基于拉曼散射的分布式光纖溫度傳感器研究
[Abstract]:Distributed optical fiber temperature sensing technology is used to measure the temperature field of optical fiber by backward reflected Raman scattering light. Distributed optical fiber temperature sensor is widely used in medical treatment because of its small size, anti-interference, good precision and so on. Industry, national defense and many other fields. In this paper, the distributed optical fiber temperature sensor is designed and developed. The main work is as follows: (1) the single channel demodulation algorithm and the double channel demodulation algorithm in Raman scattering are compared. The advantages and disadvantages of the two algorithms are analyzed. Furthermore, the system is designed by dual-channel demodulation algorithm, and the data sampling experiment is carried out. (2) the design and selection of key devices such as processor, AD and other key devices in distributed optical fiber temperature sensor are studied. The processor of the distributed optical fiber temperature sensing system adopts the FPGA DSP ARM mode. On the one hand, the traditional PC FPGA mode has the characteristics of simple module and easy development, but it also makes the power consumption and volume of the whole system become larger. On the other hand, the mode of, FPGA DSP ARM can make full use of the advantages of each processor: FPGA has the characteristic of hardware programmable, it is suitable for high speed logic operation, DSP is suitable for mathematical operation, and ARM is suitable for interface design, so the whole system achieves low energy consumption. Fast speed, small size characteristics. In addition, single channel time-sharing multiplexing is adopted in AD components, which reduces the design cost of the whole system. (3) A new high speed PCB is designed in distributed optical fiber temperature sensor system. Specific work includes: analog circuit design, AD circuit design, PCB overall layout. In the design work, the integrity of the analog signal and the high speed signal are fully considered, which provides a good guarantee for the subsequent Raman signal acquisition. (4) the software design of the distributed optical fiber temperature sensor is carried out. On the one hand, on the FPGA platform, a high-speed accumulator is designed using Verilog to improve the signal to noise ratio of Raman signal. On the other hand, on the DSP platform, the temperature demodulation algorithm under Sys/bios and the synchronization control between DSP and FPGA are realized. On the platform of ARM, the design of SQL database, human-computer interface under QT and dual-core communication based on Syslink are carried out by making full use of the mature technology in embedded field.
【學位授予單位】:華北電力大學(北京)
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TP212
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