弹光调制干涉信号的高速数据处理系统设计与实现

发布时间：2018-07-10 03:11

本文选题：弹光调制器 + FPGA　；参考：《中北大学》2015年硕士论文

【摘要】：弹光调制傅里叶变换光谱仪是一种新型光谱仪，采用弹光调制干涉具替代傅里叶变换光谱仪中机械扫描或空间扫描干涉具的结构，具有速度快、灵敏度高、光谱范围宽及抗震性高等优点，，在科学研究、国防建设、安全生产以及环境保护等方面有着广泛的应用前景。其核心部件弹光调制干涉具由弹光调制器和驱动器组成，而弹光调制器调制频率高，且调制后的光程差呈非线性。为了实现干涉图的实时采集存储和处理，对弹光调制干涉信号数据处理系统的研究非常有必要。论文首先对弹光调制干涉信号的高速数据处理系统进行了研究，并在本课题组现有可以满足弹光调制干涉信号处理系统的基础上，如FPGA+PCIe+Matlab的处理系统、NI采集箱等，提出了基于FPGA+DSP+LCD高速数据处理系统的设计方案，进一步提高了整体系统的灵活性和集成度；数据处理部分采用多处理器架构，外部寄存器的初始化和数据的还原、格式转变等简单处理由FPGA和其内部的软核处理器协同完成，光谱复原等复杂算法在DSP内完成。其次，根据系统预期的性能指标，完成了重要芯片的选型；设计了采样模块、时钟分配模块、存储模块、LCD显示模块、DSP外围电路和FPGA外围电路的原理图，并根据高速PCB的设计规则，完成了整个系统的板级设计；在FPGA内部搭建MicroBlaze软核处理器，定制各外设IP核，并通过在线逻辑分析仪ChipScope和Matlab对各模块电路进行了调试与分析。最后，搭建了弹光调制傅里叶变换光谱仪测试平台，在驱动电压为950V的情况下，以632.8nm激光为入射光源，对该高速数据处理系统进行了采集存储及显示测试，结果表明，该高速数据处理系统工作稳定，且满足整体系统的要求。
[Abstract]:Elasto-Optical Modulation Fourier transform Spectrometer is a new type of spectrometer. Elasto-optic modulation interferometer is used to replace the structure of mechanical or spatial scanning interferometer in Fourier transform spectrometer, which has high speed and high sensitivity. Because of its wide spectrum range and high seismic resistance, it has wide application prospects in scientific research, national defense construction, safety production and environmental protection. The Elasto-Optical Interferometer is composed of an elastic-optical modulator and a driver. The Elasto-Optical Modulator has a high modulation frequency and a nonlinear optical path difference. In order to realize the real-time acquisition, storage and processing of interferogram, it is necessary to study the data processing system of Elasto-Optic Modulation interference signal. Firstly, the high speed data processing system of Elasto-Optical Modulation interference signal is studied, and on the basis of the existing EOMI signal processing system in our group, such as FPGA PCIe Matlab processing system and NI acquisition box, etc. The design of high speed data processing system based on FPGA DSP LCD is proposed, which further improves the flexibility and integration of the whole system. Simple processing such as format conversion is accomplished by FPGA and its internal soft core processor, and complex algorithms such as spectral recovery are implemented in DSP. Secondly, according to the expected performance index of the system, the selection of important chips is completed, and the schematic diagram of sampling module, clock distributing module, storage module, LCD display module, DSP peripheral circuit and FPGA peripheral circuit are designed. According to the design rules of high speed PCB, the board level design of the whole system is completed, the microBlaze soft core processor is built in FPGA, the IP cores are customized, and the circuits of each module are debugged and analyzed through the on-line logic analyzer ChipScope and Matlab. Finally, a testing platform of elastic-optical modulation Fourier transform spectrometer is built. With the driving voltage of 950V and 632.8nm laser as the incident light source, the high-speed data processing system is collected, stored and displayed. The results show that, The high-speed data processing system works stably and meets the requirements of the whole system.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN761

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