Mr. Conor Ryan Profile

Conor Ryan

at German Aerospace Center (DLR)

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Author

Publications (6)

Proceedings Article | 30 August 2022 Poster + Paper

Usage of a Diffractive Optical Element (DOE) for best focal plane estimation of a camera during the integration process

Martin Pertenais, Conor Ryan, Selene Rodd-Routley, Denis Griessbach

Proceedings Volume 12188, 121883Z (2022) https://doi.org/10.1117/12.2627673

KEYWORDS: Diffractive optical elements, Cameras, Sensors, Collimation, Point spread functions, Collimators, Fiber lasers, Spectroscopy, Raman spectroscopy

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Diffractive Optical Elements (DOEs) are commonly used in the photonics community for several purposes, such as geometrical calibration of cameras,1 medical treatments, lithography, LIDAR applications. In the context of the optical alignment and integration of the RAman Spectrometer for MMX (RAX),2 a DOE was included in the test setup with the goal of providing a clear figure of merit to optimize the focusing of a dioptric lens objective on to the spectrometer detector. This Raman spectrometer will be integrated later this year in a small Rover on-board the Martian Moons eXploration (MMX) mission led by JAXA, and will operate on Phobos’ surface to characterize the different materials composing Phobos’ soil. To achieve this, the optical design of RAX is very challenging in terms of performance to reach in very limited volume and mass. As described in Ref. 2, the optical alignment and integration of RAX was a very challenging exercise, requiring several optical setups and methods. The usage of a DOE was introduced to solve a classical problem during the integration of a camera: how to integrate both the optical objective (lens assembly) and the detector to ensure that both the optical focal plane and the detector sensitive plane are co-planar. When illuminated by a collimated laser beam, the implemented DOE generates a regular pattern of collimated beams with well-known deviation angles from the input beam. It acts as a 2D diffraction grating, and generates a pattern field which covers the entire field of view of our camera. Thanks to this property, the Camera Interface Objective of RAX could be successfully positioned and oriented with respect to the detector mechanical interface. It was achieved by acquiring successive images of the DOE pattern with controlled defocused laser beam illuminating it. We were then able to compute the equivalent mechanical defocus needed to maximize the image quality. This maximizes the overall instrument performance and will ensure best possible scientific measurement on Phobos.

Proceedings Article | 29 August 2022 Paper

Characterization of coatings for straylight and photoluminescence suppression in the Raman Spectrometer for MMX (RAX)

Conor Ryan, Ute Böttger, Maximilian Buder, Yuichiro Cho, Sven Gutruf, Till Hagelschuer, Martin Pertenais, Andreas Pohl, Selene Routley, Friedrich Schrandt, Sergey G. Pavlov

Proceedings Volume 12188, 121884N (2022) https://doi.org/10.1117/12.2627219

KEYWORDS: Raman spectroscopy, Optical coatings, Spectroscopy, Reflection, Titanium, Aluminum, Oxides, Carbon, Sensors, Luminescence

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Proceedings Article | 27 August 2022 Paper

On the alignment, integration, and testing of the Raman spectrometer for MMX (RAX)

Martin Pertenais, Conor Ryan, Ute Böttger, Maximilian Buder, Yuchiro Cho, Sven Gutruf, Till Hagelschuer, Heinz-Wilhelm Hübers, Andoni Moral, Olga Prieto-Ballesteros, Steve Rockstein, Selene Rodd-Routley, Fernando Rull, Friedrich Schrandt, Susanne Schröder

Proceedings Volume 12180, 121800F (2022) https://doi.org/10.1117/12.2626701

KEYWORDS: Raman spectroscopy, Sensors, Mirrors, Spectroscopy, Collimation, Fiber lasers, Cameras, Integrated optics, Optical alignment

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Proceedings Article | 24 August 2021 Presentation + Paper

Optical test method for checking optomechanical design in early instrument models: Application to the RAX Spectrometer aboard JAXA’s MMX Mission

Conor Ryan, Martin Pertenais, Ute Böttger, Maximilian Buder, Yuichiro Cho, Heinz-Wilhelm Hübers, Till Hagelschuer, Steve Rockstein, Selene Rodd-Routley, Fernando Rull, Susanne Schröder, Friedrich Schrandt

Proceedings Volume 11820, 118200N (2021) https://doi.org/10.1117/12.2594191

KEYWORDS: Sensors, Beam splitters, Mirrors, Interfaces, Spectroscopy, Objectives, Instrument modeling, Optical components, Optomechanical design, Interferometers, Digital holography

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Proceedings Article | 20 August 2020 Presentation + Paper

The Venus Emissivity Mapper (VEM): advanced development status and performance evaluation

J. Helbert, T. Säuberlich, Melinda Darby Dyar, Conor Ryan, Ingo Walter, Jean-Michel Reess, Yaquelin Rosas-Ortiz, Gisbert Peter, Alessandro Maturilli, Gabriele Arnold

Proceedings Volume 11502, 1150208 (2020) https://doi.org/10.1117/12.2567634

KEYWORDS: Remote sensing system design, Performance modeling, Venus, Signal to noise ratio, Sensors, Optical filters, Image filtering, Bandpass filters, Linear filtering, Electrons

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Proceedings Article | 9 September 2019 Presentation + Paper

The VenSpec suite on the ESA EnVision mission to Venus

J. Helbert, A. C. Vandaele, E. Marcq, S. Robert, C. Ryan, G. Guignan, Y. Rosas-Ortiz, E. Neefs, I. Thomas, G. Arnold, G. Peter, T. Widemann, L. Lara

Proceedings Volume 11128, 1112804 (2019) https://doi.org/10.1117/12.2529248

KEYWORDS: Sensors, Venus, Spectroscopy, Clouds, Channel projecting optics, Ultraviolet radiation, Infrared spectroscopy, Optical filters, Power supplies, Mirrors

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Showing 5 of 6 publications

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