同步辐射红外光束线降噪技术研究

Correction Data Acquisition System (CDAS) is presented in this project. CDAS and FTIR spectrometer of the IR beamline station are used in synchronization. CDAS is used to collect the data of the energy and the fluctuation of the Synchrotron Radiation IR Source (SRIRS). This data is used to correct interferogram data acquired by the FTIR spectrometer. In order to reduce or even remove spectral noise caused by the synchrotron radiation source fluctuation, increase the signal to noise ratio of the IR beamline station by one to two order of magnitude. This system can eliminate the adverse effects of the High-resolution spectroscopic measurement induced by the current fluctuation of the storage ring. The noise spectrum of the SRIRS can be obtained, which can be used as a powerful tool to analyze the source noise. The range of applications of IR beamline station can be extended by this project carried out. In the final, this device will be open to users. This project will provide users with an ultra-stable experimental environment.

本项目使用矫正数据采集系统，与同步辐射红外光束线站所用FTIR光谱仪同步探测同步辐射红外光源的能量和能量波动信号，以此作为矫正数据，修正FTIR光谱仪所采干涉图数据，降低甚至去除由同步辐射红外光源能量波动所引入的噪声。该项目可将光束线站系统的信噪比在现有的基础上提高1～2个量级，并且可以消除储存环中束流的起伏对高分辨率光谱测量带来的不利影响。项目在降低噪声的同时，可以得到同步辐射光源噪声的噪声谱，该噪声谱可作为分析同步辐射红外光源噪声来源的有力工具。本项目的开展可以扩展同步辐射红外光束线站在高光谱分辨率下的应用范围。该项目完成后将向用户开放，可为用户提供一个超稳定的红外光谱检测的实验环境。

本项目设计和实现了一套矫正数据采集系统，其可与同步辐射红外光束线站所用傅立叶变换红外（FTIR）光谱仪同步探测同步辐射红外光源的能量和能量波动信号，以此作为矫正数据，修正FTIR光谱仪所采干涉图数据，降低甚至去除由同步辐射红外光源能量波动所引入的噪声。降低储存环中束流的起伏对高分辨率光谱测量带来的不利影响；本项目设计了一套区域中值滤波算法，可自动消减储存环工作在恒流注束时引入的噪声。项目在降低噪声的同时，可以得到同步辐射光源噪声的噪声谱，该噪声谱可作为分析同步辐射红外光源噪声来源的有力工具。本项目的结果可以扩展同步辐射红外光束线站在高光谱分辨率下的应用范围。