Journal
SPACE TELESCOPES AND INSTRUMENTATION 2020: OPTICAL, INFRARED, AND MILLIMETER WAVE
Volume 11443, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2562071
Keywords
Grating spectrometer; Fourier transform spectroscopy; TES bolometers
Funding
- Comunidad de Madrid through the Atraccion de Talento grant [2017-T1/TIC-5213]
- Spanish State Research Agency (AEI) Unidad de Excelencia Maria de Maeztu-Centro de Astrobiologia (INTA-CSIC) [MDM-2017-0737]
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SPICA is a space mission focusing on exploring the formation of galaxies, stars, and planets using the far infrared spectrometer SAFARI. SAFARI provides both low resolution and high resolution modes for observing complex spectral information. The data obtained will require accurate spectral and flux calibration.
SPICA is a mid to far infra-red space mission to explore the processes that form galaxies, stars and planets. SPICA/SAFARI is the far infrared spectrometer that provides near-background limited observations between 34 and 230 micrometers. The core of SAFARI consists of 4 grating modules, dispersing light onto 5 arrays of TES detectors per module. The grating modules provide low resolution (250) instantaneous spectra over the entire wavelength range. The high resolution (1500 to 12000) mode is accomplished by placing a Fourier Transform Spectrometer (FTS) in front of the gratings. Each grating module detector sees an interferogram from which the high resolution spectrum can be constructed. SAFARI data will be a convolution of complex spectral, temporal and spatial information. Along with spectral calibration accuracy of < 1 %, a relative flux calibration of 1% and an absolute flux calibration accuracy of 10% are required. This paper will discuss the calibration strategy and its impact on the instrument design of SAFARI
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