Euclid Near Infrared Spectrometer and Photometer instrument flight model presentation, performance and ground calibration results summary

TL;DR

This paper details the design, performance, and ground calibration results of the NISP instrument for the Euclid mission, which operates in the near-infrared spectrum as a spectrometer and photometer.

Contribution

It presents the final architecture and calibration results of the Euclid NISP instrument, highlighting its components and performance at operational cold temperatures.

Findings

Successful ground calibration measurements at operational temperature

Validation of the instrument's architecture and subsystems

Performance metrics confirming readiness for space deployment

Abstract

The NISP (Near Infrared Spectrometer and Photometer) is one of the two Euclid instruments. It operates in the near-IR spectral region (950-2020nm) as a photometer and spectrometer. The instrument is composed of: a cold (135 K) optomechanical subsystem consisting of a Silicon carbide structure, an optical assembly, a filter wheel mechanism, a grism wheel mechanism, a calibration unit, and a thermal control system, a detection system based on a mosaic of 16 H2RG with their front-end readout electronic, and a warm electronic system (290 K) composed of a data processing / detector control unit and of an instrument control unit that interfaces with the spacecraft via a 1553 bus for command and control and via Spacewire links for science data. This paper presents: the final architecture of the flight model instrument and subsystems, and the performance and the ground calibration measurement done at NISP level and at Euclid Payload Module level at operational cold temperature.