Mr. Andreas Winther Rousing Profile

Andreas Winther Rousing

at Noerrebrogade 56, 4 Tv

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Author

Publications (2)

Proceedings Article | 22 July 2016 Paper

Design and construction of a 76m long-travel laser enclosure for a space occulter testbed

Michael Galvin, Yunjong Kim, N. Jeremy Kasdin, Dan Sirbu, Robert Vanderbei, Dan Echeverri, Giuseppe Sagolla, Andreas Rousing, Kunjithapatham Balasubramanian, Daniel Ryan, Stuart Shaklan, Doug Lisman

Proceedings Volume 9912, 99126N (2016) https://doi.org/10.1117/12.2231093

KEYWORDS: Space telescopes, Cameras, Switches, Laser safety, Reflectivity, Stray light, Sensors, Telescopes, Laser systems engineering, Aluminum

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Proceedings Article | 22 July 2016 Paper

Mathematical and computational modeling of a ferrofluid deformable mirror for high-contrast imaging

Aaron Lemmer, Ian Griffiths, Tyler Groff, Andreas Rousing, N. Jeremy Kasdin

Proceedings Volume 9912, 99122K (2016) https://doi.org/10.1117/12.2233213

KEYWORDS: Actuators, Adaptive optics, Wavefronts, Coronagraphy, Electromagnetism, Deformable mirrors, Magnetism, Electroluminescent displays, Mirrors, Mathematical modeling

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Deformable mirrors (DMs) are an enabling and mission-critical technology in any coronagraphic instrument designed to directly image exoplanets. A new ferro fluid deformable mirror technology for high-contrast imaging is currently under development at Princeton, featuring a flexible optical surface manipulated by the local electromagnetic and global hydraulic actuation of a reservoir of ferro fluid. The ferro fluid DM is designed to prioritize high optical surface quality, high-precision/low-stroke actuation, and excellent low-spatial-frequency performance - capabilities that meet the unique demands of high-contrast coronagraphy in a space-based platform. To this end, the ferro-fluid medium continuously supports the DM face sheet, a configuration that eliminates actuator print-through (or, quilting) by decoupling the nominal surface figure from the geometry of the actuator array. The global pressure control allows independent focus actuation. In this paper we describe an analytical model for the quasi-static deformation response of the DM face sheet to both magnetic and pressure actuation. These modeling efforts serve to identify the key design parameters and quantify their contributions to the DM response, model the relationship between actuation commands and DM surface-profile response, and predict performance metrics such as achievable spatial resolution and stroke precision for specific actuator configurations. Our theoretical approach addresses the complexity of the boundary conditions associated with mechanical mounting of the face sheet, and makes use of asymptotic approximations by leveraging the three distinct length scales in the problem - namely, the low-stroke (~nm) actuation, face sheet thickness (~mm), and mirror diameter (cm). In addition to describing the theoretical treatment, we report the progress of computational multi physics simulations which will be useful in improving the model fidelity and in drawing conclusions to improve the design.

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