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检索条件"任意字段=Conference on Computational Optics Held as Part of Part of SPIE Optical Systems Design Conference"

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Hands-on project aimed at technical education - realizing a dc magnetron sputtering system 24

Hands-on project aimed at technical education - realizing a ...

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conference on Novel optical systems, Methods, and Applications XXIV part of spie optical Engineering + Applications conference

作者： Massahi, S. Ferreira, D. D. M. Avngaard, Michael H. Christensen, A. B. Haugbolle, D. T. Jensen, K. W. Mejnertz, I. F. Selsner, J. S. Westermann, M. J. Fleron, R. Christensen, F. E. Gellert, N. Svendsen, S. Henriksen, P. L. Jegers, A. S. Tech Univ Denmark DTU Space Elektrovej Bldg 327-328 DK-2800 Lyngby Denmark

ISBN: (数字)9781510644694

ISBN: (纸本)9781510644694;9781510644687

We present a teaching concept which combines theory, experimental work, project management and organization. As part of the Earth and Space Physics and Engineering education at DTU Space, a group of first year undergraduate students were given the task to design, build and test a DC magnetron sputtering system within a very limited budget and time frame. The teaching concept is designed to promote the students' autonomous learning, and a major part of the project was to teach the students how to develop group dynamics successfully. The students successfully managed to build a direct current magnetron sputtering system wherein a plasma glow was produced. The system can be used for depositing thin film coatings, an enabling technology for numerous applications.

关键词： dc magnetron sputtering X-ray optics DTU Space Teaching Engineering work

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First lab results of segment/petal phasing with a pyramid wavefront sensor and a novel holographic dispersed fringe sensor (HDFS) from the Giant Magellan Telescope high contrast adaptive optics phasing testbed 8

First lab results of segment/petal phasing with a pyramid wa...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Hedglen, Alexander D. Close, Laird M. Haffert, Sebastiaan Y. Males, Jared R. Kautz, Maggie Bouchez, Antonin H. Demers, Richard Quiros-Pacheco, Fernando Sitarski, Breann N. Guyon, Olivier Van Gorkom, Kyle Long, Joseph D. Lumbres, Jennifer Schatz, Lauren Miller, Kelsey Rodack, Alex Knight, Justin M. Univ Arizona Steward Observ Tucson AZ 85721 USA Univ Arizona Coll Opt Sci Tucson AZ 85721 USA GMTO Corp Pasadena CA USA Subaru Telescope Natl Astron Observ Japan Hilo HI USA Natl Inst Nat Sci Astrobiol Ctr Tokyo Japan Air Force Res Lab Kirtland AFB Albuquerque NM USA

ISBN: (纸本)9781510653528;9781510653511

The Giant Magellan Telescope (GMT) design consists of seven circular 8.4-m diameter mirror segments that are separated by large > 30 cm gaps, making them susceptible to fluctuations in optical path differences (piston) due to flexure, segment vibrations, wind buffeting, temperature effects, and atmospheric seeing. If we wish to utilize the full 25.4-m diffraction-limited aperture of the GMT for high-contrast natural guide star adaptive optics (NGSAO) science (e.g., direct imaging of habitable zone earth-like planets around late type stars), the seven mirror segments must be co-phased to well within a fraction of a wavelength. The current design of the GMT involves seven adaptive secondary mirrors, a dispersed fringe sensor, and a pyramid wavefront sensor (PyWFS) to measure and correct the total path length between segment pairs, but these methods need to be tested "end-to-end" in a lab environment if we hope to officially retire the GMT high risk item of phasing performance. We present the design and working prototype of a "GMT High-Contrast Adaptive optics phasing Testbed" (p-HCAT) which leverages the existing MagAO-X ExAO instrument to demonstrate segment phase sensing and simultaneous AO-control for high-contrast GMT NGSAO science. We present the first test results of closed-loop piston control with one GMT segment using MagAO-X's PyWFS and a novel Holographic Dispersed Fringe Sensor (HDFS) with and without simulated atmospheric turbulence. We show that the PyWFS alone was able to successfully control piston without turbulence within 12-33 nm RMS for 0 lambda/D - 5 lambda/D modulation, but was unsuccessful at controlling segmented piston with generated similar to 0.6 arcsec and similar to 1.2 arcsec seeing turbulence due to non-linear modal cross-talk and poor pixel sampling of the segment gaps on the PyWFS detector. We report the success of an alternate solution to control segmented piston using the novel HDFS while controlling all other modes with the PyWFS pur

关键词： phasing testbed GMT piston adaptive optics high-contrast

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All reflective THz telescope design with an inflatable primary antenna for Orbiting Astronomical Satellite for Investigating Stellar systems (OASIS) mission 3

All reflective THz telescope design with an inflatable prima...

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conference on Astronomical optics - design, Manufacture, and Test of Space and Ground systems III

作者： Takashima, Yuzuru Sirsi, Siddhartha Choi, Heejoo Palisoc, Art Arenberg, Jonathan W. Kim, Daewook Walker, Christopher Univ Arizona Wyant Coll Opt Sci 1630 E Univ Blvd Tucson AZ 85721 USA Univ Arizona Large Binocular Telescope Observ 933 N Cherry Ave Tucson AZ 85721 USA Univ Arizona Dept Astron & Steward Observ 933 N Cherry Ave Tucson AZ 85721 USA LGarde Inc 15181 Woodlawn Ave Tustin CA 92780 USA Northrop Grumman Aerosp Syst 1 Space Pk Blvd Redondo Beach CA 90278 USA

ISBN: (数字)9781510644793

ISBN: (纸本)9781510644793

With an inflatable membrane, a space antenna having an order of magnitude larger photon collection area as compared to the state of the art is feasible. An integrated and comprehensive study has been performed by the scientists and engineers team at NASA Goddard, Northrup Grumman, L'Garde and University of Arizona. As a part of the study, optical design for the 19m antenna is overviewed here.

关键词： Teraheltz astronomy space antenna inflatable primary mirror Hencky surface

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Integrated design of Optimisation and Inverse Dynamics Control for Home Heating systems

Integrated Design of Optimisation and Inverse Dynamics Contr...

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International conference on Control, Decision and Information Technologies (CoDIT)

作者： C. P. D. Downing J. M. Counsell School of Computational and Engineering Sciences University of Chester Chester United Kingdom

ISBN: (数字)9798350373974

ISBN: (纸本)9798350373981

This paper presents a novel controller design methodology for multi-input multi-output linear time invariant systems using a realisable system’s inverse dynamics whilst simultaneously aiming to optimize the systems performance. This is very useful for energy system type controller design problems, especially heating systems as described in this paper. The new methodology, OPTimal Inverse Control (OPTIC) integrates the challenge to minimize a cost function and introduce it into the feedback control solution, thus allowing for simultaneous fast acting stable and non-interacting feedback control with cost function minimisation to provide a robust and optimal solution. The cost function presented acts to minimise weighted proportions of Carbon Intensity (c I ) of the energy supply system and the Cost of the Tariff (c Tar ) depending on the policy weighing potential fuel poverty against net zero carbon heating solutions. It is described how the OPTIC method is applied to a heating system control problem using a home heating dynamic model Inverse Dynamics based Energy Assessment and Simulation (IDEAS). IDEAS calibrated with UK’s part L building regulations models a home’s building physics, heating demand using a standard type of occupancy over a whole year. This allows the OPTIC method to control the heating system to reach the required home comfort whilst continuously heading towards the minimum cost function value at all times, minute by minute instead of a much slower period of optimisation that is achieved by other complementary methods, like General Predictive Control (GPC).

关键词： Heating systems Integrated optics optical feedback Tariffs Cost function Adaptive optics optical pumping Feedback control Thermal stability optical control

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A computational framework for multiphysics and multiscale modeling of laser interactions with biological tissue

A computational framework for multiphysics and multiscale mo...

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Bio-optics: design and Application, BODA 2021 - part of Biophotonics Congress: optics in the Life Sciences 2021

作者： Chimakurthi, Satish Nucci, Michael Blades, Eric Jacques, Steven L. London, Richard A. Wharmby, Andrew ATA Engineering Inc. HerndonVA20171 United States ATA Engineering Inc. San DiegoCA92128 United States ATA Engineering Inc. HuntsvilleAL35806 United States Department of Bioengineering University of Washington SeattleWA98195 United States Design Physics Division Lawrence Livermore National Lab LivermoreCA94550 United States Research Biomedical Engineer 711th Human Performance Wing Airman Systems Directorate Bioeffects Division Optical Radiation Branch 4141 Petroleum Rd. JBSA Fort Sam HoustonTX78234 United States Research Biomedical Engineer 711th Human Performance Wing Airman Systems Directorate Bioeffects Division Optical Radiation Branch 4141 Petroleum Rd. JBSA San AntonioTX78234 United States

ISBN: (纸本)9781557528209

This paper summarizes the concept design of a versatile computational multiphysics framework that supports modeling and simulation of a variety of laser-tissue interaction mechanisms. A sample result from a preliminary verification study is presented. Comments and questions should be directed to Dr. Satish Chimakurthi. © 2021 The Author (s).

关键词： Tissue

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Physics-based learned design for Fourier DiffuserScope

Physics-based learned design for Fourier DiffuserScope

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computational optical Sensing and Imaging, COSI 2021 - part of OSA Imaging and Applied optics Congress 2021

作者： Markley, Eric Liu, Fanglin Linda Kellman, Michael Antipa, Nick Waller, Laura UCB/UCSF Joint Graduate Program in Bioengineering University of California Berkeley United States Department of Electrical Engineering and Computer Sciences University of California Berkeley United States Department of Pharmaceutical Chemistry University of California San Francisco United States Department of Electrical and Computer Engineering University of California San Diego United States

We couple a differentiable forward model of diffuser-based single-shot 3D microscopy (Fourier DiffuserScope) with an invertible and differentiable reconstruction algorithm to jointly optimize the imaging system and th... 详细信息

ISBN: (纸本)9781557528209

关键词： Imaging systems

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Classical fundamental limits in phase microscopy

Classical fundamental limits in phase microscopy

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Bio-optics: design and Application, BODA 2021 - part of Biophotonics Congress: optics in the Life Sciences 2021

作者： Maestre, Dante Bouchet, Dorian Dong, Jonathan Juffmann, Thomas University of Vienna Faculty of Physics VCQ ViennaA-1090 Austria University of Vienna Max Perutz Laboratories Department of Structural and Computational Biology ViennaA-1030 Austria Debye Institute for Nanomaterials Science and Center for Extreme Matter and Emergent Phenomena Utrecht University P.O. Box 80000 TA Utrecht3508 Netherlands Laboratoire Kastler Brossel Ecole Normale Supérieure Université PSL CNRS Sorbonne Université Collège de France ParisF-75005 France

In our work, we show how the Cramér-Rao bound is calculated for any linear optical system and we demonstrate how this general framework can be applied for the design and optimization of classical phase microscope... 详细信息

ISBN: (纸本)9781557528209

关键词： optical systems

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Bridging the gap from Academia to Application: Rapid Algorithm design & Deployment for Artificial Intelligence (RADD-AI) 3

Bridging the gap from Academia to Application: Rapid Algorit...

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conference on Artificial Intelligence and Machine Learning in Defense Applications III held as part of spie Security+Defence conference

作者： Haley, Joshua Tucker, Jonathan Kessler, Brandon Fish, Trisha Elbit Syst Amer Adv Capabil Ctr 12600 Challenger Pkwy Orlando FL 32826 USA

ISBN: (纸本)9781510645851;9781510645844

Machine Learning (ML) and Artificial intelligence (AI) have led to an increase in automation potential within defense applications such as border protection, compound security, and surveillance applications. Recent academic advances in deep learning aided computer vision have yielded impressive results on object detection, and recognition, necessary capabilities to increase automation in defense applications. These advances are often open-sourced, enabling the opportunistic integration of state-of-the-art (SOTA) algorithms into real systems. However, these academic achievements do not translate easily to engineered systems. Academics often are looking at a single capability with metrics such as accuracy or F1 score without consideration of system-level performance and how these algorithms must integrate or what level of computational performance is required. An engineered system is developed as a system of algorithms that must work in conjunction with each other with deployment constraints. This paper describes a system, called Rapid Algorithm design & Deployment for Artificial Intelligence (RADD-AI (TM)), developed to enable the rapid development of systems of algorithms incorporating these advances in a modular fashion using networked Application Programming Interfaces (APIs). The inherent modularity mitigates the assumption of monolithic integration within a single ecosystem that creates vendor lock. This monolith assumption does not account for the reality that frameworks are usually targeted toward different types of problems and learning vs inference capabilities. RADD-AI makes no such assumption. If a different framework solves subsets of the system more eloquently, they can be integrated into the larger pipeline. RADD-AI enables the integration of state-of-the-art ML into deployed systems while also supporting the necessary ML engineering tasks, such as transfer learning, to operationalize academic achievements. To motivate how RADD-AI enables applications o

关键词： Applied Machine Learning Deep Learning Surveillance Border Protection

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A simple collimator design for measuring focal spots with high dynamical range 7

A simple collimator design for measuring focal spots with hi...

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conference on optical Fabrication, Testing, and Metrology VII

作者： Le Garrec, B. Chabanis, M. Tinker, F. Uwakwe, M. Lasyex Sro Rorysova 2195-7 Prague 14300 Czech Republic LULI Ecole Polytech CNRS CEA UPMC F-91128 Palaiseau France Aperture Opt Sci Inc 170 Pondview Dr Meriden CT 06450 USA

ISBN: (数字)9781510645912

ISBN: (纸本)9781510645912;9781510645905

High intensity lasers in the 10-PW range require large optics (up to 600 mm diameter) with very high surface quality. In our case we have been facing troubles coming from very small wavefront defects at high spatial frequencies;defects that were not visible when checking with a Fizeau-type interferometer that was providing a PSD record. These very small defects were creating high-contrast Talbot fringes when propagating our laser beam. We decided to check carefully how the focal spot of our laser beam was affected and this was the reason why we decided to build collimators. Our collimator is a classical Newton-type telescope that can be used either off-axis or on- axis with a low central occultation (< 12%). The beam comes from a collimated laser source that is focused through a 30-mu m pinhole by a microscope objective (x 20) in order to obtain a "clean" spatial distribution. In the collimated part, optical densities calibrated at the operating wavelength(s) are inserted in order to control the intensity in the focal spot. An operating range of 10 orders of magnitude is obtained with a source emitting 5 mW. The measurement is made in the focal plane of the component to be tested with a CCD camera. In cooperation with Aperture optical Sciences Inc., the collimator was tested with known components and results compared with other available systems. Finally, we are able to identify and to measure periodic defects as low as lambda/2500 and to connect them with their PSD value.

关键词： Focal spot Power Spectral Density

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design strategies of an unobscured three mirror telescope with freeform surfaces for infrared nanosatellite imagery

Design strategies of an unobscured three mirror telescope wi...

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2020 International conference on Space optics, ICSO 2020

作者： Duveau, Louis Lépine, Thierry Hugot, Emmanuel Briottet, Xavier Druart, Guillaume ONERA - Office National d’etudes et de recherches aérospatiales 8 Chemin de la Hunière BP80100 PALAISEAU CEDEX91123 France Univ Lyon Laboratory Hubert Curien CNRS UMR 5516 18 Rue du Professeur Benoît Lauras Saint-Etienne42000 France Aix-Marseille Univ. CNRS CNES LAM 38 rue Fredéric Joliot-Curie Marseille cedex 1313388 France

The new degrees of freedom offered by the new family of freeform surfaces helps compensating for off axis aberrations in optical designs. We define a freeform surface as a non-rotationally symmetric surface which cannot be described as an off-axis part of a conicoid. The use of freeform surfaces allows an increase in performance such as on the field of view, the F-number and compactness of unobscured all reflective telescopes. Reflective designs have the advantage of being light, achromatic, and potentially low-cost due to cheaper materials involved. It could result in industrial production of compact panchromatic systems for various applications ranging from automotive sensors to imaging nanosatellites. In this paper we address the challenges posed by the use of these surfaces in optical design optimization, specifically the minimization of the surface counting, in order to simplify the manufacturing, assembly and integration phases. We focus on three mirror designs and work on the compactness with various flavors in the 3D space. We will discuss our results on a fast, unobscured, non reimaging and well corrected three mirror anastigmat (TMA) design for a nanosatellite thermal imaging payload using uncooled bolometers. Optimization method of a TMA under volume and straylight constraints is described. A tolerance analysis is performed and minimal alignment is required even for large tolerances. © 2021 ESA and CNES

关键词： optical design

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