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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering 1991"

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New designs of corrected Dall-Kirkham-type telescopes

New designs of corrected Dall-Kirkham-type telescopes

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current developments in Lens design and optical engineering VI

作者： Beach, David Rakich, Andrew KiwiStar Optics Industrial Research Limited POB 2225 Auckland New Zealand Applied Physics Ltd. 50 Birchs Rd Prebbleton Christchurch 8153 New Zealand EOS Space Systems Pty Ltd 111 Canberra Ave Griffith 2603 Australia

Improvement in the fabrication of large solid-state focal plane array photonic sensors has emphasized the need for telescopes with flat and wide angular fields of high resolution and with large spectral passbands. To increase the angular field of Cassegrain-like telescopes, various designs of correctors have been incorporated in the optical train. This paper compares specific designs based on the Dall-Kirkham format of prolate ellipsoid primary and spherical secondary mirrors, in which excellent correction is achieved over a significant field angle. The attraction of the Dall-Kirkham format is the relative ease of fabrication to a very high accuracy by simple null tests of the concave prolate-ellipsoid primary by specific separation of light source and knife-edge, and of the convex secondary by interference-matching with a previously null-tested concave spherical master. Null tests of the more common Ritchie-Chrétien design require the additional fabrication of two "Hindle spheres" or other auxiliary optics such as holograms for testing of the hyperboloidal primary and for the hyperboloidal secondary. If the Dall-Kirkham format is modified to include variants in which the "Cassegrain" image is imperfect or even afocal, it is possible to design simple corrector relays with exceptional final imaging characteristics. Examples are presented that provide distortionless, diffraction-limited, flat-field imaging over usefully wide fields and large passbands at speeds of f/5 - f/4, and having an unusually compact layout.

关键词： optical telescopes

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Off-axis scatter measurement of the Mars Reconnaissance Orbiter (MRO) optical Navigation Camera (ONC)

Off-axis scatter measurement of the Mars Reconnaissance Orbi...

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current developments in Lens design and optical engineering VI

作者： Stauder, John L. Lowman, Andrew E. Thiessen, Dave Day, Darryl Miles, D.O. Space Dynamics Laboratory Utah State University Logan UT 84321 Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109

The optical Navigation Camera (ONC) is part of NASA's Mars Reconnaissance Orbiter (MRO) scheduled for an August 2005 launch. The design is a 500 mm focal length, F/8.3 Ritchey-Chrétien with a refractive field corrector. Prior to flight, the off-axis performance of the ONC was measured at visible wavelengths in the off-axis scatter facility at the Space Dynamics Laboratory (SDL). This unique facility is designed to minimize scatter from the test setup to prevent data corruption. Testing was conducted in a clean room environment, and the results indicate that no detectable contamination of the optics occurred during testing. Measurements were taken in two time frames to correct an unanticipated stray light path, which occurred just outside of the sensor's field-of-view. The source of the offending path was identified as scatter from the edges of the field corrector lenses. Specifically, scatter from the interface between the flat ground glass and polished surfaces resulted in significant "humps" in the off-axis response centered at ± 1.5°. Retesting showed the removal of the humps, and an overall satisfactory performance of the ONC. The troubleshooting, correction, and lessons learned regarding the above stray light path was reported on in an earlier paper. This paper discusses the measurement process, results, and a comparison to a software prediction and other planetary sensors. The measurement validated the final stray light design and complemented the software analysis.

关键词： Light scattering

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Advances in Lenticular lens arrays for visual display

Advances in Lenticular lens arrays for visual display

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current developments in Lens design and optical engineering VI

作者： Johnson, R. Barry Jacobsen, Gary A. SPIE CyberAir Development Corporation 3077-K Leeman Ferry Rd Huntsville AL 35801 United States LentiClear Lenticular Lens Inc. 105 East Irving Park Rd Itasca IL 60143 United States

Lenticular lens arrays are widely used in the printed display industry and in specialized applications of electronic displays. In general, lenticular arrays can create from interlaced printed images such visual effects as 3-D, animation, flips, morph, zoom, or various combinations. The use of these typically cylindrical lens arrays for this purpose began in the late 1920's. The lenses comprise a front surface having a spherical cross-section and a flat rear surface upon where the material to be displayed is proximately located. The principal limitation to the resultant image quality for current technology lenticular lenses is spherical aberration. This limitation causes the lenticular lens arrays to be generally thick (0.5 mm) and not easily wrapped around such items as cans or bottles. The objectives of this research effort were to develop a realistic analytical model, to significantly improve the image quality, to develop the tooling necessary to fabricate lenticular lens array extrusion cylinders, and to develop enhanced fabrication technology for the extrusion cylinder. It was determined that the most viable cross-sectional shape for the lenticular lenses is elliptical. This shape dramatically improves the image quality. The relationship between the lens radius, conic constant, material refractive index, and thickness will be discussed. A significant challenge was to fabricate a diamond-cutting tool having the proper elliptical shape. Both true elliptical and pseudo-elliptical diamond tools were designed and fabricated. The plastic sheets extruded can be quite thin (<0.25 mm) and, consequently, can be wrapped around cans and the like. Fabrication of the lenticular engraved extrusion cylinder required remarkable development considering the large physical size and weight of the cylinder, and the tight mechanical tolerances associated with the lenticular lens molds cut into the cylinder's surface. The development of the cutting tool and the lenticular engraved extr

关键词： optical instrument lenses

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design and testing of a one-meter membrane mirror with active boundary control

Design and testing of a one-meter membrane mirror with activ...

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UV/optical/IR Space Telescopes: Innovative Technologies and Concepts II

作者： Moore, James D. Patrick, Brian G. Chodimella, Surya Marker, Dan DeBlonk, Brett SRS Technologies Huntsville AL 35806 United States Air Force Research Lab. Kirtland AFB NM 87117

The use of thin-film membranes is of considerable interest for lightweight mirror applications. The low areal density makes them ideal for large aperture imaging applications. One type of setup looked into in the past has been the lenticular design, which consists of a clear canopy attached to a reflective film that uses positive pressure to set the curvature of the mirror. One drawback to this concept has been the fact that too much error was introduced during the pass through the canopy due to material inhomogeneities and poor optical properties. This is no longer an issue thanks to developments over the past several years in the field of optical-quality polymer development. Thin-films (< 24 microns) can now be routinely made with surface roughness, thickness variation, and very good transmission properties well within specification for many visible and IR applications. The next step in this developmental process has been maintaining a prescribed figure in the mirror. This paper summarizes the current efforts in fabricating and testing a 1-meter class lenticular membrane mirror system utilizing active boundary control and stress-coating applications to form a usable aperture for visible imaging applications.

关键词： Mirrors

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Microstructured fibres for sensing applications

Microstructured fibres for sensing applications

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Photonic Crystals and Photonic Crystal Fibers for Sensing Applications

作者： Petrovich, M.N. Van Brakef, A. Poletti, F. Mukasa, K. Austin, E. Finazzi, V. Petropoulos, P. O'Driscoll, E. Watson, M. DelMonte, T. Monro, T.M. Dakin, J.P. Richardson, D.J. University of Southampton Southampton United Kingdom School of Chemistry and Physics University of Adelaide Adelaide SA Australia Furukawa Electric Co. Ltd. Fitel-Photonics Laboratory Ichihara Chiba Japan BAE SYSTEMS Advanced Technology Centre Sowerby Building Bristol United Kingdom

Microstructured fibres (MOFs) are among the most innovative developments in optical fibre technology in recent years. These fibres contain arrays of tiny air holes that run along their length and define the waveguiding properties. optical confinement and guidance in MOFs can be obtained either through modified total internal reflection, or photonic bandgap effects;correspondingly, they are classified into index-guiding Holey Fibres (HFs) and Photonic Bandgap Fibres (PBGFs). MOFs offer great flexibility in terms of fibre design and, by virtue of the large refractive index contrast between glass/air and the possibility to make wavelength-scale features, offer a range of unique properties. In this paper we review the current status of air/silica MOF design and fabrication and discuss the attractions of this technology within the field of sensors, including prospects for further development. We focus on two primary areas, which we believe to be of particular significance. Firstly, we discuss the use of fibres offering large evanescent fields, or, alternatively, guidance in an air core, to provide long interaction lengths for detection of trace chemicals in gas or liquid samples;an improved fibre design is presented and prospects for practical implementation in sensor systems are also analysed. Secondly, we discuss the application of photonic bandgap fibre technology for obtaining fibres operating beyond silica's transparency window, and in particular in the 3μ,m wavelength region, j.

关键词： optical fibers

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FPGA developments for the SPARTA project

FPGA developments for the SPARTA project

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Astronomical Adaptive Optics Systems and Applications II

作者： Goodsell, S.J. Fedrigo, E. Dipper, N.A. Donaldson, R. Geng, D. Myers, R.M. Saunter, C.D. Soenke, C. Centre for Advanced Instrumentation Department of Physics Durham University South Road Durham DH1 3LE United Kingdom European Southern Observatory Karl-Schwarzschild-Str. 2 D-85748 Garching bei München Germany

The European Southern Observatory (ESO) and Durham University's Centre for Advanced Instrumentation (CfAI) are currently designing a standard next generation Adaptive Optics (AO) Real-Time Control System. This platform, labelled SPARTA 'Standard Platform for Adaptive optics Real-Time Applications' will initially control the AO systems for ESO's 2nd generation VLT instruments, and will scale to implement the initial AO systems for ESO's future 100m telescope OWL. Durham's main task is to develop the Wavefront Sensor (WFS) front end and Statistical Machinery for the SPARTA platform using Field Programmable Gate Arrays (FPGA). SPARTA takes advantage of a FPGA device to alleviate the highly parallel computationally intensive tasks from the system processors, increasing the obtainable control loop frequency and reducing the computational latency in the control system. The WFS pixel stream enters a PMC hosted FPGA card contained within the SPARTA platform via optical fibres carrying the VITA 17.18/10 standard 2.5Gbps-1 serial Front Panel Data Port (sFPDP) protocol. Each FPGA board can receive a maximum of l0Gbs -1 of data via on-board optical transceivers. The FPGA device reduces WFS frames to gradient vectors before passing the data to the system processors. The FPGA allows the processors to deal with other tasks such as wavefront reconstruction, telemetry and real-time data recording, allowing for more complex adaptive control algorithms to be executed. This paper overviews the SPARTA requirements and current platform architecture, Durham's Wavefront Processor FPGA design and it concludes with a future plan of work.

关键词： Adaptive optics

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Visible-NIR imaging optics for a Fourier transform spectrometer

Visible-NIR imaging optics for a Fourier transform spectrome...

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Conference on current developments in Lens design and optical engineering V

作者： Thibault, S Reecht, M Lavigne, JF Desnoyers, N INO Opt Design & Optomech Grp St Foy PQ Canada

ISBN: (纸本)0819454613

We present details of optical design, opto-mechanical design and testing of a visible-NIR imaging optical system for a Fourier transform spectrometer dedicated to astronomical application at the Mont Megantic Observatory (Observatoire du Mont Megantic, OMM, located south Quebec city, Canada). design considerations as well as testing and experimental results are presented.

关键词： astronomical instrumentation optical design opto-mechanical design imaging Fourier transform spectrometer

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Proceedings of SPIE: current developments in Lens design and optical engineering IV

Proceedings of SPIE: Current Developments in Lens Design and...

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current developments in Lens design and optical engineering IV

The proceedings contains 15 papers from the Proceedings of SPIE: current developments in Lens design and optical engineering IV. Topics discussed include: Zernike polynomials and aberration balancing;optical design for imaging spectroscopy;integral optical system design of injection molded optics;structured design method for automotive lamp reflectors;optical systems for free-space laser communications;and current status and future direction of sensors in Earth observing satellites.

关键词： optical systems

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Small catadioptric microscope optics

Small catadioptric microscope optics

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Conference on current developments in Lens design and optical engineering V

作者： Shafer, DR Chuang, YH Armstrong, JJ David Shafer Opt Design Fairfield CT 06430 USA

ISBN: (纸本)0819454613

New catadioptric objectives have been developed with large bandwidths in the DUV, high numerical apertures (NAs), and small size. This can be achieved using a single glass material. designs are specifically optimized for loose alignment tolerances and ease of manufacturability. Applications include broad band DUV imaging and high resolution immersion imaging for industrial microscopy and life sciences.

关键词： catadioptric DUV broadband microscope objective

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Development of fast camera objective for spectrograph of Mont Megantique telescope

Development of fast camera objective for spectrograph of Mon...

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Conference on current developments in Lens design and optical engineering V

作者： Thibault, S Wang, M Bernier, S INO Opt Design Grp St Foy G1P 4S4 PQ Canada

ISBN: (纸本)0819454613

A fast (F/1.55) and wide-angle refractive camera objective has been developed to work with a large-size CCD on the focal plane of the spectrograph of Mont Megantique telescope for large spectral coverage from UV to VIS and up to NIR. The novel camera objective has been designed and optimized with three different glass combinations in order to have higher throughputs for large spectral coverage, especially in UV region. The tolerance analysis of the camera objective is given in the paper. The final opto-mechanical design of the objective is discussed with the consideration of the manufacturing tolerance in the optical and mechanical parts, as given in this paper. The used components have been minimized to reduce the light inherent lost. The optical testing results displayed the good optical performance of the camera with the required resolution for the whole FOV, as predicted by the optical simulation and computation. The broadband AR coating, enhanced on UV region, have been used on each surface of the lenses in the optical system.

关键词： optical engineering fast spectrograph camera opto-mechanical design astronomical instrumentation

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