Software Design Of Distributed Fiber Optic Sensor System

Distributed fiber optic sensors have been used in many fields due to its advantages such as low-cost,high-precision,anti-corrosion,long distance sensing,etc.Based on Brillouin scattering theory and using embedded devices as hardware development platform,a software system is designed for distributed optical fiber sensors.Compared with the traditional optical fiber sensing system,the distributed optical fiber sensor system based on Brillouin scattering can detect the temperature and strain information of the tested environment.Meanwhile,the sensing system based on embedded platform has advantages as low-cost,high performance and high stability etc.The Client/Server architecture is adopted in our design and the thesis is focusing on the server-side software system.Based on embedded platform,the software is used to control the completion of the original data acquisition,process the data and transmit the sensor information to the client.OMAPL138 is taken as the master chip,in which the DSP core is responsible for controlling and receiving the raw data collected and cached by the FPGA,and performing high-speed calculation and analysis on the original data.The embedded Linux system on the ARM core runs the main program to coordinate the DSPLINK module,data processing and packaging module,network communication module,etc.The master program manages the control of the entire sensor system and is responsible for communicating with the client system.Finally,the data acquisition,data processing flow and embedded system are tested in the distributed optical fiber sensing system.The results show that the software system meets the expected requirements.In addition,in order to improve the performance of distributed optical fiber sensing system based on Brillouin scattering,the impact of probe power on the distortions of both pump pulse and Brillouin gain/loss spectrum in single-tone probe based BOTDA system is experimentally investigated.