Mr. Patrice Côté Profile

Patrice Côté

at INO

SPIE Involvement:

Author

Publications (17)

Proceedings Article | 18 September 2018 Paper

A low resource imaging radiometer for nanosatellite based fire diagnosis

Linh Ngo Phong, Denis Dufour, Joshua Johnston, Claude Chevalier, Patrice Côté, Bruno Fisette, Min Wang, François Châteauneuf

Proceedings Volume 10765, 1076502 (2018) https://doi.org/10.1117/12.2320661

KEYWORDS: Sensors, Telescopes, Mid-IR, Long wavelength infrared, Cameras, Transmittance, Radiometry, Microbolometers

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Proceedings Article | 21 November 2017 Open Access

Radiometric packaging of uncooled bolometric infrared focal plane arrays

Sonia García-Blanco, Timothy Pope, Patrice Côté, Mélanie Leclerc, Linh Ngo Phong, François Châteauneuf

Proceedings Volume 10566, 105662V (2017) https://doi.org/10.1117/12.2308275

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Proceedings Article | 23 September 2015 Paper

Lens auto-centering

Frédéric Lamontagne, Nichola Desnoyers, Michel Doucet, Patrice Côté, Jonny Gauvin, Geneviève Anctil, Mathieu Tremblay

Proceedings Volume 9626, 962619 (2015) https://doi.org/10.1117/12.2196756

KEYWORDS: Optical components, Optics manufacturing, Tolerancing, Indium oxide, Optical fabrication, Manufacturing, Optical alignment, Assembly tolerances, Optical coatings, Optical mounts

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Proceedings Article | 3 September 2015 Paper

Disruptive advancement in precision lens mounting

Frédéric Lamontagne, Nichola Desnoyers, Michel Doucet, Patrice Côté, Jonny Gauvin, Geneviève Anctil

Proceedings Volume 9582, 95820D (2015) https://doi.org/10.1117/12.2196441

KEYWORDS: Tolerancing, Optics manufacturing, Manufacturing, Optical alignment, Optical mounts, Assembly tolerances, Error analysis, Optical components, Indium oxide, Spherical lenses

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Proceedings Article | 28 July 2014 Paper

POMM: design of rotating mechanism and hexapod structure

Patrice Côté, Mélanie Leclerc, Mathieu Demers, Pierre Bastien, Olivier Hernandez

Proceedings Volume 9147, 91472Q (2014) https://doi.org/10.1117/12.2056991

KEYWORDS: Computer programming, Prisms, Stars, Telescopes, Adhesives, Finite element methods, Polarization, Sensors, Interfaces, Polarimetry

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The new high precision polarimeter for the “Observatoire du Mont Mégantic” (POMM) is an instrument designed to observe exoplanets and other targets in the visible and near infrared wavebands. The requirements to achieve these observation goals are posing unusual challenges to structural and mechanical designers. In this paper, the detailed design, analysis and laboratory results of the key mechanical structure and sub-systems are presented. First, to study extremely low polarization, the birefringence effect due to stresses in the optical elements must be kept to the lowest possible values. The double-wedge Wollaston custom prism assembly that splits the incoming optical beam is made of bonded α-BBO to N-BK-7 glass lenses. Because of the large mismatch of coefficients of thermal expansion and temperatures as low as -40°C that can be encountered at Mont-Mégantic observatory, a finite element analysis (FEA) model is developed to find the best adhesive system to minimize stresses. Another critical aspect discussed in details is the implementation of the cascaded rotating elements and the twin rotating stages. Special attention is given to the drive mechanism and encoding technology. The objective was to reach high absolute positional accuracy in rotation without any mechanical backlash. As for many other instruments, mass, size and dimensional stability are important critera for the supporting structure. For a cantilevered device, such as POMM, a static hexapod is an attractive solution because of the high stiffness to weight ratio. However, the mechanical analysis revealed that the specific geometry of the dual channel optical layout also added an off-axis counterbalancing problem. To reach an X-Y displacement error on the detector smaller than 35μm for 0-45° zenith angle, further structural optimization was done using FEA. An imaging camera was placed at the detector plane during assembly to measure the actual optical beam shift under varying gravitational loading.

Proceedings Article | 28 July 2014 Paper

Optical, mechanical and electronic design and integration of POMM, a polarimeter for the Observatoire du mont Mégantic

Melanie Leclerc, Patrice Côté, François Duchesne, Pierre Bastien, Olivier Hernandez, Pierre Colonna d'Istria, Mathieu Demers, Marc Girard, Maxime Savard, Dany Lemieux, Simon Thibault, Denis Brousseau

Proceedings Volume 9147, 91472D (2014) https://doi.org/10.1117/12.2054773

KEYWORDS: Stars, Telescopes, Avalanche photodetectors, Polarization, Polarimetry, Optical amplifiers, Prisms, Mechanical engineering, Signal detection, Error analysis

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Proceedings Article | 13 September 2012 Paper

Design and test results of the calibration unit for the MOAO demonstrator RAVEN

J.-F. Lavigne, F. Lamontagne, G. Anctil, M. Wang, M. Tremblay, O. Lardière, R. Nash, D. Andersen, M. Savard, P. Côté, C. Bradley, F. Châteauneuf

Proceedings Volume 8447, 844754 (2012) https://doi.org/10.1117/12.925489

KEYWORDS: Adaptive optics, Calibration, Telescopes, Tolerancing, Zemax, Diffraction, Stars, Indium oxide, Mirrors, Relays

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Proceedings Article | 13 September 2012 Paper

Optical designs of the LGS WFS system for GMT-LTAO

Min Wang, Kristina Uhlendorf, Damien Jones, Patrice Côté, François Châteauneuf, Jonny Gauvin, Rodolphe Conan, Brady Espeland

Proceedings Volume 8447, 84473Q (2012) https://doi.org/10.1117/12.923486

KEYWORDS: Telescopes, Space telescopes, Optical design, Adaptive optics, Mirrors, Charge-coupled devices, Distortion, Wavefronts, Collimators, Optical instrument design

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Proceedings Article | 3 October 2011 Paper

Current status of the EarthCARE BBR detectors development

Martin Allard, Louis Martin, Christian Proulx, Jean-Pierre Bouchard, Patrice Côté, El-Hassane Oulachgar, John Delderfield, David Parker, François Châteauneuf

Proceedings Volume 8176, 81761E (2011) https://doi.org/10.1117/12.898990

KEYWORDS: Sensors, Staring arrays, Gold, Aluminum, Simulation of CCA and DLA aggregates, Indium oxide, Readout integrated circuits, Ultrasonics, Interfaces, Epoxies

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Proceedings Article | 24 September 2011 Paper

Thermal stress failure criteria for a structural epoxy

Patrice Côté, Nichola Desnoyers

Proceedings Volume 8125, 81250K (2011) https://doi.org/10.1117/12.893832

KEYWORDS: Epoxies, Adhesives, Temperature metrology, Failure analysis, Aluminum, Finite element methods, Data modeling, Indium oxide, Optical fabrication, Polymers

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SPIE Journal Paper | 1 November 2010

Design, manufacturing, and qualification of an uncooled microbolometer focal plane array-based radiometric package for space applications

Sonia García-Blanco, Patrice Côté, Melanie Leclerc, Nathalie Blanchard, Yan Desroches, Jean-Sol Caron, Linh Ngo Phong, François Châteauneuf, Timothy Pope

JM3, Vol. 9, Issue 04, 041105, (November 2010) https://doi.org/10.1117/12.10.1117/1.3492413

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Proceedings Article | 24 February 2010 Paper

Design and modeling of a prototype fiber scanning CARS endoscope

Israël Veilleux, Michel Doucet, Patrice Coté, Sonia Verreault, Michel Fortin, Patrick Paradis, Sébastien Leclair, Ralph Da Costa, Brian Wilson, Eric Seibel, Ozzy Mermut, Jean-François Cormier

Proceedings Volume 7558, 75580D (2010) https://doi.org/10.1117/12.842624

KEYWORDS: Tissues, Endoscopes, Optical fibers, CARS tomography, Optics manufacturing, Monte Carlo methods, Natural surfaces, Tolerancing, Head, Signal generators

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Proceedings Article | 10 September 2009 Paper

Lens barrel design of the NIRST IR Camera

Patrice Côté, Mélanie Leclerc, François Châteauneuf, Hugo Marraco

Proceedings Volume 7424, 74240E (2009) https://doi.org/10.1117/12.827069

KEYWORDS: Cameras, Long wavelength infrared, Infrared cameras, Mid-IR, Finite element methods, Lens design, Tolerancing, Objectives, Infrared imaging, Liquids

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Proceedings Article | 2 September 2009 Paper

Performances of the SAC-D NIRST flight model radiometer

Mélanie Leclerc, Linda Marchese, Patrice Côté, François Châteauneuf, Claude Chevalier, Hugo Marraco, Linh Ngo Phong

Proceedings Volume 7453, 745308 (2009) https://doi.org/10.1117/12.828044

KEYWORDS: Cameras, Mid-IR, Microbolometers, Temperature metrology, Sensors, Staring arrays, Long wavelength infrared, Manufacturing, Finite element methods, Indium oxide

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Proceedings Article | 2 September 2009 Paper

The EarthCARE broadband radiometer detectors

Christian Proulx, Fraser Williamson, Martin Allard, Georges Baldenberger, David Gay, Sonia Garcia-Blanco, Patrice Côté, Louis Martin, Carl Larouche, Samir Ilias, Tim Pope, Martin Caldwell, Kim Ward, John Delderfield

Proceedings Volume 7453, 74530S (2009) https://doi.org/10.1117/12.829935

KEYWORDS: Sensors, Staring arrays, Indium oxide, Readout integrated circuits, Gold, Prototyping, Reflectivity, Radiometry, Electronics, Simulation of CCA and DLA aggregates

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Proceedings Article | 10 February 2009 Paper

Radiometric packaging of uncooled microbolometer FPA arrays for space applications

S. García-Blanco, P. Cote, M. Leclerc, N. Blanchard, Y. Desroches, J.-S. Caron, L. Ngo Phong, F. Chateauneuf, T. Pope

Proceedings Volume 7206, 720604 (2009) https://doi.org/10.1117/12.810025

KEYWORDS: Sensors, Copper, Temperature metrology, Aluminum, Stray light, Staring arrays, Indium oxide, Microbolometers, Radiation effects, Long wavelength infrared

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INO has extensive experience in the design and fabrication of focal plane arrays (FPAs) of uncooled microbolometers. In particular, the FPA of 512×3 microbolometers, developed in collaboration with the Canadian Space Agency (CSA), has been selected for use in the NIRST (New Infrared Sensor Technology) radiometer of the SAC-D Aquarius mission. The FPA has been designed for pushbroom scanning of the Earth to provide radiometric data in the mid- and long-wave infrared for the monitoring of fires as well as thermal mapping of ocean temperature. Uncooled microbolometer detectors are suited for space applications due to their low power consumption while still exhibiting adequate performance. Furthermore, the spectral range of their response could be tuned from the mid- to the far-infrared to meet different mission requirements. In order to ensure that the detector receives only the thermal contribution from the desired target and to minimize radiometric error due to variation of the temperature of the surrounding during the measurements, a radiometric package is required. In a radiometric package the detector environment is thermally stabilized by means of a temperature controlled radiation shield. The radiation shield should also be designed to prevent stray radiation from reaching the detector. Under the Space Technology Development Program of the CSA, INO has designed, assembled and tested a radiometric package in order to characterize its performance and compatibility with the space environment. The operating spectral band is defined by the spectral characteristics of a bandpass filter placed in front of the FPA. For typical space missions, the package must pass standard environmental tests without degradation of its performance (thermal cycling from -55 to +85 °C according to MIL-STD-810, random acceleration up to 14 G RMS from 20-2000 Hz and shock up to 75 G). In order to ensure reliability in those conditions while maintaining optimum performance, an adequate selection of materials is necessary. In this paper, INO's radiometric packaging technology for uncooled microbolometer FPA's will be presented. The selection of materials will be discussed and the final choices presented based on thermal simulations and experimental data. The effects of different design parameters on the performance, such as material, shape and thickness of radiation shield and choice of adhesive have been studied. An instantaneous noise equivalent temperature difference (NETD) of ~ 20 mK was obtained under the measurement conditions (broadband LWIR, 140 ms integration time, f/1 optics, characterization in flood exposure). The design of the package reduced the contribution of environmental temperature variations on the offset of the sensor. The equivalent response of the package varied less than 0.08 °C per degree of variation of the temperature of the package. The package also showed low sensitivity to stray radiation as a result of the effectiveness of the radiation shield design. The device successfully passed the prescribed environmental tests without degradation of performance.

Proceedings Article | 29 June 2006 Paper

Optics integration of the OMM wide-field visible camera (Panoramix-II)

S. Thibault, M. Wang, P. Côté, L. Drissen, Elaine Brière

Proceedings Volume 6269, 626928 (2006) https://doi.org/10.1117/12.671293

KEYWORDS: Cameras, Imaging systems, Telescopes, Sensors, Image quality, Optical filters, Optical design, Image filtering, Stars, Visible radiation

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Showing 5 of 17 publications

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