Pre-launch optical verification of the Euclid NISP instrument and comparison with simulated images
December 02, 2022
To characterise the NISP (Near-Infrared Spectrometer and Photometer) instrument optical capability before the launch of the Euclid telescope to orbit, foreseen in 2023, data analysis of
ground-based tests and Monte Carlo simulations that mimic the expected NISP performance were carried out. Pre-launch test datawere analysed to assess the fulfilment of the mission specifications in terms of Point Spread Function (PSF), set at EE50(PSF) ≤ 0′.′3, and with a spectral resolution below 16Åpx−1. We also provide a first comparison between real images from the ground-based tests with simulated ones. We confirm the high optical quality of the NISP instrument, fulfilling the mission specifications in terms of PSF and spectral dispersion with a good agreement between the different test campaigns. We validated the PSF and spectral dispersion provided by the NISP simulator, a crucial aspect to validate the consistency between real and simulated images.
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