Brillouin Distributed Optical Sensor Control System Design

This dissertation is focus on the sensitive mechanism of the Brillouin scattering signal, with an emphasis on the design of the optical-link control system of the Brillouin scattering distributed sensing system. It belongs to the Hi-Tech R&D project of "Brillouin scattering distributed temperature sensor for submarine pipelines of long distance".Through analyzing two detecting methods of the BOTDR, we proposed the Brillouin scattering distributed sensing system based on optical interferometric detection as a fmial scheme. Then due to the powerful and flexible character of the USB micro-controller EZ-USB FX2, we selected it to make the platform of the optical-link control system. It not only satisfied the requirement to transmit sensing datas to the host at high speed, but also guaranteed to implement complex control algorithms. Using this platform, we designed two kernel modules of the optical-link control system, which are polarization-related modulation system and polarization-related interferometric detection system respectively. Some related experimental results were also presented and discussed.The principles and the ideas of the above-mentioned system, and the key points of the realization process of the blue print are discussed in detail. We also demonstrated the new technology refered by the system design, and made some innovations based on them. By testing and adjusting the system again and again, we finally realized all the functions of the optical-link control system. The results proved the feasibility of the scheme of Brillouin scattering distributed sensing system.Finally, the problems existed in the optical-link control system and some opinions of the future imprument of the system were given.