The calibration source assembly for SPICA/SAFARI instrument

Shiang-Yu Wang; MingJye Wang; Tse-Jun Chen; Yen-Pin Chang; Yen-Ru Huang; Chun-Lun Wang; Chuang-Ping Chiu; Ting-Hang Pei; Jaap Evers; David Arrazola; Martin Eggens; Sylvain Martin; Willem Jellema

doi:10.1117/12.2561197

13 December 2020 The calibration source assembly for SPICA/SAFARI instrument

Shiang-Yu Wang, MingJye Wang, Tse-Jun Chen, Yen-Pin Chang, Yen-Ru Huang, Chun-Lun Wang, Chuang-Ping Chiu, Ting-Hang Pei, Jaap Evers, David Arrazola, Martin Eggens, Sylvain Martin, Willem Jellema

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Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114436H (2020) https://doi.org/10.1117/12.2561197
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The far infrared instrument SAFARI spectrometer on board the SPace Infrared telescope for Cosmology and Astrophysics (SPICA) provides moderate resolution spectra (R~300) with simultaneous coverage over 34 to 230 μm. With the high sensitivity TES detectors, the SAFARI can reach the sensitivity down to ~7×10^-20 W/m². In order to provide accurate calibration for the TES readout circuit, a calibration source assembly (CSA) is developed to provide a stable and absolute flux radiation to the spectrometer over the whole spectral range. The CSA has a primary function during observations to take periodic reference measurement to correct for drift, subtracting backgrounds, etc from the detector. The CSA is composed of three microlamps and one integrating sphere. The microlamps are made of resistance wires by microlithography to mimic square blackbody sources. By combining an 81K microlamp and a 24K microlamp, a reasonably flat spectrum can be produced at the output of the integrating sphere. The radiation to the transition edge sensor detector pixel is around 1×10^-16 W. The integrating sphere can also provide a uniform output to cover the size of SAFARI field of view including the target and sky pixels. In this paper, the CSA design and the prototype results of the microlamp and the integrating sphere are presented.

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Shiang-Yu Wang, MingJye Wang, Tse-Jun Chen, Yen-Pin Chang, Yen-Ru Huang, Chun-Lun Wang, Chuang-Ping Chiu, Ting-Hang Pei, Jaap Evers, David Arrazola, Martin Eggens, Sylvain Martin, and Willem Jellema "The calibration source assembly for SPICA/SAFARI instrument", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114436H (13 December 2020); https://doi.org/10.1117/12.2561197

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