Denoising analysis of compact CCD-based spectrometer

CCD spectrometers are widely used in many fields for quick and accurate measurement of spectra. This paper firstly analyzes various noise phenomena by using Ocean Optics USB4000 spectrometer, including readout noise, photoelectron noise, dark noise and fixed pattern noise. Secondly, noise models of CCD-based spectrometers are built based on the theoretical analysis of noise phenomena. A number of noise-limiting techniques are applied to broadband spectra and line spectra with different noise levels. Lastly by comparing the denoising results, the optimal denoising algorithms are proposed for different spectral characteristics and noise levels.