The optical baseline concept of the NISP near infrared spectrometer and photometer on board of the ESA/EUCLID satellite

Grupp, F.; Prieto, E.; Geiss, N.; Bode, A.; Katterloher R.; Grange, R.; Junk, V.; Bender, R.

Proc. SPIE. 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84420X. (August 22, 2012) doi: 10.1117/12.925645

Abstract: The ESA/EUCLID satellite is equipped with two instruments that are simultaneously observing patches of > 0:5 square degree on the sky. The VIS visual light high spacial resolution imager and the NISP near infrared spectrometer and photometer are separated by a di-chroic beam splitter. This paper shows the baseline concept of the NISP instrument with its two observational modes being low resolution slit-less spectroscopy and three band J, H and K+ photometry. The drivers for the optical design, the nominal performance as well as the tolerancing approach for NISP are being presented. The impact of the tolerance approach and the tight tolerances on the opto-mechanical design, assembly, integration and verification is addressed in a special section of this paper.

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