(CAB) Comunicaciones de Congresos
URI permanente para esta colecciónhttps://inta.metricsalad.com/handle/123456789/43
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Examinando (CAB) Comunicaciones de Congresos por Autor "Evers, J."
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Ítem Restringido A far infrared spectrometer for SPICA mission: optical E2E of SAFARI(SPIE Digital Library, 2020-12-13) Fernández, María Manuela; Arrazola Pérez, D.; Jellema, W.; González, L. M.; García, R.; Belenguer, T.; Torres Redondo, J.; Restrepo, R.; Eggens, M.; Evers, J.; Dieleman, P.; Agencia Estatal de Investigación (AEI)This paper describes the end-to-end opto-mechanical design of the SAFARI instrument on SPICA and the analysis of the spectrometer optical performances. SAFARI instrument is a high sensitivity grating-based spectrometer operating in the 34-230 μm wavelength range. The scientific drivers lead to the implementation of two modes of operation. The Low- Resolution (LR) or nominal mode (R~300) and the High-Resolution (HR), that implies to include a Martin-Puplett Fourier Transform Spectrometer (MP-FTS) to achieve the required spectral resolution (R~2000-11000). The optical system is all-reflective and consists of three main modules. The input optics module (IOM) is an unobscured reflective Offner relay. In the IOM a Beam Steering Mirror (BSM) is included for spatial modulation and to allow efficient sky mapping. The Band and Mode Distributing Optics (BMDO) module splits the radiation band into the four different spectral bands and includes the MP-FTS. The field image existing at the output of the BMDO constitutes the entrance to the Grating Module Optics (GM). These modules provide spectral dispersion by means of linear and reflective diffraction gratings and the final image onto the detectors. Performances of the GMs are high demanding with a detector divided into 2 sub-bands with a different pixel size for each sub-band.Ítem Restringido The 4K focal plane unit for SPICA's SAFARI far infrared instrument(SPIE Digital Library, 2020-12-13) Torres Redondo, J.; Eggens, M.; García López, Rafael; Pérez Grande, I.; Pérez Álvarez, J.; Chimeno, M.; Arrazola Pérez, D.; Fernández, María Manuela; Belenguer Dávila, T.; González Fernández, L.; Evers, J.; Dieleman, P.; Jellema, W.; Roelfsema, P.; Martín Pintado, J.; Najarro, F.SPICA provided the next step in mid- and far-infrared astronomical research and was a candidate of ESA's fifth medium class Cosmic Vision mission. SAFARI is one of the spectroscopic instruments on board SPICA. The Focal Plane Unit (FPU) design and analysis represent a challenge both from the mechanical and thermal point of view, as the instrument is working at cryogenic temperatures between 4.8K and 0.05K. Being a large instrument, with a current best estimate of 148,7kg of mass, its design will have to be optimized to fit within the mission´s mass and volume budget. The FPU will also have to be designed for its modularity and accessibility due to the large number of subsystems that SAFARI had to accommodate, highlighting Fourier Transform Spectrometer Mechanism (FTSM) and the three grating-based point source spectrometer modules (GM) which operates at 1.7K in the FPU, the latter representing 60% of the total mass of the instrument
