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See detailConception of a near-infrared spectrograph for the observation of massive stars
Kintziger, Christian ULiege

Doctoral thesis (2018)

This research contribution intends to introduce the conception of a new fiber-fed spectrograph, called NƎSIE, that operates in the near-infrared domain. This PhD thesis was part of a research project led ... [more ▼]

This research contribution intends to introduce the conception of a new fiber-fed spectrograph, called NƎSIE, that operates in the near-infrared domain. This PhD thesis was part of a research project led by Prof. Rauw which focuses on massive stars. The final location of NƎSIE will be the TIGRE telescope located in La Luz, Mexico. The observational data provided by this instrument will help several research groups from the University of Liège to study massive stars. In particularly, evolution models will be improved through the comparison of the collected spectra with theoretical models. This collaboration will therefore contribute to a better understanding of massive stars and the mechanisms that take place within these extraordinary objects. [less ▲]

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See detailA 3U CubeSat to Collect UV Photometry of Bright Massive Stars
Desselle, Richard ULiege; Kintziger, Christian ULiege; Rochus, Pierre ULiege et al

in Journal of Small Satellites (2017), 6(3), 635-650

Following the amazing progresses in miniaturizing essential components of spacecraft, the last decade has witnessed an important development of nano- and micro-satellites. Beyond the mere technological ... [more ▼]

Following the amazing progresses in miniaturizing essential components of spacecraft, the last decade has witnessed an important development of nano- and micro-satellites. Beyond the mere technological experiment, these small satellites are now considered as important complements of much larger and more sophisticated probes to do scientific research. In this context we have conducted a feasibility study of a near-UV telescope on-board a 3U CubeSat. The scientific purpose of this payload will be to collect time series of photometric measurements of bright, mainly massive, stars down to an optical magnitude of V=5. This paper presents the optimized optical design of the payload and its associated detector. We further discuss the system accommodation and integration as well as a preliminary mission analysis. A photometric budget taking into account the characteristics of the target stars and the payload performances is also presented. With this feasibility study we demonstrate that it is possible to do a robust science mission using a very small satellite and for a limited cost. [less ▲]

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See detailDesign, assembly and test of a near-infrared spectrograph for the TIGRE telescope
Kintziger, Christian ULiege

Scientific conference (2017, September 15)

The presentation introduces the different major steps of the design of a near-infrared spectrograph that will be installed at the TIGRE telescope, Mexico.

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See detailConception of a near-infrared spectrometer for ground-based observations of massive stars
Kintziger, Christian ULiege; Desselle, Richard ULiege; Loicq, Jerôme ULiege et al

in Journal of Astronomical Telescopes, Instruments, and Systems (2017), 3(1), 015002

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument for stellar astrophysics. Starting from the derivation of theoretical relationships from the ... [more ▼]

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument for stellar astrophysics. Starting from the derivation of theoretical relationships from the scientific requirements and telescope characteristics, the entire optical design of the spectrograph is presented. Specific optical elements, such as a toroidal lens, are introduced to improve the instrument’s efficiency. Then the verification of predicted optical performances is investigated through optical analyses, such as resolution checking. [less ▲]

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See detailFeasibility study of a UV photometer on-board a 3 CubeSat for the study of bright massive stars
Desselle, Richard ULiege; Kintziger, Christian ULiege; Rauw, Grégor ULiege et al

Conference (2016, September 07)

Following the amazing progresses in miniaturizing essential components of spacecraft, the last decade has witnessed an important development of nano- and micro-satellites. Beyond the mere technological ... [more ▼]

Following the amazing progresses in miniaturizing essential components of spacecraft, the last decade has witnessed an important development of nano- and micro-satellites. Beyond the mere technological experiment, these small satellites are now considered as important complements of much larger and more sophisticated probes to do scientific research. In this context we are conducting a feasibility study of a UV photometer on-board a 3U CubeSat. The scientific purpose of this payload will be to collect time series of photometric measurements of bright massive stars. These massive stars are very hot and luminous objects emitting copious amounts of UV radiation. The properties of these stars during their life and their death in gigantic supernova explosions make them key players for the evolution of the Universe. The UV photometer will be used for imaging photometric observations of massive stars in the spectral range from 250 to 350 nm. The strength of space photometry is the absence of signal perturbation by the Earth’s atmosphere and the continuity of the time-series. Precisely measuring photometric variations allows studying radial and non-radial pulsations of stars. This discipline, called asteroseismology, is currently the most powerful technique for probing the physical conditions in the interiors of stars. An important problem in asteroseismology of massive stars is the mode identification. Simultaneous observations in the near UV (250-350 nm) and in the visible (600 nm) provide the best combination for precise and accurate mode identification based on amplitude ratios in massive stars. Data in the latter pass-band are currently covered by the satellites of the BRITE constellation. Combining the observations of our instrument with those of BRITE will hence result in unprecedented results for pulsating massive stars. The baseline for the UV photometer is a Ritchey-Chrétien telescope composed of two reflective hyperbolic mirrors that focalize the light coming from space onto a focal plane protected by an optical filter. We will present the optimized optical design of the payload and its associated optical sensor. A photometric budget taking into account the characteristics of the target’s stars and the payload performances will also be presented. We will further discuss the observation strategy. Finally, the accommodation of the payload in the spacecraft and its sub-units will be shown as well as mission and preliminary thermal analyses of the whole system obtained after accommodation. [less ▲]

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See detailConception of a near-IR spectrometer for ground-based observations of massive stars
Kintziger, Christian ULiege; Desselle, Richard ULiege; Loicq, Jerôme ULiege et al

in Proc. SPIE Volume 9908 Ground-based and Airborne Instrumentation for Astronomy VI (2016, August 09)

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships ... [more ▼]

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships from the scientific requirements and telescope characteristics, the entire optical design of the spectrograph is presented. Specific optical elements, such as a toroidal lens, are introduced to improve the instrument’s performances. Then, the verification of predicted optical performances is investigated through optical analyses such as resolution checking. Eventually, the star positioning system onto the central fiber core is explained. [less ▲]

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See detailConception of a near-IR spectrometer for ground-based observations of massive stars
Kintziger, Christian ULiege; Desselle, Richard ULiege; Loicq, Jerôme ULiege et al

Poster (2016, June 27)

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships ... [more ▼]

In our contribution, we outline the different steps in the design of a fiber-fed spectrographic instrument that intends to observe massive stars. Starting from the derivation of theoretical relationships from the scientific requirements and telescope characteristics, the entire optical design of the spectrograph is presented. Specific optical elements, such as a toroidal lens, are introduced to improve the instrument’s performances. Then, the verification of predicted optical performances is investigated through optical analyses such as resolution checking. Eventually, the star positioning system onto the central fiber core is explained. [less ▲]

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See detailOptical design and optical properties of a VUV spectrographic imager for ICON mission
Loicq, Jerôme ULiege; Kintziger, Christian ULiege; Mazzoli, Alexandra ULiege et al

in Proceedings of SPIE (2016, June)

In the frame of the ICON (Ionospheric Connection Explorer) mission of NASA led by UC Berkeley, CSL and SSL Berkeley have designed in cooperation a new Far UV spectro-imager. The instrument is based on a ... [more ▼]

In the frame of the ICON (Ionospheric Connection Explorer) mission of NASA led by UC Berkeley, CSL and SSL Berkeley have designed in cooperation a new Far UV spectro-imager. The instrument is based on a Czerny-Turner spectrograph coupled with two back imagers. The whole field of view covers [± 12° vertical, ± 9° horizontal]. The instrument is surmounted by a rotating mirror to adjust the horizontal field of view pointing by ± 30°. To meet the scientific imaging and spectral requirements the instrument has been optimized. The optimization philosophy and related analysis are presented in the present paper. PSF, distortion map and spectral properties are described. A tolerance study and alignment cases were performed to prove the instrument can be built and aligned. Finally straylight and out of band properties are discussed. [less ▲]

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See detailAlignment and calibration of the ICON-FUV instrument: Development of a vacuum UV facility
Loicq, Jerôme ULiege; Blain, Pascal ULiege; Kintziger, Christian ULiege et al

in Proceedings of SPIE (2016, June)

The optical calibration of the ICON-FUV instrument requires designing specific ground support equipment (GSE). The ICON-FUV instrument is a spectrographic imager that operates on two specific wavelengths ... [more ▼]

The optical calibration of the ICON-FUV instrument requires designing specific ground support equipment (GSE). The ICON-FUV instrument is a spectrographic imager that operates on two specific wavelengths in the UV (135.6 nm and 157 nm). All the operations have to be performed under vacuum UV light. The optical setup is based on a VUV monochromator coupled with a collimator that illuminates the FUV entrance slit. The instrument is placed on a manipulator providing fields pointing. Image quality and spectral properties can be then characterized for each field. OGSE, MGSE, optical calibration plan and vacuum alignment of the instrument are described. [less ▲]

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See detailVUV Optical Ground System Equipment and its application to the ICON FUV flight grating characterization and selection
Blain, Pascal ULiege; Desselle, Richard ULiege; Domken, Isabelle ULiege et al

in Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation (2016, June)

ICON FUV is a two channel spectrographic imager that measures intensity and spatial distribution of oxygen (135.6 nm) and molecular nitrogen (157 nm) of the ionosphere. As those wavelengths are strongly ... [more ▼]

ICON FUV is a two channel spectrographic imager that measures intensity and spatial distribution of oxygen (135.6 nm) and molecular nitrogen (157 nm) of the ionosphere. As those wavelengths are strongly absorbed by the atmosphere, the optical elements of the system have to be tested inside vacuum chambers. Prior to the instrument alignment and calibration, two 3600 gr/mm gratings were characterized. The primary focus is the measurement of the diffraction efficiencies; while the second objective is to select the best grating and to define which is the flight and the spare. A dedicated setup has been developed to assess the grating optical performances under vacuum. A 1 cm diameter collimated beam is generated using an off-axis parabola and a UV source at its focal point. The grating is placed at the center of two rotation stages collinearly aligned. One detector is placed on a rotating arm, deported from its rotation center. A PMT detector records diffracted light intensity with respect to its angular position and its wavelength. Angular incidence on the grating is tuned with the help of the second rotation stage. The grating efficiency homogeneity and scattering properties are measured through a Y-X scan. [less ▲]

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See detailDesign and modelisation of ASPIICS optics
Galy, Camille ULiege; Fineschi, S.; Galano, D. et al

in Proc. SPIE Volume 9604 Solar Physics and Space Weather Instrumentation VI (2015, September 21)

In the framework of development of ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun), the Centre Spatial de Liege is responsible of the optical design ... [more ▼]

In the framework of development of ASPIICS (Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun), the Centre Spatial de Liege is responsible of the optical design of the coronagraph and the optics will be manufactured by TOPTEC. The particularity of this coronagraph is to have an external occulter located 150 m ahead of the first imaging lens. This external occulter is re-imaged on an internal occulter which function is - as in a classical externally occulted Lyot coronagraph - to block the sun light diffracted by the external occulter and to reduce the straylight on the detector. The selection of this configuration is driven by the requirement to observe the corona as close as possible to the solar limb (i.e. 1 RSun) without imaging the limb itself. A requirement of 1.08 RSun is specified at optical design level to grant 1.2 Rsun at instrument level. The coronograph instrument is designed to have a field of view of 1.6° x 1.6° with a resolution of less than 6 arcsec. Its performances are limited by diffraction in a 530 – 590 nm wavelength range. This paper presents the optical design and demonstrates that by design the requirements are fulfilled within the misalignment, manufacturing and thermo-elastic error contributions. [less ▲]

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See detailASPIICS: an externally occulted coronagraph for PROBA-3.Design evolution.
Renotte, Etienne ULiege; Carmen Baston, Elena; Bemporad, Alessandro et al

in SPIE 9143, Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave (2014)

PROBA-3 is a mission devoted to the in-orbit demonstration of precise formation flying techniques and technologies for future ESA missions. PROBA-3 will fly ASPIICS (Association de Satellites pour ... [more ▼]

PROBA-3 is a mission devoted to the in-orbit demonstration of precise formation flying techniques and technologies for future ESA missions. PROBA-3 will fly ASPIICS (Association de Satellites pour l’Imagerie et l’Interferométrie de la Couronne Solaire) as primary payload, which makes use of the formation flying technique to form a giant coronagraph capable of producing a nearly perfect eclipse allowing to observe the sun corona closer to the rim than ever before. The coronagraph is distributed over two satellites flying in formation (approx. 150m apart). The so called Coronagraph Satellite carries the camera and the so called Occulter Satellite carries the sun occulter disc. This paper is reviewing the design and evolution of the ASPIICS instrument as at the beginning of Phase C/D. [less ▲]

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See detailFeasibility of a UV imager onboard a Cubesat platform
Kintziger, Christian ULiege

Master's dissertation (2013)

This Master thesis presents the feasibility study of an ultraviolet imager onboard a Cubesat platform. The goal is to observe the Io's torus with the help of a triple unit Cubesat. Similar projects are ... [more ▼]

This Master thesis presents the feasibility study of an ultraviolet imager onboard a Cubesat platform. The goal is to observe the Io's torus with the help of a triple unit Cubesat. Similar projects are studied to identify possible components for the mission. A mission analysis is carried out to highlight suitable intervals of time to observe the Io's torus when considering different orbits. Then optical design processes are performed to obtain a telescope that fits in the Cubesat platform. Eventually a final design that fulfils all the scientific requirements is introduced and a few perspectives are proposed for the future studies. [less ▲]

Detailed reference viewed: 39 (9 ULiège)