基于DSP的光谱仪数据传输及信息分析研究

发布时间：2018-06-09 13:47

本文选题：光谱仪 + DSP　；参考：《南京理工大学》2016年硕士论文

【摘要】：直读光谱仪是工业生产中一种重要的分析检测仪器,具有分析速度快,检测精度高等优点。传统光谱仪体积笨重,检测条件要求严苛,难以适应现代生产的新要求。本文以DSP和CCD为基础,研究并设计直读光谱仪检测系统及信息处理系统,实现光谱仪的轻便化、小型化,这对提高光谱仪技术及扩展光谱仪使用范围有着重大意义。本文分析并研究了原子光谱理论和衍射理论,计算了几种元素特征光谱位置,利用凹面光栅作为色散系统搭建了基于DSP和CCD的光谱仪系统,为提高实验结果的精度,采用了高压火花光源和氩气冲洗装置。利用CCS编写了DSP传输数据和处理数据软件,实现了DSP快速读取FPGA中光谱数据的EMIF接口,经测试数据传输高速、有效；设计了任务函数,对光谱图像进行降噪处理并对不同光谱图像定标定量；设计了DSP与上位机网络接口,结果表明网络畅通、可靠。深入研究了元素光谱的特征谱线,根据不同元素特征谱线的分布位置拍摄了多张光谱图,探讨了样品在激发过程中遇到的激发不均和激发不稳定对结果的影响。以Cr和Al为例,详细说明了元素特征谱线的定标过程；采用内标法对元素进行定量分析,并对不同浓度的元素特征谱线强度进行拟合,拟合结果说明文中提出的方案有效。
[Abstract]:Direct reading spectrometer is an important analytical instrument in industrial production, which has the advantages of fast analysis speed and high detection precision. The traditional spectrometer is bulky and difficult to meet the new requirements of modern production. Based on DSP and CCD, this paper studies and designs the detection system and information processing system of direct reading spectrometer, which realizes the miniaturization and portability of spectrometer, which is of great significance to improve the technology of spectrometer and expand the scope of use of spectrometer. In this paper, the atomic spectrum theory and diffraction theory are analyzed and studied, and the characteristic spectral positions of several elements are calculated. The spectrometer system based on DSP and CCD is built by using concave grating as dispersion system, in order to improve the accuracy of experimental results. High pressure spark light source and argon flushing device are used. The EMIF interface of DSP for fast reading spectrum data in FPGA is realized by using CCS to program DSP data transmission and processing software. The test data transmission is high speed and effective, and the task function is designed. The noise reduction and calibration of different spectral images are carried out, and the interface between DSP and host computer network is designed. The results show that the network is smooth and reliable. In this paper, the characteristic spectral lines of element spectra are studied in depth. According to the distribution of characteristic spectral lines of different elements, a number of spectra are taken, and the influence of excitation imbalance and excitation instability on the results is discussed. Taking Cr and Al as examples, the calibration process of characteristic spectral lines of elements is explained in detail, and the quantitative analysis of elements is carried out by internal standard method, and the intensity of characteristic lines of elements with different concentrations is fitted. The fitting results show that the scheme proposed in this paper is effective.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH744.1

【相似文献】