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optical design of SHASM: Segmented hexagon array solar mirror

Optical design of SHASM: Segmented hexagon array solar mirro...

引用

conference on current developments in Lens design and optical Systems engineering

作者： Huegele, VB NASA George C Marshall Space Flight Ctr SOMTC Huntsville AL 35812 USA

ISBN: (纸本)0819437387

A segmented array of mirrors was designed for a solar concentrator test stand at MSFC for firing solar thermal propulsion engines. the 144 mirrors each have a spherical surface to approximate a parabolic concentrator when combined into the entire 17-foot diameter array. the mirror segments are aluminum hexagons that had the surface diamond turned and quartz coated. the array focuses sunlight reflected from a heliostat to a 4 inch diameter spot containing 8 kilowatts of power at the 15 foot focal point. the derivation of the surface figure for the respective mirror elements is shown. the alignment process of the array is discussed and test results of the system's performance are given.

关键词： segmented mirror array spherical approximation solar thermal propulsion solar power

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optical design of a near-infrared birefringent filter system and measurement on birefringence index of calcite

Optical design of a near-infrared birefringent filter system...

引用

conference on current developments in Lens design and optical Systems engineering

作者： Wang, JS Wang, HM Spirock, TJ Lee, CY Ravindra, NM Ma, J Goode, PR Denker, C New Jersey Inst Technol Dept Appl Phys Newark NJ 07102 USA

ISBN: (纸本)0819437387

In this paper, we present an optical design of a near-infrared (at FeI 15648.5 Angstrom) birefringent filter system which is used to obtain the chromatic images of the sun and measure the solar magnetic field at the Big Bear Solar Observatory (BBSO). this system consists of a prefilter, a liquid crystal analyzer, a wavelength-tunable birefringent filter and a Fabry-Perot Etalon. this system is expected to achieve a clean narrow pass band (1/8 Angstrom). It can also be tuned across the spectral line to obtain line profiles of two-dimensional fields of view. During the design of the tunable near-IR birefringent filter and the test of its components, we found the value of birefringence index mu (n(e) - n(o)) of calcite at spectral range near 15648.5 Angstrom is very different from the value in literature(1). Because the birefringence index is important for the design of birefringent optical components, the birefringence index of calcite and its thermal coefficient are measured. Some test results of the four pairs of calcite prate used in the birefringent filter are presented.

关键词： near-infrared birefringent filter calcite birefringence index Zeeman effect

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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...

引用

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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Compact finger imager

Compact finger imager

引用

8th conference on current developments in optical design and optical engineering

作者： Clark, PP Goodman, DS Plummer, WT Polaroid Corp Dept Opt Engn Cambridge MA 02139 USA

ISBN: (纸本)0819432652

We present the design of a compact, low-cost finger imager, to be used for enrolling and recognizing individuals based upon their finger ridge patterns. the optical system employs viewing beyond the critical angle and darkfield illumination for maximum image contrast. the optical system is afocal and telecentric, achieving corrected distortion with oblique viewing.

关键词： optical system design biometrics fingerprint plastic aspheric lenses

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Novel design concepts for UV laser beam shaping

Novel design concepts for UV laser beam shaping

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8th conference on current developments in optical design and optical engineering

作者： Bernges, J Unnebrink, L Henning, T Kreutz, EW Poprawe, R Rhein Westfal TH Aachen Lehrstuhl Lasertech D-52074 Aachen Germany

ISBN: (纸本)0819432652

Recent developments in the field of high transmitting beam shaping optics for material processing are presented. Central parts of these optics are non-rotationally symmetric optical elements (NOEs). Advanced design principles for NOEs are presented. An optical setup containing a NOE and a system for the adaptation of the spatial coherence properties of excimer lasers to the processing requirements are presented together with beam diagnosis and material processing results. In comparison to results obtained earlier a largely increased beam shaping performance is demonstrated.

关键词： excimer laser non-rotationally symmetric optical elements beam shaping transversal degree of coherence optical systems

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optical design of the Next Generation Sky Survey (NGSS) Telescope

Optical design of the Next Generation Sky Survey (NGSS) Tele...

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8th conference on current developments in optical design and optical engineering

作者： Chrisp, MP Ball Aerosp & Technol Corp Boulder CO 80301 USA

ISBN: (纸本)0819432652

the Next Generation Sky Survey (NGSS) Telescope is a spaceborne cryogenic optical telescope with four channels covering the wavelength range 3.5 to 23 microns. the 0.5 m aperture telescope is based on a modified three mirror afocal design, with a scan mirror at the exit pupil compensating for the spacecraft motion. After the scan mirror, the light is spectrally split and focussed by three refractive camera systems onto four detector arrays. the nominal optical design exceeds the requirement of diffraction limited performance at 8 microns wavelength over the 1 degree by 0.5 degree field of regard.

关键词： optical design telescope infrared mirrors space cryogenic

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Aberrations of perturbed and unobscured optical systems

Aberrations of perturbed and unobscured optical systems

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8th conference on current developments in optical design and optical engineering

作者： Agurok, I Phys Opt Corp Torrance CA 90505 USA

ISBN: (纸本)0819432652

the double expansion of the wavefront deformation in Zernike polynomials over the pupil and the field-of-view coordinates is a powerful tool for lens design, testing, and alignment. It provides a compact description of the wavefront deformation of perturbed and unobscued optical systems over the field-of-view. the integral of the mean-square wavefront deformation over the field-of-view is simply the sum of the products of the norms of the polynomials and the squared global coefficients. Eight or ten global coefficients can provide a comprehensive centered system description. Only fourteen main additional global coefficients is sufficient for the description of perturbed and unobscured optical systems.

关键词： double expansion of wavefront deformation perturbed and unobscured systems

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optical tiling for wide field-of-view head-mounted displays

Optical tiling for wide field-of-view head-mounted displays

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8th conference on current developments in optical design and optical engineering

作者： Hoppe, MJ Melzer, JE Kaiser Electroopt Inc Display Syst Engn Dept Carlsbad CA USA

ISBN: (纸本)0819432652

the design of a wide field-of-view head-mounted display (HMD) is very challenging. Unfortunately, traditional design methods produce low-resolution imagery that is unacceptable for some tasks. One method of addressing this challenge is to optically tile several smaller field-of-view displays to form a single, wide field-of-view, high-resolution image. this paper will address design issues specific to optically tiled systems including optical performance, seam placement and binocular rivalry.

关键词： optical tiling head-mounted display HMD wide field-of-view VIM (R) optical collimator

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Rotating prisms scanning system to equip a NFOV camera lens

Rotating prisms scanning system to equip a NFOV camera lens

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8th conference on current developments in optical design and optical engineering

作者： Curatu, E Chevrette, P StGermain, D Natl Opt Inst St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

this paper presents the results given by the nominal design and tolerance analysis of a narrow-field-of-view camera lens equipped with a rotating prism scanning system. the first aspects taken into consideration have been the compensation of the chromatic aberration, distortion reduction, and the correlation between depth-of-field and lens resolution. then, a rigorous approach to determine the relationship between the field-of-regard direction and the prism orientations is discussed. Finally, the tolerance analysis results give the predictable pointing direction precision as function of the system tolerances.

关键词： rotating prisms Risley prisms scanning system

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