Bowman K W, Worden H M, Beer R
Appl Opt. 2000 Jul 20;39(21):3765-73. doi: 10.1364/ao.39.003765.
Spectra measured by off-axis detectors in a high-resolution Fourier-transform spectrometer are characterized by frequency scaling, asymmetry and broadening of their line shape, and self-apodization in the corresponding interferogram. For a narrow-band input spectrum and a specified detector geometry, a formalism is presented that accounts for these effects with separate terms. Some of the terms are used to correct the larger off-axis effects as part of the calibration. The remaining terms are used to model the residual effects with the on-axis instrument line shape. We extend this approach to the broadband case using filter banks. The technique is applied to simulated spectra for the Tropospheric Emissions Spectrometer. This approach is shown to maintain a radiometric accuracy to less than 0.1%.
在高分辨率傅里叶变换光谱仪中，由离轴探测器测量的光谱具有频率缩放、线形不对称和展宽以及相应干涉图中的自变迹等特征。对于窄带输入光谱和特定的探测器几何结构，提出了一种形式主义，用单独的项来解释这些效应。其中一些项用于在校准过程中校正较大的离轴效应。其余的项用于用轴上仪器线形对残余效应进行建模。我们使用滤波器组将这种方法扩展到宽带情况。该技术应用于对流层发射光谱仪的模拟光谱。结果表明，这种方法能将辐射测量精度保持在小于0.1%。
