基于FPGA快速光谱获取与分析系统的研究

Research on fast spectrum acquisition and analysis system based on FPGA

为了高速地从空域信息中提取频域信息,研究设计基于FPGA的快速光谱获取与分析系统,其光学模块包括准直透镜、静态干涉棱镜、CMOS等,数据采集与处理采用FPGA硬件编程实现。通过对CMOS采集得到的干涉条纹进行滤波切趾、FFT以及光谱标定等处理,给出了相关的计算公式,实现了被测光光谱分布的复现。采用Moswlaim 6.3f对系统的各个模块进行仿真分析,计算不同切趾方式对光谱反演结果的影响,分析了FFT的时序逻辑关系。在搭建了该系统光学模块与处理模块的基础上,完成对660 nm激光器的光谱分析。结果显示,该系统可以实现光谱分布数据的复现,并且转换速度高,适用于高速数据处理系统。

To realize the purpose of extracting the frequency domain information from the airspace information at high speed,a fast spectrum acquisition and analysis system based on FPGA is designed and studied. Its optical module includes collimator lens,static interference prism,CMOS and so on. Data acquisition and processing were realized by FPGA hardware programming. Processes such as filtering,apodization,FFT,and spectral calibration are performed for interference fringes obtained from CMOS acquisition. Related calculation formulas are given,and the spectra distribution recurrence of the measured light is realized. Simulation analysis for each module of the system are performed by using the Moswlaim 6.3 f software,the effect of different apodization patterns on spectral inversion results is calculated,and the temporal logic relationship of the FFT is analyzed.On the basis of establishing the optical module and processing module of the system,the spectral analysis of the 660 nm laser was accomplished. The results show that the system can achieve the recurrence of spectrum distribution data,and hasa high conversion speed,which is applicable for the high-speed data processing system.