基于dsp的弹光调制非均匀干涉信号获取及反演算法分析word格式论文.docxVIP

Research for Acquisition and Spectrum Recovery Algorithm of Photoelastic Modulator Nonuniform Interference Data Based on DSPAbstractFourier Transform Infrared Spectrometer(FTIR) is widely used in the Infrared remote sensing, nuclear magnetic resonance (NMR), space exploration, and many other fields due to its unique fast scanning speed, high sensitivity, wide spectrum range, good shock resistance and a lot of advantages. The photoelastic modulator interferometer is the key part of the FTIR spectrum analyzer. It is a new type of static scan system, and it overcomes the early many drawbacks of Fourier transform spectrometer.The paper bases on the analysis of the difference between FTIR and ordinary spectrometer, and then with the requirements of the project, the relevant situation and technology all over the world, it studies interference data difficult to be achieved by phase sampling in the photoelastic modulator because of the characteristic of the refractive index with sinusoidal modulation, and then studies the non-phase (or time interval sampling) spectral inversion algorithm, namely nonuniform fast Fourier transform algorithm(NUFFT). Finally the spectrum data is real-time processed and spectrum information is recovered using advanced DSP+FPGA technology with NUFFT algorithm on the hardware DSP.Finally, the tests are carried on the basis of the theory verification and laboratory conditions, different wavelength lasers(632.8 nm 、652.6 nm 、671.1 nm ) is used in order to getspectrum, and then the spectrum information is recovered. The experiment results show that nonuniform fast Fourier transform algorithm can completely recover the spectrum information for the interference data of monochromatic light and polychromatic light, the recovery accuracy and recovery rate meet the requirements of the project.Key words: Photoelastic Modulator , Nonuniform Interference Data, DSP, NUFFT目录1 绪论1.1 课题的选题背景、目的和意义 11.2 课题的国内外研究现状及相关技术 11.2.1 傅里叶变换光谱仪的发展 11.2.2 弹光调制傅里叶变换光谱仪的国内外研