J. Eur. Opt. Society-Rapid Publ. 21, 13( 2025) 147
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. 4. Interferogram and average spectrogram of potassium lamp in dark laboratory environment.( a) Interferogram of potassium lamp;( b) Noisy spectrogram;( c) Spectrogram obtained by PCA method;( d) Spectrogram processed by PCA-NLM Method.
Fig. 5. Measured interferogram and average spectrogram under an atmospheric background environment.( a) Interferogram of the actual measurement;( b) Average spectrum of the measured interferogram after pretreatment.
Fig. 6. Average spectral diagram corresponding to the interferogram with a measuring distance of 442 cm and potassium lamp at a current magnitude of 6 mA.( a) Average spectral diagram;( b) Magnified view of the local region.