摘要
提出了一种利用FTIR光谱仪进行大气透过率测量的方法。通过黑体对系统的光谱响应进行标定,由两点温度校准得到测量光谱的辐射亮度谱。在一定的距离内实测并分析计算出了CO2红外吸收波段的大气透过率谱。采用非线性最小二乘方法将测量的CO2透过率谱与HITRAN数据库中的光谱拟合得到了干洁大气中的CO2浓度值。实验结果表明,该方法是测量大气透过率和定量分析气体组分的可行性方法。
A method for the measuring atmospheric transmittance using ETIR spectrometer was proposed. Calibrating spectral response of system based on two-point temperature with blackbody , the transmittance spectra of CO2 IR absorption band was analyzed and calculated depending on the measurement data. The CO2 concentration in clean air was acquired after fitting the measured spectra with the line parameter in HITRAN employing NLLS method. The results show that the method is feasible for measuring atmospheric transmittance and analyzing gases in quantity.
出处
《光学技术》
EI
CAS
CSCD
北大核心
2005年第4期627-629,共3页
Optical Technique
关键词
红外辐射
傅里叶变换
两点温度校准
透过率谱
infrared radiation
Fourier transform
two-point calibration
transmittance spectra
