Mr. Guillaume Girard Profile

Guillaume Girard

at ABB Analytical Measurement

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Publications (4)

Proceedings Article | 17 November 2017 Open Access

HVRM: a second generation ACE-FTS instrument concept

Jean-François Lavigne, Martin Larouche, Fabien Dupont, Guillaume Girard, James Veilleux, Henry Buijs, Raphaël Desbiens, Gaétan Perron, Frédéric Grandmont, Simon Paradis, Louis Moreau, Hugo Bourque

Proceedings Volume 10563, 1056345 (2017) https://doi.org/10.1117/12.2304247

KEYWORDS: Sun, Mirrors, Clouds, Sensors, Astronomical imaging, Interferometers, Image filtering, Imaging systems, Finite element methods, Earth's atmosphere

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The Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) is the main instrument on-board the SCISAT-1 satellite, a mission mainly supported by the Canadian Space Agency [1]. It is in Low- Earth Orbit at an altitude of 650 km with an inclination of 74E. Its data has been used to track the vertical profile of more than 30 atmospheric species in the high troposphere and in the stratosphere with the main goal of providing crucial information for the comprehension of chemical and physical processes controlling the ozone life cycle. These atmospheric species are detected using high-resolution (0.02 cm^-1) spectra in the 750-4400 cm^-1 spectral region. This leads to more than 170 000 spectral channels being acquired in the IR every two seconds. It also measures aerosols and clouds to reduce the uncertainty in their effects on the global energy balance. It is currently the only instrument providing such in-orbit high resolution measurements of the atmospheric chemistry and is often used by international scientists as a unique data set for climate understanding.

The satellite is in operation since 2003, exceeding its initially planned lifetime of 2 years by more than a factor of 5. Given its success, its usefulness and the uniqueness of the data it provides, the Canadian Space Agency has founded the development of technologies enabling the second generation of ACE-FTS instruments through the High Vertical Resolution Measurement (HVRM) project but is still waiting for the funding for a mission.

This project addresses three major improvements over the ACE-FTS. The first one aims at improving the vertical instantaneous field-of-view (iFoV) from 4.0 km to 1.5 km without affecting the SNR and temporal precision. The second aims at providing precise knowledge on the tangent height of the limb observation from an external method instead of that used in SCISAT-1 where the altitude is typically inferred from the monotonic CO2 concentration seen in the spectra. The last item pertains to reaching lower altitude down to 5 km for the retrieved gas species, an altitude at which the spectra are very crowded in terms of absorption. These objectives are attained through a series of modification in the optical train such as the inclusion of a field converter and a series of dedicated real-time and post-acquisition algorithms processing the Sun images as it hides behind the Earth. This paper presents the concepts, the prototypes that were made, their tests and the results obtained in this Technology Readiness Level (TRL) improvement project.

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Proceedings Article | 13 October 2010 Paper

Technological evolutions on the FTS instrument for follow-on missions to SCISAT Atmospheric Chemistry Experiment

Jacques Giroux, Louis Moreau, Guillaume Girard, Marc-André Soucy

Proceedings Volume 7826, 78261A (2010) https://doi.org/10.1117/12.865855

KEYWORDS: Fourier transforms, Spectroscopy, Interferometers, Satellites, Mars, Imaging systems, Sun, Ozone, Atmospheric chemistry, Earth's atmosphere

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Proceedings Article | 14 October 2005 Paper

Optimizing energy deposition on corneal stroma for an application in laser femtosurgery

D. Giguère, G. Olivié, S. Toetsch, G. Girard, F. Vidal, I. Brunette, T. Ozaki, J.-C. Kieffer

Proceedings Volume 5969, 59691Z (2005) https://doi.org/10.1117/12.629363

KEYWORDS: Laser ablation, Femtosecond phenomena, Cornea, Laser damage threshold, Silica, Pulsed laser operation, Picosecond phenomena, Surgery, Laser vision correction, Eye

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Proceedings Article | 9 December 2004 Paper

Investigation of ultrashort pulse laser ablation of the cornea and hydrogels for eye microsurgery

Guillaume Girard, Sheng Zhou, Nicolas Bigaouette, Isabelle Brunette, Mohamed Chaker, Lucie Germain, Pierre-Luc Lavertu, Francois Martin, Gilles Olivie, Tsuneyuki Ozaki, Mireille Parent, Francois Vidal, Jean-Claude Kieffer

Proceedings Volume 5578, (2004) https://doi.org/10.1117/12.567111

KEYWORDS: Laser ablation, Electrons, Cornea, Laser damage threshold, Laser energy, Pulsed laser operation, Absorption, Ultrafast phenomena, Eye, Microsurgery

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