Based On FPGA Of The Distributed Raman Fiber Temperature Measuring Control System

Distributed Optic Fiber Temperature Measurement System which is a technique for measuring the temperature field in space. Because of it has the characteristics of real time and multi points, so it is developing rapidly in recent years. This technology not only has a large measurement range and the measurement distance can be adjusted according to the actual, but also because of the physical properties of the optic fiber has anti-interference, corrosion resistance and so on, so it has excellent stability. Because this technology has a series if excellent characteristics and advantages, the distributed optic fiber temperature measurement has got great development at home and abroad in these years. The technology has vast application foreground in many professions, for example:Industrial Control, Power Transmission, Defense Industry, etc.The paper discusses the distributed optical fiber temperature sensing system based on Raman scattering effect. This paper mainly discusses the data acquisition, data processing and the data analysis of the Raman distributed optical fiber temperature system. Finally, because of, we already have a photoelectric conversion device, so decide use FPGA (field programmable gate array) built the acquisition and processing system. According analysis of the actual need, we choice the analog digital conversion chip, design and make PCB. After the actual programming achieve such as photoelectric conversion signal acquisition, the acquisition of the signal to noise reduction processing, data transmission and so on in the FPGA. Because we want the system could use in the field of embedded considerations, we choose to use the ARM processor, and use programming software Qt to write embedded Linux software.At the end of this paper, we tested the data acquisition and control system. When after the hardware test, we analyze and verify every module working status of the signal acquisition and processing program. Finally, the result show that this system meets the design requirement.