Mr. Mathieu Demers Profile

Mathieu Demers

at OMP Inc

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 30 August 2022 Presentation + Paper

Deployment of focal plane WFS technologies on 8-m telescopes: from the Subaru SPIDERS pathfinder, to the facility-class GPI 2.0 CAL2 system

Christian Marois, Olivier Lardière, William Thompson, Garima Singh, Adam Johnson, Tim Hardy, Joeleff Fitzsimmons, Benjamin Gerard, Suresh Sivanandam, Simon Thibault, Dmitry Savransky, Colin Bradley, Rebecca Jensen-Clem, Mathieu Demers, Qiang Fu, Wolfgang Heidrich, Mamadou N'Diaye

Proceedings Volume 12185, 121851Y (2022) https://doi.org/10.1117/12.2630564

KEYWORDS: Telescopes, Exoplanets, Wavefront sensors, Stars, Wavefronts, Gemini Planet Imager, Speckle, Imaging systems, Cameras, Adaptive optics

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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 | 9 September 2010 Paper

Review of a high resolution catadioptric optical module

Nathalie Blanchard, Nichola Desnoyers, Anne Martel, Mathieu Demers, Maxime Savard, Bruno Tremblay, Loïc Le Noc, Claude Chevalier, Alain Bergeron

Proceedings Volume 7652, 76522H (2010) https://doi.org/10.1117/12.868853

KEYWORDS: Mirrors, Combined lens-mirror systems, Sensors, Optical alignment, Cameras, Indium oxide, Optical resolution, Spatial resolution, Optical components, Integrated optics

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Proceedings Article | 4 May 2010 Paper

1280 x 960 pixel microscanned infrared imaging module

Loïc Le Noc, Bruno Tremblay, Anne Martel, Claude Chevalier, Nathalie Blanchard, Martin Morissette, Luc Mercier, François Duchesne, Lucie Gagnon, Patrick Couture, Frédéric Lévesque, Nichola Desnoyers, Mathieu Demers, Frédéric Lamontage, Hubert Jerominek, Alain Bergeron

Proceedings Volume 7660, 766021 (2010) https://doi.org/10.1117/12.853377

KEYWORDS: Sensors, Prototyping, Image resolution, Infrared imaging, Spatial resolution, Indium oxide, Thermography, Imaging systems, Combined lens-mirror systems, Infrared detectors

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