基于高速数字BOXCAR的布里渊DOFS数据处理系统的实现

【作者】 范胜利；

【导师】 宋牟平；

【作者基本信息】 浙江大学 ， 物理电子学， 2004， 硕士

【摘要】 本论文分析了分布式光纤传感器的原理和信号检测原理，实现了布里渊散射DOFS的信号处理系统，给出了试验结果。本论文是国家863项目“长距离海底管道分布式光纤传感技术”工作的一部分。 论文在介绍光纤传感器的特点及分布式光纤传感器的原理和发展的基础上，通过分析被检测的光纤布里渊后向散射信号的特点，比较了微弱信号检测的各种方法，最终选择了多点数字信号平均(数字BOXCAR)的处理方案，实现了基于高速数字BOXCAR的布里渊DOFS数据处理系统。具体设计了由硬件电路和相应检测软件组成的数据处理系统，该系统由AD采样芯片、FPGA(Field Programmable Gate Array，现场可编程门阵列)芯片和USB2.0协议控制芯片组成，并实现了各功能模块电路(主要是基于FPGA)，包括高速AD采集、数字叠加、高速存储、数据传送、计算机接口等，以及对采集到的数据进行相应处理的系统处理软件，最终得到有用的温度和应变信息。 本论文对于系统设计的思想和具体实现过程中的关键技术细节进行了详细的介绍，对于所使用的新技术进行了具体的说明，并论述实际应用中各种可能出现的问题和有效解决方法。通过反复的试验与调整，我们已经实现了数字BOXCAR的数据AD转换、高速采集、基本叠加、存储和数据传送，以及可以通过数据处理提取有用的温度和应变信息的功能。在实际实验中，能够完成以上功能。 在论文最后总结了本系统的缺点和实现难点，并提出了一些将来改进的设想。更多还原

【Abstract】 This dissertation is focus on the basis of domestic techniques of distributed fiber-optical, the methods and approaches of signal detection and processing in distributed fiber-optical sensor system and the realization of the signal processing system. And for the distributed fiber-optical sensor based on Brillouin scattering, we gave the result of the experiment.A digital multi-point average method (Digital BOXCAR) has been proposed based on the characteristics and the sorts of fiber-optical sensors and by analysis the feature of the Brillouin-scattering signal, and also comparisons of all sorts of Weak-Signal Detection theory, and a signal processing system of Brillouin DOFS based on High Speed Digital Boxcar, which is made up of the High-speed AD, FPGA chip, the USB protocol controller chip and software was realized. We designed the High-speed Sampling, Digital Adding, High-speed Storage, Data Transmission and interface circuits of PC successfully. The software is designed to gather the temperature and stress information by what we get from the Hardware circuit.The principles of system design and key points of the realization process of the blue print are discussed. We also show the new technology details of the system design and all the problems which ones may encounter and the effective solving methods. By testing and adjusting the system again and again, we have the basic functions such as Adding, Storage, Transmission of the Data of Digital BOXCAR, and getting temperature and stress information by analyzing the original data. The results proved the validity of the scheme of the system design.Finally, the problems and the difficulties of experimental system and some opinions on the future development of the system is given.更多还原