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Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry

机译:减少光源亮度波动对通过傅立叶变换光谱仪获得的光谱的影响

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摘要

We present a method to reduce the impact of source brightness fluctuations (SBFs) on spectra recordedby Fourier-transform spectrometry (FTS). Interferograms are recorded without AC coupling of the detector signal (DC mode). The SBF are determined by low-pass filtering of the DC interferograms, which are then reweighted by the low-pass, smoothed signal. Atmospheric solar absorption interferograms recorded in DC mode have been processed with and without this technique, and we demonstrate its efficacy in producing more consistent retrievals of atmospheric composition. We show that the reweighting algorithm improves retrievals from interferograms subject to both gray and nongray intensity fluctuations, making the algorithm applicable to atmospheric data contaminated by significant amounts of aerosol or cloud cover.
机译:我们提出了一种方法,以减少光源亮度波动(SBFs)对通过傅立叶变换光谱(FTS)记录的光谱的影响。在没有交流耦合检测器信号的情况下(DC模式)记录干涉图。通过对DC干涉图进行低通滤波来确定SBF,然后通过低通平滑信号对其进行加权。直流模式下记录的大气太阳吸收干涉图已使用和不使用此技术进行了处理,我们证明了其在产生更一致的大气成分反演方面的功效。我们表明,重新加权算法可改善受到灰度和非灰度强度波动影响的干涉图的检索能力,从而使该算法适用于被大量气溶胶或云层污染的大气数据。

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