Patrick Beaupré
Institut National d'Optique
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Publication
Featured researches published by Patrick Beaupré.
photonics north | 2010
Samir Ilias; Patrice Topart; Carl Larouche; Patrick Beaupré; Christian Proulx; Timothy D. Pope; Christine Alain
High absorptivity and low thermal mass are two important requirements for coatings applied to thermal infrared detectors. Gold black coatings are very good candidates to ensure these characteristics in the broadband infrared spectral range. A specific deposition system was designed and built at INO in order to provide gold-black coatings for different broadband detection applications including the broadband radiometer (BBR) instrument for the European Space Agency (ESA) EarthCARE satellite. A parametric study targeting uniform optical absorptance within the spectral range from 0.2 μm to 50 μm was conducted. Specular reflectance lower than 10% was obtained for extended wavelength range up to 100 μm. The coating thickness ranges typically between 20 μm and 35 μm, with uniformity of about ± 3 μm over a sample surface of 10x10 mm2. The deposit density was typically ~0.3% of the bulk density of gold. To singulate the blackened infrared detector pixels, a laser micromachining process was developed. The setup exhibits a 1μm positioning accuracy and allows for ablation of 3 μm to 12 μm wide channels through the gold-black thickness, while preserving the pixel and gold-black deposit integrity.
Scientific Reports | 2018
Martin Bolduc; Charles Trudeau; Patrick Beaupré; Sylvain G. Cloutier; P. Galarneau
In recent years, additive manufacturing has been evolving towards flexible substrates for the fabrication of printable electronic devices and circuits. Generally polymer-based, these emerging substrates suffer from their heat sensitivity and low glass-transition temperatures. As such they require new highly-localized sintering processes to treat the electronic inks without damaging the polymer-based substrate. Laser-based sintering techniques have shown great promises to achieve high-quality sintering locally, while controlling the heat penetration to preserve the polymer substrates integrity. In this report, we explore new optimization pathways for dynamic laser-based sintering of conductive silver inks. Multiple passes of a pulsed laser are first performed while varying pulse train frequencies and pulse energies as an attempt to optimize the properties of the silver inks. Then, time-domain pulse shaping is performed to alter the properties of the conductive inks. Together, these pathways allow for the careful control of the time-domain laser energy distribution in order to achieve the best electronic performances while preserving the substrate’s integrity. Sheet resistance values as low as 0.024Ω/□ are achieved, which is comparable to conventional 1-hour oven annealing, with the processing time dramatically reduced to the milisecond range. These results are supported by finite element modeling of the laser-induced thermal dynamics.
Proceedings of SPIE | 2017
Bruno Fisette; Mathieu Tremblay; Hassane Oulachgar; Francis Généreux; David Béland; Patrick Beaupré; Christian Julien; Sébastien Deshaies; Marc Terroux; Bruno Tremblay; Denis Dufour; Christine Alain
This paper reports on the development of a fully packaged focal plane array of broadband microbolometers. The detector makes use of a gold black thin film to expand its absorption range from 3 to 14 μm. A low temperature packaging process was developed to minimize sintering of the gold black absorber during vacuum sealing of the bolometer array package. The gold black absorber was also laser trimmed to prevent lateral diffusion of heat and promote a better MTF. The resulting FPAs show a NETD lower than 25 mK at a frame rate of 50 Hz
International Conference on Space Optics — ICSO 2014 | 2017
Jacques-Edmond Paultre; Patrick Beaupré; Marc Terroux; Linda Marchese; Martin Bolduc; Luc Mercier; Claude Chevalier; Lucie Gagnon; Bruno Tremblay; Francis Généreux; Francis Provençal; Yan Desroches; François Châteauneuf; Alain Bergeron; Bruno Cugny; Zoran Sodnik; Nikos Karafolas
In the past, bolometer-based imagers have been used for earth observation. Uncooled-bolometer based imagers are especially well suited for this due to their low power consumption. NIRST (New Infra-Red Sensor Technology), an example of an imager based on uncooled bolometers, monitors high temperature events on the ground related to fires and volcanic events, and will measure their physical parameters and takes measurements of sea surface temperatures mainly off the coast of South America as well as other targeted opportunities. NIRST has one band in the mid-wave infrared centered at 3.8 um with a bandwidth of 0.8 um, and two bands in the thermal infrared, centered respectively at 10.85 and 11.85 um with a bandwidth of 0.9 um.
Journal of Infrared, Millimeter, and Terahertz Waves | 2015
Denis Dufour; Linda Marchese; Marc Terroux; Hassane Oulachgar; Francis Généreux; Michel Doucet; Luc Mercier; Bruno Tremblay; Christine Alain; Patrick Beaupré; Nathalie Blanchard; Martin Bolduc; Claude Chevalier; Dominic D’Amato; Yan Desroches; François Duchesne; Lucie Gagnon; Samir Ilias; Hubert Jerominek; François Lagacé; Julie Lambert; Frédéric Lamontagne; Loïc Le Noc; Anne Martel; Ovidiu Pancrati; Jacques-Edmond Paultre; Tim Pope; Francis Provençal; Patrice Topart; Carl Vachon
MRS Advances | 2017
Charles Trudeau; Martin Bolduc; Patrick Beaupré; Patrice Topart; Christine Alain; Sylvain G. Cloutier
MRS Advances | 2016
Hassane Oulachgar; Martin Bolduc; Gregory Chauve; Yan Desroches; Patrick Beaupré; Jean Bouchard; Pierre Galarneau
international conference on infrared, millimeter, and terahertz waves | 2015
Luc Mercier; Bruno Fisette; Marc Terroux; Yan Desroches; Patrick Beaupré; Mathieu Demers; Denis Dufour; Francis Généreux; Linda Marchese; Patrice Topart; Christine Alain; Alain Bergeron
international conference on infrared, millimeter, and terahertz waves | 2014
Hassane Oulachgar; Jacques-Edmond Paultre; Francis Provençal; D. D'Amato; Patrick Beaupré; Christine Alain; Hubert Jerominek
photonics north | 2010
Sonia M. García-Blanco; Samir Ilias; Fraser Williamson; Francis Généreux; Loïc Le Noc; Michel Poirier; Christian Proulx; Bruno Tremblay; Francis Provençal; Yan Desroches; Jean-Sol Caron; Carl Larouche; Patrick Beaupré; Benoit Fortin; Patrice Topart; Francis Picard; Christine Alain; Timothy D. Pope; Hubert Jerominek