Mr. Bruno Leduc Profile

Bruno Leduc

at INO

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Author

Publications (3)

Proceedings Article | 28 September 2023 Presentation + Paper

Optomechanical mounts for high stability in harsh environmental conditions

Nichola Desnoyers, Frederic Lamontagne, Martin Grenier, Mathieu Legros, Simon Paradis, Mathieu Tremblay, Bruno Leduc

Proceedings Volume 12669, 126690B (2023) https://doi.org/10.1117/12.2676441

KEYWORDS: Mirror mounts, Mirrors, Breadboards, Temperature metrology, Thermal stability, Prototyping, Design and modelling, Optical mounts, Optomechanical components, Precision lens assemblies

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SPIE Journal Paper | 24 March 2021 Open Access

Methods to achieve fast, accurate, and mechanically robust optical breadboard alignment

Martin Grenier, Nichola Desnoyers, Frederic Lamontagne, Bruno Leduc, Mathieu Legros, Simon Paradis

OE, Vol. 60, Issue 05, 051213, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.5.051213

KEYWORDS: Optical spheres, Optical alignment, Optical components, Mirrors, Sensors, Optical engineering, Interfaces, Optical testing, Mirror mounts, Error analysis

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Typical laboratory optical systems use commercially off-the-shelf components in which emphasis is oriented toward ease of assembly and a wide range of adjustability. However, these mounts often require individual alignments that, when each degree of adjustability is cumulated in a complex optical system, can be inefficient and time consuming. Furthermore, most of these optomechanical mounts lack the mechanical robustness required to maintain operational performances out of the laboratory environment. An optomechanical assembly method based on passively aligning design features is proposed to simplify breadboard level optical systems, to improve alignment accuracy and maintaining operational pointing stability. Given the recent improvements in lens passive centering techniques, it seemed worth exploring methods to reduce alignment time and improve the mechanical robustness of laboratory setups. Recent studies show that a typical optical lens centering of <1 arc min with respect to its mount can be achieved using patented auto centering and edge contact mounting technologies. To achieve similar position accuracy between multiple lenses on a portable breadboard, lens mounts should be designed and built with proper reference surfaces and a system should easily reference one mount with respect to the other. The use of reference spheres and dedicated optomechanical mounts is employed to leverage the standard threaded holes of laboratory breadboards and achieve precise lens mount positioning. A series of optomechanical mounts incorporating these techniques are therefore tested. Position accuracy and repeatability are measured mechanically with a coordinate measuring machine and optically with the active monitoring of a laser beam centroid position. Measured position accuracy at the optomechanical mount level is <50 μm with a repeatability of less than 5 μm per interface. The optomechanical mounts robustness is tested within typical storage temperature range of −46 ° C to 63°C and at vibrations levels exceeding typical shipping conditions. Measured optical pointing stability of a simple optical system after environmental testing was found to be under 25 μm. This method should be a promising solution to bridge the design technological gap between the early prototyping and the production phases.

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Proceedings Article | 5 September 2017 Presentation + Paper

Dimensional stability performance of a CFRP sandwich optical bench for microsatellite payload

N. Desnoyers, P. Goyette, B. Leduc, M.-A. Boucher

Proceedings Volume 10372, 103720G (2017) https://doi.org/10.1117/12.2274311

KEYWORDS: Space telescopes, Telescopes, Optical benches, Carbon, Optomechanical design, Electronic components, Fiber reinforced polymers, Structural design, Optical mounts

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