Dr. Justin T. Erwin Profile

Dr. Justin T. Erwin

at Royal Belgian Institute for Space Aeronomy

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Author

Publications (5)

Proceedings Article | 3 October 2024 Poster + Paper

Scientific objectives and instrumental requirements of the IR spectrometer VenSpec-H onboard EnVision

S. Robert, J. Erwin, R. De Cock, I. Thomas, N. Pereira, L. Jacobs, S. Berkenbosch, D. Bolsée, F. Vanhellemont, E. Neefs, S. Aoki, B. Bézard, E. Marcq, G. Alemanno, J. Helbert, A. Vandaele

Proceedings Volume 13144, 131440W (2024) https://doi.org/10.1117/12.3027948

KEYWORDS: Venus, Spectroscopy, Radiative transfer, Spectral resolution, Clouds, Molecular spectroscopy, Molecules, Infrared spectroscopy, Infrared radiation, Atmospheric modeling

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Proceedings Article | 3 October 2024 Presentation + Paper

Design of the VenSpec-H instrument on ESA’s EnVision mission: development of critical elements, highlighting the FFCP, and grating

Roderick De Cock, Séverine Robert, Eddy Neefs, Justin Erwin, Michael Vervaeke, Hugo Thienpont, Etienne Renotte, Philippe Klinkenberg, Benoit Borguet, Solal Thomas, Wouter Moelans, Aaron Algoedt, Lieve De Vos, Ramatha Sørensen, Moshe Blau, Ann Carine Vandaele, Ian Thomas, Sophie Berkenbosch, Lars Jacobs, Pieter Bogaert, Bram Beeckman, Ansje Brassine, Neophytos Messios, Erwin De Donder, David Bolsée, Nuno Pereira, Bojan Ristic, Paul Tackley, Taras Gerya, Stefan Kögl, Paola Kögl, Hans-Peter Gröbelbauer, Florian Wirz, Gerhard Stefan Székely, Nick Eaton, Elena Roibás-Millán, Ignacio Torralbo, Higinio Rubio-Arnaldo, José Miguel Álvarez, Daniel Navajas Ortega, Daphne Stam, Jose Castro-Marin, Jaime Jiménez Ortega, Luisa Lara, Jörn Helbert, Giulia Alemanno, Emmanuel Marcq

Proceedings Volume 13144, 131440E (2024) https://doi.org/10.1117/12.3027637

KEYWORDS: Instrumentation engineering, Optical instrument design, Remote sensing, Equipment, Sensors, Spectroscopy, Optical gratings, Optical filters, Optical surfaces, Windows, Manufacturing, Echelle gratings

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EnVision is ESA’s upcoming mission to Venus with a launch scheduled in 2031. One of the payloads on board is the VenSpec suite,1 containing three spectrometer channels, one of which is VenSpec-H. VenSpec-H (Venus Spectrometer with High resolution) performs absorption measurements in the atmosphere of Venus in four near-infrared spectral bands. VenSpec-H is developed under Belgian management and builds on heritage from instruments on Venus-Express and TGO. Techniques used in these precursor instruments are improved and complemented with new technologies to comply with the scientific goals of the EnVision mission. The operating wavelength range (1.15 - 2.5 μm) imposes stringent temperature requirements on the instrument to make nightside measurements below the Venus clouds possible. Most importantly, the spectrometer’s optical components are held in a separate cold section inside the instrument, cooled down to −45°C, to remove thermal background from the signal. To avoid heat dissipation close to the spectrometer optics, the electronic boards are kept in a separate box. Besides that, some mechanisms, placed in the warmer part of the instrument at the entrance or exit of the cold section, had to be developed: a turn window unit to protect the interior of the instrument during the aerobraking phase of the mission, a filter wheel mechanism to select the spectral bands of interest, and an integrated detector-cooler-assembly to register the spectra. Some passive optical elements in the spectrometer had low technological readiness at the start of the project. One of them is a freeform corrector plate, used to compensate for aberrations introduced in the system by a parabolic mirror. This device is developed by the Brussels Photonics lab of VUB (Brussels) using a supply chain with shape adaptive corrective polishing and dedicated metrology. Another is the echelle grating, used to disperse the incoming light into its spectral components, which is built by AMOS. Both devices are highlighted in this article.

Proceedings Article | 3 October 2024 Presentation + Paper

Electrical integration of the VenSpec spectrometer consortium: an architecture trade-off

Alexander Fitzner, Lisa Hafemeister, Simone Del Togno, Horst-Georg Lötzke, Belinda Wendler, Friederike Wolff, Jörn Helbert, Pablo Gutiérrez-Marqués, Andreas Nathues, Henry Perplies, Alexander Loose, Henning Fischer, Vrushabh Marlur, Ian Hall, Reinhard Meller, Jose Castro, Jaime Jiménez Ortega, Luisa Lara, Fernando Alvarez, Álvaro Mazuecos Nogales, Björn Fiethe, Andrès Gómez, Dennis Buchhorn, Eddy Neefs, Roderick De Cock, Justin Erwin, Séverine Robert, Ann-Carine Vandaele, Sophie Berkenbosch, Till Hagelschuer, Gisbert Peter, Martin Pertenais, Benjamin Lustrement, Rafik Hassen-Khodja, Francis Vivat, Sandrine Bertran, Emmanuel Marcq, Vanderlei Cunha Parro, Rodrigo de Marca França

Proceedings Volume 13144, 131440D (2024) https://doi.org/10.1117/12.3027605

KEYWORDS: Spectroscopy, Space operations, Switches, Interfaces, Design, Power supplies, Venus, Engineering, Equipment, Computer networks

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Proceedings Article | 3 October 2024 Presentation + Paper

The VenSpec suite organization: collaborative development from instrument proposal to scientific analysis

Friederike Wolff, Jörn Helbert, Giulia Alemanno, Emmanuel Marcq, Ann-Carine Vandaele, Sévrine Robert, Louisa Maria Lara, Andreas Nathues, Vanderlei Cunha Parro, Sandrine Bertran, Justin Erwin, Gisbert Peter, Benjamin Lustrement, Eddy Neefs, Roderick de Cock, Till Hagelschuer, Lisa Hafemeister, Jose Maria Castro, Pablo Gutierrez-Marques

Proceedings Volume 13144, 131440C (2024) https://doi.org/10.1117/12.3027459

KEYWORDS: Equipment, Venus, Space operations, Spectrometers, Engineering, Interfaces, Design, Clouds, Lead, Solar system

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Proceedings Article | 3 October 2024 Presentation + Paper

Development of a filter wheel for VenSpec-H

Gerhard Székely, Eddy Neefs, Robert Eberli, Marco Grossmann, Samuel Tenisch, Hans-Peter Gröbelbauer, Florian Wirz, Pascal Seiler, Paola Kögl, Stefan Kögl, Lars Jacobs, Sophie Berkenbosch, Ann-Carine Vandaele, Paul Tackley, Taras Gerya, Roderick De Cock, Justin Erwin, Séverine Robert, Nuno Pereira

Proceedings Volume 13144, 131440F (2024) https://doi.org/10.1117/12.3028000

KEYWORDS: Tunable filters, Breadboards, Optical filters, Venus, Design, Spectroscopy, Equipment, Vibration, Sensors, Vacuum

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