基于LabVIEW的透射转镜式傅里叶变换光谱分析软件设计

Software Design of Transmission Rotary Mirror Fourier Spectrometer Based on LabVIEW

为满足透射转镜式傅里叶变换红外光谱仪的数据采集、非线性拟合补偿、信号预处理和傅里叶光谱反演等测试需求,设计了一套基于LabVIEW的集数据采集和信号分析为一体的透射转镜式傅里叶光谱分析软件。该软件通过调用NI数据采集卡的物理通道接口来采集干涉信号幅度随时间变化的干涉图数据,并通过信号处理程序复原红外信号的频谱信息,可实现波形文件的自动存储和数据处理重要流程的可视化,适合在工控机上应用。测试面源黑体辐射源的辐射光谱曲线,利用聚苯乙烯的吸收光谱测试波长准确性,并利用水蒸气的光谱曲线测试光谱半高宽。采用本文设计的光谱分析软件,复原出了红外信号的光谱分布,实现了0.40%的波长准确性、0.88cm^(-1)的光谱分辨率,验证了系统的可用性。

In order to meet the requirements of data acquisition,nonlinear fitting compensation,signal preprocessing and Fourier spectrum inversion of transmission rotary mirror Fourier spectrometer,a set of transmission rotary mirror Fourier spectrum analysis software integrating data acquisition and signal analysis is designed based on LabVIEW.By calling the physical channel interface of NI data acquisition card,the software collects the interferogram data of the amplitude of interference signal changing with time,and restores the spectrum information of infrared signal by signal processing program.It can realize automatic storage of waveform files and visualization of important data processing processes,which is suitable for industrial computer applications.The spectral curve of blackbody radiation source is measured.The wavelength accuracy is measured by polystyrene absorption spectrum,and the spectral half-height width is measured by water vapor spectrum curve.By using the spectral analysis software designed in this paper,the spectral distribution of infrared signal is recovered.The wavelength accuracy of 0.40% and the spectral resolution of 0.88 cm^(-1) are achieved,which verifies the usability of the system.