonal signal algorithm principle is completed.The results show that the new demodulation method is feasible.In the field of optical fiber Fabry-Perot high temperature pressure sensor demodulation,a novel method of dynamic demodulation is proposed.Finally,this paper lays a preliminary research foundation for this new demodulation method.