Development and characterization of a 2D precision cryogenic chopper for METIS

Paalvast, S.L.; Huisman, R.; Brandl, Bernhard R.; Jassen, Huub; Jayawardhana, Bayu; Molster, Frank; Teuwen, Maurice; Venema, Lars

doi:10.1117/12.2054874

Cited by 9 publications

(10 citation statements)

References 4 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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“…An additional complication for the calibration of METIS arises from the fact that we cannot use the secondary mirror of the ELT for chopping at several Hz, but need to use an instrument-internal cryo-chopper [25]. Switching between onand off-axis positions will thus cause the footprint of the beam to vary on all mirrors upstream of the cryo-chopper.…”

Section: Thermal Background Subtractionmentioning

confidence: 99%

Status of the mid-IR ELT imager and spectrograph (METIS)

Brandl¹,

Absil

Agócs

et al. 2018

Ground-Based and Airborne Instrumentation for Astronomy VII

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METIS is one of the first three scientific instruments on the ELT, expected to see first light in 2025. METIS will provide diffraction limited imaging, coronagraphy, and low resolution slit spectroscopy over the 3 -19µm range. Furthermore, METIS will provide a unique combination of high resolution (R ~ 100,000) integral field spectroscopy and coronagraphy from 2.9 -5.3µm. The latter can be reconfigured to obtain a wider instantaneous wavelength coverage in exchange for integral field coverage. While METIS is a multi-purpose instrument for a wide range of infrared astronomy, its greatest strengths will be in the studies of exoplanets and proto-planetary disks.After two years into the preliminary design phase, the design of METIS has reached an advanced stage. This paper provides an update on the areas which have most advanced in the recent past: the main science drivers, the optical and opto-mechanical design, adaptive optics and the coronagraphy concept. We also describe the calibration of the instrument, give an overview of its observation modes, and present the schedule toward first light.

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“…For details about the MCCD mechatronic design, the reader is referred to [15]. Here, we summarize the key mechatronic elements of the mechanism and describe the experimental test setup.…”

Section: A Hardware and Test Setupmentioning

confidence: 99%

High-Performance Motion Control of the METIS Cold Chopper Mechanism

Huisman

Paalvast

Brandl

et al. 2016

IEEE/ASME Trans. Mechatron.

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We present the main results of the performance test campaign of the Mid-Infrared European Extremely Large Telescope Imager and Spectrograph (METIS) Cold Chopper Demonstrator (MCCD). This tip/tilt mirror, which operates at a temperature of 77 K, is one of the critical components in the METIS for the European Extremely Large Telescope. The performance requirements of the MCCD relate to the field of fast and very accurate reference tracking. We discuss the applicability of different high-performance motion control strategies and describe the control synthesis of a repetitive and of a novel hybrid controller. We identified the presence of nonlinearities in the plant, which limits the performance of the hybrid controller. The repetitive controller shows very promising results and can handle the nonlinearities in the system. This experimental phase concludes the MCCD program, which was initiated to verify the feasibility of a high-performance cryogenic tip/tilt mirror at an early stage in the METIS development. Because of the very promising test results, no significant changes to the hardware will be implemented. We believe that minor adjustments will suffice to meet all requirements of the final hardware after integration with the METIS instrument.

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Development and characterization of a 2D precision cryogenic chopper for METIS

Cited by 9 publications

References 4 publications

Heterodyne Receiver for Origins

Heterodyne Receiver for Origins

Status of the mid-IR ELT imager and spectrograph (METIS)

High-Performance Motion Control of the METIS Cold Chopper Mechanism

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