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检索条件"任意字段=Conference on Current Developments in Optical Design and Engineering V"

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Optomechanical design of the incubator Wide Field of view Imaging Spectrometer

Optomechanical design of the incubator Wide Field of View Im...

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conference on current developments in Lens design and optical Systems engineering

作者： Haring, RE vanstone, G Nguyen, F Rodil, C Orbital Sci Corp Pomona CA 91767 USA

ISBN: (纸本)0819437387

The optomechanical design of the Wide Field of view Imaging Spectrometer (WFIS) is presented. Developed under NASA's Instrument Incubator Program, the Incubator WFIS is a hyperspectral-imaging spectrometer covering a 120 degrees x .015 degrees field of view over a 360 nm to 1000 nm spectral range. The Incubator's mission is to demonstrate, via night aboard NASA's DC-8 Research Aircraft, new technology for earth science. The Incubator WFIS is designed specifically for observing the earth and earth's atmosphere for chemistry and aerosol studies. The optomechanical design couples an off-axis F/3 Schwarzschild telescope to a three element Offner Spectrometer using two unique anamorphic/aspheric field elements. The complete sensor, including a CCD detector and electronics, occupies a volume of approximately cubic shape measuring 25 cm on an edge. An off-axis optical system such as the incubator WFIS requires a multidisciplinary design approach. This paper emphasizes the importance that systems approach plays in optomechanical design. This is typified by the trades performed to establish the optimum design alternative for the optical metering structure to achieve the 0.010 nm wavelength stability (with a 0.005 nn goal) needed for the science mission.

关键词： hyperspectral imaging remote sensing

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design of an interferometric system for piston measurements in segmented primary mirrors

Design of an interferometric system for piston measurements ...

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conference on current developments in Lens design and optical Systems engineering

作者： Arasa, J Laguarta, F Pizarro, C Tomàs, N Pintó, A UPC Ctr Dev Sensors Instrumentat & Syst CD6 E-08222 Terrassa Spain

ISBN: (纸本)0819437387

Recently, telescopes with segmented primary mirrors are becoming increasingly popular due to their ability of achieving large apertures without the inconveniences caused by the fabrication and handling of monolithic surfaces with 8m (or over) in diameter. The difference in position of each pair of adjacent segments along the local normal of their interface (called piston hereafter), however, needs to be precisely measured in order to provide a diffraction-limited image. If a system yielding the nanometric accuracy required in piston measurements worked in daylight hours, the resultant saving in observation time would be an important advance on a majority of the state-of-the-art piston measurement systems. An interferometric piston measurement instrument accomplishing such objectives has been designed starting from the usual Michelson configuration at the CD6 (Terrassa, Spain), and its final test has been carried out in the test workbench of the Institute de Astrofisica de Canarias (IAC, Canary Islands, Spain). Its optical layout relies on projecting the reference arm of the interferometer onto one of the segments of the pair considered, along the direction of the local normal to the surface while the measurement arm is projected onto the interface which divides the pair of segments considered. The field of view and its illumination are calculated to be equivalent in both segments. The lateral shift of the fringes in both interferograms determines the piston error present. A combination of monochromatic and white light is used, in order to remove the lambda /2 phase ambiguities present in piston measurements without losing the required resolution in the measurement. In this paper, the optical design of this interferometric piston measurement instrument will be presented. The particular configuration used in the interferometer, the implementation of an imaging system allowing to see both the interface of the segments and the interference fringes, the effect of the ext

关键词： optical design white light interferometer segmented primary mirrors telescopes

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Optimum design of a lightweight mirror using aluminum foam or honeycomb sandwich construction - A case study for the GLAS telescope

Optimum design of a lightweight mirror using aluminum foam o...

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conference on current developments in Lens design and optical Systems engineering

作者： Conkey, SB Lee, C Chaykovsky, S Content, D Morell, A Budinoff, J Swales Aerosp Inc Beltsville MD 20705 USA

ISBN: (纸本)0819437387

A simple closed form solution was derived for the optimum weight design of a cylindrical sandwich mirror for a given self-weight deflection and mirror radius. This optimum solution is based on the generalized deflection equation for an axisymmetrically supported thick circular plate. This two parameter equation of deflection captures the deflection of the plate caused by bending and transverse shear. The solution yields the optimum facesheet thickness, core thickness, and core density. The derived optimum solution was used in a case study for the GLAS (Geoscience Laser Altimeter System) primary mirror. This Beryllium mirror is manufactured with an open back isogrid pattern. The objective of this study is to determine a lightweight mirror design using Aluminum sandwich construction that can meet the performances of the current mirror and reduce fabrication costs. With the optimum solution several first order approximations using Aluminum honeycomb or foam core were determined. The performance, 1 g deflection, and wave front error of these designs was determined from Finite Element Analysis. The results conclude that sandwich construction outperforms the isogrid design by significant margins on both weight and distortion if the same material is used. Because of its superior specific stiffness the Beryllium isogrid design still marginally outperforms the optimum Aluminum sandwich design. However, the Aluminum sandwich design should provide significant advantages on cost and ease of fabrication over Beryllium isogrid designs.

关键词： aluminum foam lightweight sandwich panel mirror optimization

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design of high numerical aperture Fourier objectives for holographic memory card writing/reading equipment

Design of high numerical aperture Fourier objectives for hol...

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conference on current developments in Lens design and optical Systems engineering

作者： Erdei, G Fodor, J Kalló, P Szarvas, G Ujhelyi, F Optilink Hungary Ltd H-1031 Budapest Hungary

ISBN: (纸本)0819437387

A pair of special Fourier transforming objectives intended for use in a Holographic Memory Card (HMC) writing/reading equipment have been designed and fabricated. At writing in, the objectives Fourier transform a binary pattern, representing the data displayed by an SLM, into the storage medium of the HMC, where the Fourier transform is recorded as a polarisation hologram. At reading out, the objectives inverse Fourier transform the reconstructed hologram onto the surface of a CCD array. The Fourier space NA of the objectives is high enough to achieve a theoretical data density of 1 bit/mum(2) For comparison reasons we designed two optically identical objectives of basically different structures: one is an aspheric glass doublet, the other is an all-spherical five-element system (arranged in two lens groups). Computer analysis of the objectives shows that both systems are diffraction limited in object and Fourier space and have a distortion of less than 1%. In this paper we overview the theory of Fourier objectives, present our design method, describe the optical behaviour of the designed systems, show our test results performed on the fabricated aspheric objective and present our experiences at manufacturing aspheric glass lens prototypes.

关键词： optical design geometrical optics Fourier objective spherical system aspheric glass lens

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Baffling system for the Wide Angle Camera (WAC) of ROSETTA mission

Baffling system for the Wide Angle Camera (WAC) of ROSETTA m...

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conference on current developments in Lens design and optical Systems engineering

作者： Brunello, P Peron, F Barbieri, C Fornasier, S IUAV Univ Dept Bldg Construct Venice Italy

ISBN: (纸本)0819437387

After the experience of GIOTTO fly-by to comet Halley in 1986, the European Space Agency planned to improve the scientific knowledge of these astronomical objects by means of an even more ambitious rendezvous mission with another comet (P/Wirtanen). This mission, named ROSETTA, will go on from 2003 to 2013, ending after the comet perihelion phase and including also the ny-by with two asteroids of the main belt (140 Siwa and 4979 Otawara). Scientific priority of the mission is the in situ investigation of the cometary nucleus, with the aim of better understanding the formation and the composition of planetesimals and their evolution over the last 4.5 billions of years. In this context, the Authors were involved in the design of the baffling for the Wide Angle Camera (WAC) of the imaging system (OSIRIS) carried on board of the spacecraft. Scientific requirements for the WAC are: a large field of view (FOv) of 12 degrees x 12 degrees with a resolution of 100 mu rad per pixel, Uv response, and a contrast ratio of 10(-4) in order to detect gaseous and dusty features close to the nucleus of the comet. To achieve these performances, a fairly novel class of optical solutions employing off-axis sections of concentric mirrors was explored. Regarding baffling, the peculiar demand was the rejection of stray-light generated by the optics for sources within the FOv, since the optical entrance aperture is located at the level of the secondary mirror (instead of the primary as usual). This paper describes the baffle design and analyzes its performances, calculated by numerical simulation with ray tracing methods, at different angles of incidence of the Light, for sources both outside and inside the field of view.

关键词： baffling system optical design stray-light analysis

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Reflectivities of light-absorptive coatings within visible wavelengths range

Reflectivities of light-absorptive coatings within visible w...

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conference on current developments in Lens design and optical Systems engineering

作者： Moldosanov, KA Henneck, R Skrynnikov, AM Kashirin, vA Makarov, vP Kobtsov, GA Samsonov, MA Kim, LS Special Design Off OKB Aalam Bishkek 720021 Kyrgyzstan

ISBN: (纸本)0819437387

This paper concerns the light-absorptive coatings intended for reduction of stray sunlight in the satellite-borne optical instrumentation and particle-analyzing apparatus operating in open space under intensive solar illumination. Though the inner surfaces are the passive elements in optical instruments, nontheless the condition and reflectivity of their surfaces can have noticeable effect on the signal-to-noise ratio of their detectors. In order to reduce an influence of the stray light on sensitivity of devices, the reflectivities of inner surfaces are strived to keep minimum in those wavelengths ranges, where the detectors spectral responses are high. We measured reflectivities of several types of traditional Tight-absorptive coatings and also tested our own approach to development of low reflectivity materials. The reflectivities were measured in visible and near-infrared wavelengths ranges (400 to 927 nm), as well as at the hydrogen Lyman-alpha line (121.6 mn), the most intensive line of the solar Uv radiation. Also, the values of the solar absorptance alpha (s) and the emissivity epsilon were measured. They made it possible to classify the investigated coatings with their respects to a possible use in converters of solar radiation into the heat. Conclusions are given on application of diverse coatings depending on the instrument's detector type, operational wavelengths range, and operating conditions.

关键词： stray light sunlight light-absorptive coating low reflectivity material optical instrumentation

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Projection lenses for high resolution ablation with excimer lasers:: high performance, wide field and high Uv laser power

Projection lenses for high resolution ablation with excimer ...

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conference on current developments in Lens design and optical Systems engineering

作者： Schlichting, J Winkler, K Körner, L Schletterer, T Burghardt, B Kahlert, HJ JENOPT Laser Opt Syst GMBH Jena Germany

ISBN: (纸本)0819437387

The productive and accurate ablation of microstructures demands the precise imaging of st mask pattern onto the substrate under work. The job can be done with high performance wide field lenses as a key component of ablation equipment. The image field has dimensions of 20 to 30 mm. Typical dimensions and accuracy of the microstructures are in the order of some microns. On the other hand, the working depth of focus (DOF) has to be in the order of some 10 microns to be successful on drilling through 20 to 50 mum substrates. All these features have to be reached under the conditions of high power laser Uv light Some design principles for such systems are applied, such as optimum number of elements, minimum tolerance sensitivity, material restrictions for the lens elements as well as mechanical parts (mounting), restrictions of possible power densities on lens surfaces (including ghosts), matched quality for the manufactured system. The special applications require appropriate performance criteria for theoretical calculation and measurements, which allow to conclude the performance of the application. The base is wave front calculation and measurement (using Shack-Hartmann sensor) in Uv. Derived criteria are calculated and compared with application results.

关键词： laser ablation excimer laser imaging high performance optics systems design

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Aerial vehicles and mars robotic outposts

Aerial vehicles and mars robotic outposts

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Space 2000 conference and Exposition

作者： Rand, James L. Kerzhanovich, viktor v. Winzen Engineering San Antonio TX United States NASA Jet Propulsion Laboratory Pasadena CA United States

The development of aerial vehicles intended to operate in the Mars environment has been of interest to various science groups around the world for over thirty years. Conceptual designs have been suggested which utilize powered aircraft, aerostats, solar powered balloons and a variety of other devices intended to carry remote sensing instruments. Recent proposals to NASA have suggested the inflation of balloons during reentry to provide a long duration free floating platform for high resolution imaging. This type of mission has been made especially challenging by the severe weight limitations placed on a buoyant vehicle in a rarefied atmosphere. The presence of a permanent, continuous, outpost, which is either manned or robotic, will greatly simplify the inflation and launch of any aerial vehicle. The purpose of this paper is to report on recent developments in both materials and design which will permit the reliable use of long duration balloons on Mars. It will be shown that the use of oriented thin films will permit the reliability of superpressure balloons to be increased by at least a factor of five over current designs using balanced material properties. © 2000 by Winzen engineering, Inc.

关键词： Solar energy

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Trawl-safe profiler development at SACLANT centre for shallow water environmental assessment and real time modeling

Trawl-safe profiler development at SACLANT centre for shallo...

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MTS/IEEE Oceans conference and Exhibition on Where Marine Science and Technology Meet

作者： Tyce, R de Strobel, F Grandi, v Gualdesi, L SACLANT Undersea Res Ctr I-19138 San Bartolomeo SP Italy

ISBN: (纸本)0780365518;0780365526

A Shallow-water Environmental Profiler in Trawl-safe, Real-time configuration (SEPTR) has been developed by SACLANT Undersea Research Centre in support of oceanographic modeling and rapid environment assessment programs. It is being deployed operationally for the first time during September 2000 as part of real-time multi-scale oceanographic modeling experiments in the Ligurian Sea. The SEPTR system combines the best capabilities of the Barny Sentinel ADCP bottom platform and the SWEEP water column profiler developments at SACLANT Centre. It is intended for 3-6 month deployments in areas where water column instruments are at risk from fishing trawlers, but with real-time data return and control via two-way cellular or satellite communication. SEPTR includes a micro-controller based bottom platform which houses an Acoustic Doppler current Profiler (ADCP), wave/tide gage, ambient noise sensor array, and water column profiler buoy system. The profiler buoy system has an independent micro-controller with its own sensor suite. Communications and battery recharge from the bottom platform are supplied through the 2 mm diameter cable. The profiler requests winch operations from the bottom electronics for autonomous vertical profiling of CTD and optical properties of the water column in depths down to 100m. Cable and profiler drag permit profiling with currents up to 2 knots at 50m depth and 1 knot at 100m depth. The profiler buoy includes DGPS navigation capability along with two-way communication capability while on the surface. It also includes acceleration and magnetic field sensors capable of surface wave buoy measurements. The bottom platform includes an extended duration battery package in the recoverable barnacle-shaped housing. Recovery of the entire system is accomplished through either radio or acoustic communication with the profiler in order to release a messenger buoy. If the platform becomes inverted due to trawling, the system without ballast can still be rec

关键词： Ocean engineering

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Microwave properties of InGaAlAs resonant-tunneling optical modulators

Microwave properties of InGaAlAs resonant-tunneling optical ...

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International conference on Microwaves, Radar and Wireless Communications

作者： v.E. Lyubchenko N.v. Alkeev C.N. Ironside J.M.L. Figueiredo C.R. Stanley Institute of Radioengineering & Electronics Russian Academy of Science Moscow Russia Department of Electronics and Electrical Engineering University of Glasgow Glasgow UK

ISBN: (纸本)8390666235

Impedance of resonant-tunneling heterostructure diodes (RTD) based on InGaAlAs and designed for modulation of optical radiation was experimentally studied in the frequency range of 45 MHz-18 GHz. The dependence of the equivalent circuit parameters versus bias voltage was analyzed and the current harmonic spectrum at varistor frequency multiplication was calculated. The effect of frequency multiplication was experimentally demonstrated at low frequencies.

关键词： Resonant tunneling devices optical modulation Frequency conversion Impedance Diodes optical design Equivalent circuits voltage Harmonic analysis varistors

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