Cryogenic testing towards TRL-5 demonstration of a novel stiffness-compensated, reactionless scan mechanism for the Fourier transform spectrometer of SPICA SAFARI instrument

Alain Cournoyer; Éric Carbonneau; Patrick Gilbert; Ian Silversides; Simon Houle; Martin Larouche; Hugo Bourque; Geneviève Delisle; Frédéric Grandmont; David Naylor; Brad Gom; Ben Louwerse

doi:10.1117/12.2627861

31 August 2022 Cryogenic testing towards TRL-5 demonstration of a novel stiffness-compensated, reactionless scan mechanism for the Fourier transform spectrometer of SPICA SAFARI instrument

Alain Cournoyer, Éric Carbonneau, Patrick Gilbert, Ian Silversides, Simon Houle, Martin Larouche, Hugo Bourque, Geneviève Delisle, Frédéric Grandmont, David Naylor, Brad Gom, Ben Louwerse

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121902E (2022) https://doi.org/10.1117/12.2627861
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The high spectral resolution mode of the SpicA FAR-infrared Instrument (SAFARI) is enabled by inserting a Fourier Transform Spectrometer (FTS), based on a Martin-Puplett interferometer, into the signal path of the instrument. The cryogenic FTS mechanism (FTSM) enables linear scans of two back-to-back rooftop mirrors sharing a common apex. ABB Inc. is under contract with the Canadian Space Agency to develop and test at 4 K an FTSM Engineering Demonstration Unit (EDU) for TRL-5 demonstration. The main SAFARI FTSM performance drivers are the stringent mechatronic demands (position stability of roof-top mirrors in step scan mode <10 nm RMS, velocity jitter in constant velocity mode <1% RMS at 85 µm/s, linear stroke <34 mm, error on position feedback laser metrology <10 nm RMS) and ultra-low photon leakage level from laser metrology (<1 pW), severely constrained by a tight thermal budget (heat dissipation <1.5 mW) under a specific micro-vibration environment (30 µg/√Hz external), all at cryogenic temperatures (4 K). In this paper, we describe the FTSM EDU developed and built at ABB with its laser metrology sensor. The FTSM EDU is based on a novel cryogenic design presented in 2020 using a reactionless and long-stroke flexure-based 4-bar linkage with stiffness compensation and a custom moving magnet actuator. Results from FTSM EDU room-temperature characterization and cryogenic proof-of-concept tests conducted at University of Lethbridge as a key step towards TRL-5 demonstration are discussed to assess the compliance of this novel design to the challenging cryogenic SAFARI FTSM performance requirements.

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Alain Cournoyer, Éric Carbonneau, Patrick Gilbert, Ian Silversides, Simon Houle, Martin Larouche, Hugo Bourque, Geneviève Delisle, Frédéric Grandmont, David Naylor, Brad Gom, and Ben Louwerse "Cryogenic testing towards TRL-5 demonstration of a novel stiffness-compensated, reactionless scan mechanism for the Fourier transform spectrometer of SPICA SAFARI instrument", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121902E (31 August 2022); https://doi.org/10.1117/12.2627861

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