Prof. Pierre Bastien Profile

Prof. Pierre Bastien

at Univ de Montréal

SPIE Involvement:

Author

Publications (8)

Proceedings Article | 19 July 2016 Paper

POL-2: a polarimeter for the James-Clerk-Maxwell telescope

Per Friberg, Pierre Bastien, David Berry, Giorgio Savini, Sarah Graves, Kate Pattle

Proceedings Volume 9914, 991403 (2016) https://doi.org/10.1117/12.2231943

KEYWORDS: Polarimetry, Polarization, Telescopes, Wave plates, Modulation, Bolometers, Astronomy, Space telescopes, Calibration, Uranus

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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 | 8 July 2014 Paper

High-precision polarimetry at the Mont-Mégantic Observatory with the new polarimeter POMM

Pierre Bastien, Olivier Hernandez, Loïc Albert, Étienne Artigau, René Doyon, Laurent Drissen, David Lafrenière, Antony Moffat, Nicole St-Louis

Proceedings Volume 9147, 91471S (2014) https://doi.org/10.1117/12.2056789

KEYWORDS: Stars, Polarization, Polarimetry, Planets, Light scattering, Exoplanets, Scattering, Jupiter, Comets, Observatories

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Proceedings Article | 26 September 2007 Paper

Optomechanical design for the SCUBA-2 polarimeter

Sophie Bernier, Pierre Bastien, Mélanie Leclerc, Éric Bissonnette

Proceedings Volume 6665, 66650T (2007) https://doi.org/10.1117/12.732643

KEYWORDS: Polarimetry, Wave plates, Optical components, Space telescopes, Cameras, Telescopes, Calibration, Polarizers, Optomechanical design, Computer programming

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Proceedings Article | 18 July 2006 Paper

The SCUBA-2 polarimeter

Mélanie Leclerc, Pierre Bastien, Sophie Bernier, Eric Bissonnette, P. Ade, Giampaolo Pisano, Giorgio Savini

Proceedings Volume 6342, 63421O (2006) https://doi.org/10.1117/12.692309

KEYWORDS: Wave plates, Polarimetry, Telescopes, Polarizers, Cameras, Polarization, Optical components, Calibration, Sensors, Mirrors

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Proceedings Article | 8 October 2004 Paper

An update on the SCUBA-2 project

Michael Audley, Wayne Holland, Trevor Hodson, Michael MacIntosh, Ian Robson, Kent Irwin, Gene Hilton, William Duncan, Carl Reintsema, Anthony Walton, William Parkes, Peter Ade, Ian Walker, Mike Fich, Jan Kycia, Mark Halpern, David Naylor, George Mitchell, Pierre Bastien

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.551259

KEYWORDS: Sensors, Semiconducting wafers, Multiplexers, Magnetism, Bolometers, Silicon, Prototyping, Telescopes, Superconductors, Niobium

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