We present the results of a detailed analysis of the noise behaviour of two CCD spectrometers in common use, an AvaSpec-3648 CCD UV spectrometer and an Ocean Optics S2000 Vis spectrometer. Light sources used include a deuterium UV / Vis lamp and a UV LED including newly developed UV LEDs. Common noise phenomena include source fluctuation noise, photo-response non-uniformity (PRNU), dark current noise, fixed pattern noise (FPN) and read noise. These were identified and characterised by varying

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... ght source, spectrometer settings or temperature. A number of noise limiting techniques are proposed, demonstrating a best case spectroscopic noise equivalent absorbance (NEA) of 3.5×10 -4 AU for the AvaSpec-3648 and 5.6×10 -4 AU for the Ocean Optics S2000 both over a 30s integration period. These techniques can be used on other CCD spectrometers to optimise performance. , "Noise analysis for CCD-based ultraviolet and visible spectrophotometry," Appl. Opt. 54, 8135-8144 (2015)