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In optical measurement of atmospheric compositions using differential absorption technologies, traditional moving window average does not match the broadband background well, and will generate large measurement errors. To overcome the said drawbacks of moving window average, Savitzky-Golay filter is used in this paper. The principles of moving window average and Savitzky-Golay filter are introduced...
To suppress the dark current of spectrometer which is one of the main factors that limit the detection limit in the optical measurement of atmospheric compositions based on differential absorption technologies, in this paper, the effect of dark current on the gas retrieval procedure is analyzed, the dependency of dark current on temperature and integration time is tested, and two steps to suppress...
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