Dr. Harald Frey Profile

Dr. Harald Frey

at Space Sciences Lab

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Author

Publications (9)

Proceedings Article | 25 September 2017 Open Access

V-UV spectrographic imager (FUV) for Icon mission: from optical design to vacuum calibration

Pascal Blain, Richard Desselle, Yvan Stockman, Kodi Rider, Stephen Mende, Jérôme Loicq, Christian Kintziger, Cathy Chou, Harald Frey

Proceedings Volume 10562, 1056236 (2017) https://doi.org/10.1117/12.2296047

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Proceedings Article | 22 July 2016 Paper

VUV optical ground system equipment and its application to the ICON FUV flight grating characterization and selection

Yvan Stockman, Harald Frey, Stephen Mende, Jerome Loicq, Pascal Blain, Richard Desselle, Isabelle Domken, Christian Kintziger, Etienne Renotte, Cathy Chou, Kodi Rider

Proceedings Volume 9912, 99124O (2016) https://doi.org/10.1117/12.2233133

KEYWORDS: Diffraction gratings, Diffraction, Ultraviolet radiation, Vacuum ultraviolet, Calibration, Imaging systems, Sensors, Mirrors, Beam splitters, Nitrogen

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Proceedings Article | 18 July 2016 Paper

Alignment and calibration of the ICON-FUV instrument: development of a vacuum UV facility

Richard Desselle, Yvan Stockman, Isabelle Domken, Lionel Clermont, Kodi Rider, Harald Frey, Stephen Mende, Jerome Loicq, Pascal Blain, Christian Kintziger, Etienne Renotte, Cathy Chou, Claire Poppett

Proceedings Volume 9905, 99052W (2016) https://doi.org/10.1117/12.2233192

KEYWORDS: Ultraviolet radiation, Polarization, Magnetism, Modulation, Wave plates, Sun, Rockets, CCD cameras, Astronomy, Charge-coupled devices

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Proceedings Article | 18 July 2016 Paper

Optical design and optical properties of a VUV spectrographic imager for ICON mission

Tim Miller, Cathy Chou, Thomas Immel, Harald Frey, Stephen Mende, Jerome Loicq, Christian Kintziger, Alexandra Mazzoli

Proceedings Volume 9905, 990507 (2016) https://doi.org/10.1117/12.2232588

KEYWORDS: Electrons, X-rays, Sensors, Beryllium, Spectroscopy, Silicon, Spectral resolution, Solar energy, Solar processes, X-ray characterization

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Proceedings Article | 30 January 2002 Paper

Optical design of the multi-spectral limb photometer for the WAVES explorer (NASA Midex)

Pierre Rochus, Stephen Mende, Serge Habraken, Jean-Marc Defise, Renaud Ligot, Harald Frey

Proceedings Volume 4485, (2002) https://doi.org/10.1117/12.454288

KEYWORDS: Optical filters, Image filtering, Charge-coupled devices, Spatial resolution, Imaging systems, Optical design, CCD image sensors, Stray light, Earth's atmosphere, Airglow

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The Mesosphere Lower Thermosphere (MLT) is the most inaccessible and least understood region of the Earth's atmosphere. AtmophericGravity waves play a substantial role in the dominant processes of energy and momentum transport in this region. The WAVES mission (proposed as a NASA Midex) will be the first mission dedicated to studying atmospheric gravity waves, their sources and how they affect the MLT. An instrument, the Multi-spectral Limb Photometer (MLP) will make limb viewing observations to support the WAVES mission. This instrument will observe airglow variations caused by longer wavelength waves passing through the region and will make measurements of temperature and composition in various regions in the MLT. The MLP instrument images the earth atmosphere in limb view in the orbital plane. The resolution in the vertical dimension (altitude) is about 2 km. In the horizontal dimension the MLP collects an averaged intensity over a region of 250 km in width. Vertical imaging vs. horizontal non imaging is realized by cylindrical lenses. The stray light baffling design is specially adapted to allow for day and night observation. The MLP is a single optical channel instrument using a CCD sensor. We propose to use a grille filter spectrometer consisting of a telecentric imager in which a set of narrow vertical strip interference filters are included. The image of the limb is projected onto these strip filters preserving the imaging qualities (vertical dimension). With the interference filter it is possible to realize a spectral function fitting with the multiple spectral bandpass of the emitting species. The full wavelength range is 555-892 nm where about 10 emission lines are to be resolved. The instrument sensitivity is adapted to the intensity and spectral spacing (with respect to neighboring emission lines) of each line: spatial and spectral width of each interference filter strip are independently optimized. This is unique compared to spectrograph using grating technology where spectral resolution and sensitivity are undesirably coupled through the slit width. Finally, the CCD sensor captures a composite image where columns depict the vertical limb imaging and rows indicate the spectral signature.

Proceedings Article | 22 October 1999 Paper

Optical calibration of the FUV spectrographic imager for the IMAGE mission

Joseph Stock, Steve Geller, Yvette Houbrechts, Anne Orban, Serge Habraken, Harald Frey, Marie-Laure Hellin, Etienne Renotte, Pierre Rochus, Stephen Mende

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366529

KEYWORDS: Sensors, Calibration, Monochromators, Mirrors, Imaging systems, Spectral resolution, Distortion, Optical calibration, Spatial resolution, Collimation

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Proceedings Article | 10 November 1998 Paper

Alignment and performances of the FUV Spectrographic Imager for the IMAGE mission

Yvette Houbrechts, Serge Habraken, Harald Frey, Stephen Mende, Etienne Renotte, Oswald Siegmund, Claude Jamar

Proceedings Volume 3445, (1998) https://doi.org/10.1117/12.330301

KEYWORDS: Monochromators, Mirrors, Imaging systems, Collimators, Sensors, Optical alignment, Lamps, Reflectivity, Spectral resolution, Aluminum

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Proceedings Article | 1 November 1996 Paper

CCD-camera system for stereoscopic optical observations of the aurora

Gerhard Haerendel, Werner Lieb, Herwig Hoefner, Harald Frey, Otto Bauer

Proceedings Volume 2863, (1996) https://doi.org/10.1117/12.256256

KEYWORDS: Cameras, Imaging systems, CCD cameras, Optical filters, Control systems, Auroras, Satellites, Telecommunications, Computing systems, Calibration

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Proceedings Article | 25 October 1996 Paper

Three-dimensional reconstruction of the auroral arc emission from stereoscopic optical observations

Sabine Frey, Otto Bauer, Gerhard Haerendel, Harald Frey

Proceedings Volume 2827, (1996) https://doi.org/10.1117/12.255085

KEYWORDS: Magnetism, Cameras, 3D image processing, Reconstruction algorithms, 3D image reconstruction, Auroras, Tomography, Image processing, Electrons, Rockets

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Showing 5 of 9 publications

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