82 research outputs found
Design of the VenSpec-H instrument on ESA¿s EnVision mission: development of critical elements, highlighting the FFCP, and grating
No full textDe Cock, Roderick et al.-- Full list of authors: De Cock, Roderick; Robert, Séverine; Neefs, Eddy; Erwin, Justin; Vervaeke, Michael; Thienpont, Hugo; Renotte, Etienne; Klinkenberg, Philippe; Borguet, Benoit; Thomas, Solal; Moelans, Wouter; Algoedt, Aaron; De Vos, Lieve; Sørensen, Ramatha; Blau, Moshe; Vandaele, Ann Carine; Thomas, Ian R.; Berkenbosch, Sophie; Jacobs, Lars; Bogaert, Pieter; Beeckman, Bram; Brassine, Ansje; Messios, Neophytos; De Donder, Erwin; Bolsée, David; Pereira, Nuno; Ristic, Bojan; Tackley, Paul J.; Gerya, Taras; Kögl, Stefan; Kögl, Paola; Gröbelbauer, Hans-Peter; Wirz, Florian; Székely, Gerhard Stefan; Eaton, Nick; Roibás-Millán, Elena; Torralbo, Ignacio; Rubio-Arnaldo, Higinio; Álvarez, José Miguel; Navajas Ortega, Daniel; Stam, Daphne; Castro-Marin, Jose M.; Jiménez Ortega, Jaime; Lara, Luisa; Helbert, Jörn; Alemanno, Giulia; Marcq, Emmanuel.-- Part of the Proceedings of SPIE- - The International Society for Optical Engineering Volume 13144 article number 131440E Infrared Remote Sensing and Instrumentation XXXII 2024 San Diego18 August 2024 through 20 August 2024 Code 204177The VenSpec-H development is under the responsibility of a Belgian Instrument Lead team (BIRA-IASB, Brussels). Contributions are provided by research institutes or industrial companies in Europe:
• in Switzerland: ETHZ, KOEGL Space, FHNW, HSLU, and Space Acoustics;
• in Spain: IDR-UPM and IAA-CSIC;
• in The Netherlands: Leiden Observatory;
• in Germany: DLR and AIM;
• in Belgium: OIP, AMOS and B-PHOT VUB.
Support was also received from the EnVision (study and) project team and the PRODEX team at ESTEC.
The optical design work and the development of the FFCP, the grating and the TWU are made possible
thanks to funding by the Belgian Science Policy Office (BELSPO). The development of the FWM is made possible thanks to funding by the Swiss Space office (SSO). The European Space Agency (ESA) was in charge for
the purchase of the IDCA.
VenSpec-H work not specifically mentioned in this paper (e;g., mechanical and electrical development), falls
under funding from the Belgian Science Policy Office (BELSPO) (Prodex Experiment Agreement C4000128137),
the Swiss Space office (SSO) (Prodex Experiment Agreements 4000138690, 4000138246 and 4000138247) and
the Spanish Agencia Estatal de Investigaci´on (grants PID2021-126365NB-C21 and PID2021-126365NA-C22).
Funding from Belgium and Spain was financially and contractually coordinated by the ESA Prodex Office.
EM acknowledges support from CNES and ESA for all EnVision-related activities
Design of the VenSpec-H instrument on ESA's EnVision mission: Development of critical elements, highlighting the wavefront corrector and grating
No full textDe Cock, Roderick et al.-- Full list of authors: De Cock, Roderick; Robert, Séverine; Neefs, Eddy; Erwin, Justin; Vervaeke, Michael; Thienpont, Hugo; Renotte, Etienne; Klinkenberg, Philippe; Borguet, Benoit; Thomas, Solal; Moelans, Wouter; Algoedt, Aaron; De Vos, Lieve; Sørensen, Ramatha; Blau, Moshe; Carine Vandaele, Ann; Thomas, Ian R.; Berkenbosch, Sophie; Jacobs, Lars; Bogaert, Pieter; Beeckman, Bram; Brassine, Ansje; Messios, Neophytos; De Donder, Erwin; Bolsée, David; Pereira, Nuno; Ristic, Bojan; Tackley, Paul J.; Gerya, Taras; Kögl, Stefan; Kögl, Paola; Gröbelbauer, Hans-Peter; Wirz, Florian; Székely, Gerhard Stefan; Eaton, Nick; Roibás-Millán, Elena; Torralbo, Ignacio; Rubio-Arnaldo, Higinio; Álvarez, José Miguel; Ortega, Daniel Navajas; Stam, Daphne; Castro-Marin, Jose M.; Ortega, Jaime Jiménez; Lara, Luisa; Helbert, Jörn; Alemanno, Giulia; Marcq, Emmanuel.EnVision is the European Space Agency’s upcoming mission to Venus with a launch scheduled in 2031. One of the payloads on board is the Venus Spectrometers (VenSpec) suite, containing three spectrometer channels, one of which is Venus Spectrometer with high resolution (VenSpec-H). VenSpec-H 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 Trace Gas Orbiter. The operating wavelength range (1.15 to 2.5μm) 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 the thermal background from the signal. Some passive optical elements in the cold spectrometer had low technological readiness at the start of the project. One of them is a wavefront corrector: the 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 Vrije Universiteit Brussel 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 Advanced Mechanical and Optical Systems. We highlight the manufacturing and metrology processes of both devices. Besides that, some mechanisms, placed in the warmer part of the instrument, 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 © The AuthorsThe VenSpec-H development is under the responsibility of a Belgian Instrument Lead team (BIRA-IASB, Brussels). Contributions are provided by research institutes or industrial companies in Europe:
• in Switzerland: ETHZ, KOEGL Space, FHNW, HSLU, and Space Acoustics;
• in Spain: IDR-UPM and IAA-CSIC;
• in the Netherlands: Leiden Observatory;
• in Germany: DLR and AIM;
• in Belgium: OIP, AMOS, and B-PHOT VUB.
Support was also received from the EnVision (study and) project team and the PRODEX team at ESTEC.
The optical design work and the development of the FFCP, the grating, and the TWU are made possible, thanks to the funding of the Belgian Science Policy Office (BELSPO). The development of the FWM is made possible thanks to the funding of the Swiss Space Office (SSO). The ESA was in charge of the purchase of the IDCA. VenSpec-H work, not specifically mentioned in this paper (e.g., mechanical and electrical development), falls under funding from the Belgian Science Policy Office (BELSPO) (Prodex Experiment Agreement No. 4000128137), the Swiss Space Office (SSO) (Prodex Experiment Agreement Nos. 4000138690, 4000138246, and 4000138247), and the Spanish Agencia Estatal de Investigación (Grant Nos. PID2021-126365NB-C21 and PID2021-126365NA-C22). Funding from Belgium and Spain was financially and contractually coordinated by the ESA Prodex Office.
E.M. acknowledges support from CNES and ESA for all EnVision-related activities.
This paper was produced for SPIE optics and photonics 2024.25,26Peer reviewe
Frequency Synthesis for Fully Integrated Wireless Receivers in Deep Sub-Micron CMOS Technologies
No full textHet gevoerde onderzoek past in het kader van de steeds verdergaande zoektocht naar kleinere, goedkopere, volledigere en daardoor vaak complexere geïntegreerde schakelingen. Met als ultiem doel de één-chip oplossing wordt gemikt op een monolithische integratie, m.a.w. het vermijden van zoveel mogelijk discrete componenten. Omwille van de lage kostprijs, laag vermogen en potentiële integratie samen met digitale functionaliteit, wordt gekozen voor Si CMOS technologieën in dit werk.Dit werk bespreekt één van de sleutelcomponenten van een dergelijk monolithisch systeem: de frequentie synthesizer. Als specifieke implementatiestijl voor de synthesizer wordt gekozen voor de fase gesloten lus (PLL).Op een systematische manier wordt het ontwerp van een lage ruis, laag vermogen frequentie synthesizer onderzocht. Een belangrijk onderdeel van een PLL vormt de generatie van het lokale kloksignaal. Daarom wordt de spanningsgestuurde oscillator (VCO) in meer detail behandeld. Een grafische ontwerp strategie is ontwikkeld die toelaat de optimale performantie te bereiken rekening houdend met alle ontwerpspecificaties.De PLL zelf wordt besproken op systeem en op circuitniveau. Een systematische ontwerpstrategie wordt gegeven die eveneens op grafische wijze de ontwerpruimte afbakent waarbinnen het optimale ontwerp zich bevindt. Het onderzoek wordt geïllustreerd met twee voorbeelden: het ontwerp van een PLL voor een GPS ontvanger en een laag vermogen synthesizer bruikbaar onder lage voedingsspanningen. Mogelijke toepassingen voor een dergelijk systeem zijn onder andere gedistribueerde sensornetwerken, interactief speelgoed, identificatie (RFID)
Bij deze realisatie wordt naast het ontwerp voor lage voedingsspanning ook meer nadruk gelegd op het robuuste ontwerp van een dergelijk systeem om een maximaal productierendement te garanderen. Onder wisselende proces- en omgevingsvariabelen kunnen sommige systeemparameters immers sterk wijzigen.status: Publishe
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