Characterization facility for the MAJIS/JUICE VIS-NIR FM and SM detectors

Bolsée, David; Laeken, Lionel Van; Cisneros-González, Miriam E.; Pereira, Nuno; Depiesse, C.; Jacobs, Lars; Vandaele, Ann Carine; Ritter, Birgit; Gissot, S.; Karatekin, Özgür; Poulet, F.; Langevin, Y.; Dumesnil, C.; Dubois, Jean‐Pierre; Arondel, Antoine; Haffoud, Paolo; Ketchazo, Christian; Hervier, V.

doi:10.1117/12.2576319

Cited by 1 publication

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“…About four more hours are needed to stabilize the temperature of the copper plate to its target temperature, with a maximum rate of −0.9 K∕ min. 34 The temperature rate of the warming-up process is defined by the capabilities of the vacuum system to pump out the outgassing of materials and by the rate at which the detector can be exposed. For instance, the temperature changes for the MAJIS VIS-NIR detectors could not exceed 5 K∕ min.…”

Section: Cryogenic Systemmentioning

confidence: 99%

“…36 To avoid molecular contamination on the detector during the warming-up process, the coldest item must never be the detector itself. So depending on the temperature evolution of the mount and the vacuum level of the chamber, the cryocooler could be deactivated when the detector is above 200 K. 34 Once every item of the mount is at room temperature, the vacuum system can be stopped and the venting process can be performed.…”

Section: Cryogenic Systemmentioning

confidence: 99%

“…37 Since no significant spectral dependence was observed during the performed measurements (∼2%), no spectral dependence is considered for radiance analysis during characterization campaigns. 34 The final inhomogeneity matrix of the IS (Fig. 10) is constituted by the average of the matrix as measured in the WP, generated by the output illumination of the IS for each wavelength, and normalized to one at the orthogonal intersection centered on the viewport.…”

Section: Optical Systemmentioning

confidence: 99%

“…The pumping equipment consists of a dry primary pump with a pumping speed of 4 L/s, in serial connection with a turbo-molecular pump with 260 L/s of pumping speed that can automatically be activated when a level of 10−1 mbar is achieved inside the chamber. A vacuum level of 10−5 mbar is achieved in 80 min, with an ultimate vacuum level of 10−7 mbar 34 . An electro-pneumatic valve can isolate the vacuum chamber from the pumping system if needed.…”

Section: Vis-nir Characterization Facility At Bira-iasbmentioning

confidence: 99%

“…Schematic diagram of the vacuum system of the VIS-NIR facility. The detector to be characterized would be mounted in front of the CaF2 viewport inside the vacuum chamber 34 …”

Section: Vis-nir Characterization Facility At Bira-iasbmentioning

confidence: 99%

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Facility for the radiometric characterization of space-based visible-near infrared detectors

Cisneros-González,

Bolsée,

Pereira

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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When developing new astronomical instruments, there is a need to perform the characterization of their individual components, especially the detectors, to ensure that their performances comply with the scientific objectives of the instrument. A visiblenear infrared (VIS-NIR) facility was developed for the absolute and relative radiometric characterization of space-based detectors at the Royal Belgian Institute for Space Aeronomy (BIRA-IASB). The facility operates from 0.4 to 2.65 μm in an ISO-5 environment. It offers a tunable monochromatic flux with a high level of straylight rejection (10 −8 ) and 2% uniformity, over a four-decade range of intensity with adjustable bandwidth. Latency measurements are also possible. Thermalization is offered within a precision of 7 mK between 50 K and 382 K. The ultimate vacuum level of the detector chamber is below 10 −6 mbar. A robust security system avoids both reaching temperatures outside the operational range of the detector and its electronics, and contamination due to vacuum loss. The facility was already used to characterize the VIS-NIR detectors of the Moons And Jupiter Imaging Spectrometer (MAJIS), one of the instruments on board the Jupiter ICy Moons Explorer (JUICE). The versatility provided by the VIS-NIR facility allows its use for the characterization of other astronomical detectors.

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Section: Cryogenic Systemmentioning

confidence: 99%

Section: Cryogenic Systemmentioning

confidence: 99%

Section: Optical Systemmentioning

confidence: 99%

Section: Vis-nir Characterization Facility At Bira-iasbmentioning

confidence: 99%

“…Schematic diagram of the vacuum system of the VIS-NIR facility. The detector to be characterized would be mounted in front of the CaF2 viewport inside the vacuum chamber 34 …”

Section: Vis-nir Characterization Facility At Bira-iasbmentioning

confidence: 99%

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