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The Heterodyne Spectrometer Instrument (HSI) is one of two instruments designed for the recently submitted Far-IR Spectroscopy Space Satellite proposal to NASA. HSI stands out as the first heterodyne array receiver for a space mission. It covers a broad bandwidth range between 150 and 600 microns in just three bands, each equipped with two 5-pixel arrays. HSI facilitates dual-polarization, multi-pixel, and multi-frequency observations on a satellite, achieved through careful design and the utilization of low-heat dissipating, low-power, yet high TRL components. We provide details of the optical design and present a solution for thermal/background compatibility between the direct detector and heterodyne instrument.
Baryshev et al. (Fri,) studied this question.
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