This paper covers the description and main results of the setup and characterization of IR and VIS-NIR light sources for the MAJIS instrument of the JUICE mission. The setups were a challenge as it involved the need of optical characterization of the emitters in vacuum at very low temperature.
MAJIS (Moons And Jupiter Imaging Spectrometer) is the VIS-IR imaging spectrometer of the ESA/JUICE mission that will explore the Jovian system. It covers the spectral range 0.5 to 2.35 μm and 2.26 to 5.56 μm using two channels. The MAJIS Optical Head (OH) consists in a TMA telescope shared between the two channels, as well as a slit and collimator, then a dichroic filter that splits the light between the channels, each one being equipped with its own grating and focusing lens. The same type of detector is used for both spectrometers (apart from the order sorting filter), being a 400 pixels × 508 spectels with 36 µm pitch. We will present the characterization of the OH performed at Leonardo Company at cold operational temperatures (from 110K to 150K). The test set-up with a specific emphasis of the Optical Ground Support Equipment (OGSE) used during that characterization campaign will be shortly described. Then, the main performances (spatial, spectral) of the OH will be presented and a comparison with the requirements will be provided.
This paper reports the design, assembly and calibration activities relative to the internal calibration unit mounted on the Visible and Infrared Hyperspectral Imager (VIHI). VIHI is one of the three optical channels of the SIMBIO-SYS suite (Spectrometers and Imagers for MPO BepiColombo Integrated Observatory SYStem), one of the payload instruments onboard the probe BepiColombo/MPO, the ESA cornestone mission to be launched in 2016-2017 to Mercury. The activities reported include also the qualification tests of the commercial sources (a Welch-Allyn 1163 incandescence lamp and the NICHIA NJSW036BLT LED) selected. All the qualifications (Thermal, Vibration and Radiation tests) were successful, demonstrating the suitability of the commercial sources as Flight hardware. The performances of the ICU were verified during its mounting and alignment in the VIHI optical bench. The ICU satisfy the requirements of providing a spectral radiance of the same order of magnitude of the signal from Mercury and of guaranteeing a good degree of spatial uniformity across the spectrometer slit for the verification of the flat field in flight. The LED source provide an uniformity of the order of 10%, while the lamp signal drops by about 30% at the extreme edges of the FOV.
An evaluation model of a high precision mirror drive, based on the parallelogram principle, has been designed and manufactured at Officine Galileo so as to meet the instrumental requirements of the high resolution Fourier Transform Spectrometer (FTS for the Spectroscopy of the Atmosphere using Far InfraRed Emission (SAFIRE) project. Mechanical and optical tests, carried out on the scanning mechanism evaluation model, provided measurements of the stability and uniformity of the movement and showed that the selected mirror drive concept meets the required tolerances.
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