High-Performance Motion Control of the METIS Cold Chopper Mechanism

Huisman, R.; Paalvast, S.L.; Brandl, Bernhard R.; Dool, Teun van den; Eggens, Martin; Janssen, H. J. L.; Aitink-Kroes, Gabby; Molster, Frank; Teuwen, Maurice; Venema, Lars; Jayawardhana, Bayu

doi:10.1109/tmech.2016.2578678

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…HERO has only four mechanisms (Table 3). The Offner Relay [63][64][65][66] directs the sky beam to the respective frequency array with the help of a band selection mirror (see Fig. 4, insert 1) that has two axis of rotation.…”

Section: Mechanismsmentioning

confidence: 99%

Heterodyne Receiver for Origins

Wiedner¹,

Aalto²,

Amatucci³

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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The Heterodyne Receiver for Origins (HERO) is the first detailed study of a heterodyne focal plane array receiver for space applications. HERO gives the Origins Space Telescope the capability to observe at very high spectral resolution (R ¼ 10 7 ) over an unprecedentedly large far-infrared (FIR) wavelengths range (111 to 617 μm) with high sensitivity, with simultaneous dual polarization and dual-frequency band operation. The design is based on prior successful heterodyne receivers, such as Heterodyne Instrument for the Far-Infrared /Herschel, but surpasses it by one to two orders of magnitude by exploiting the latest technological developments. Innovative components are used to keep the required satellite resources low and thus allowing for the first time a convincing design of a large format heterodyne array receiver for space. HERO on Origins is a unique tool to explore the FIR universe and extends the enormous potential of submillimeter astronomical spectroscopy into new areas of astronomical research. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Mechanismsmentioning

confidence: 99%

Heterodyne Receiver for Origins

Wiedner¹,

Aalto²,

Amatucci³

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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A Proposed Heterodyne Receiver for the Origins Space Telescope

Wiedner

Mehdi

Baryshev

et al. 2018

IEEE Trans. THz Sci. Technol.

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The HEterodyne Receiver for the Origins Space Telescope (HERO) is a proposed design for a heterodyne focal plane array for a large space mission. The Origins Space Telescope (OST) is one of the four missions selected to be studied by NASA for the 2020 Astronomy and Astrophysics Decadal survey. HERO is designed to observe the trail of water from the interstellar medium (ISM) to disks around protostars. In Concept 1, HERO provides continuous frequency coverage from 468 to 2700 GHz in

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Manufacturing requirements and challenges of the fully integrated monolithic aluminium cryogenic tip-tilt mirror for the METIS instrument

Dijkstra,

Tromp,

Versteeg

et al. 2024

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI

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The chopper is a cryogenic tip-tilt mechanism in the Common Fore Optics (CFO) of METIS, the mid-infrared imager and spectrograph for ESO's Extremely Large Telescope (ELT). In this paper we delve into the milling process of the mirror of the chopper mechanism, denominated as CM5. This highly accurate mirror is fully integrated into a tip-tilt mechanism and operates to reduce the background noise by shifting between the target object and the background, this happens with a frequency of 5Hz. We will primarily focus on the challenges encountered during the mirror-mechanism fabrication. Notably, the tip/tilt mechanism in the chopper requires precision levels that surpass the accuracy of the 5-axis milling machine that is used. The general accuracy of the used machine on a multi sided part is typically 20 to 30 microns, and is dominated by thermal drift of the machine itself. This significantly increases the manufacturing complexity, therefore a specialized production methodology was devised to ensure the achievement of the micron-level tolerances. In the next paragraphs we will describe how the critical tolerances of down to 5 microns in the mechanism features have been achieved. The use of a so-called Golden Sample provides a known and stable reference during manufacturing, allowing to bypass the drift and static errors of the machine. The usage of CMM measurements proves that the developed production method delivers excellent results overcoming the limitations of the machine accuracy. This monolithic aluminium cryogenic mirror has been produced through in-house CNC programming, milling, and thermal ageing followed by thermal cycling, Single point diamond turning (SPDT) and Wire Electrical Discharging Machining (Wire EDM) by external suppliers. After SPDT of the optical surface, the surface is polished to optical quality and finally a gold coating layer is applied to increase the reflectivity in the desired wavelength.

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High-Performance Motion Control of the METIS Cold Chopper Mechanism

Cited by 4 publications

References 22 publications

Heterodyne Receiver for Origins

Heterodyne Receiver for Origins

A Proposed Heterodyne Receiver for the Origins Space Telescope

Manufacturing requirements and challenges of the fully integrated monolithic aluminium cryogenic tip-tilt mirror for the METIS instrument

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