THE DESIGN AND DEVELOPMENT OF A TUNABLE AND PORTABLE RADIATION SOURCE FOR IN SITU SPECTROMETER CHARACTERISATION

摘要

For spectrometers the characterisation of their wavelength scale and spectral bandwidth underpins the quality of their measured data. This characterisation can be performed using metrology-grade tuneable monochromatic sources, which are currently available only in a few laboratories world-wide. Yet in numerous applications only the in-field calibration is a feasible solution. We have designed and developed a Tuneable and Portable radiation Source (TuPS) in the wavelength range from 300 nm to 350 nm for the in-field characterization of Dobson and Brewer spectrometers wavelength scale and slit-function with uncertainties better than 0.02 nm in wavelength with emitted radiation bandwidth smaller than 0,1 nm. The TuPS is designed such that only minor modification of its optical system extends/shifts its spectral range towards visible and near-infrared spectral regions and thus expand its application for spectral characterisation of any spectrometers in the relevant spectral region of interest.