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

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Increasing the phased field of view of large distributed aperture telescope arrays

Increasing the phased field of view of large distributed ape...

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conference on current developments in lens design and optical engineering II

作者： Sigler, RD Palmer, AL Lockheed Martin Space and Strategic Missiles (United States)

ISBN: (纸本)0819441554

There are some unique optical design considerations in the design of a distributed aperture telescope array consisting of a number of individual afocal collector telescopes and a single combining telescope. As might be expected, diffraction limited imagery over the field of view requires the correction of spherical aberration, coma, astigmatism and field curvature. However, there is an additional requirement on the design of the collectors. Coherent addition of the light from the collectors requires that the ratio of the sine of the input and output chief ray angles be essentially constant over the field of view. This output angle restriction is equivalent to requiring the collector telescopes to have a specific variation in angular magnification with field. Variation of magnification with field is, by definition, image distortion. With simple two and three mirror afocal collector telescope designs, there are insufficient design degrees of freedom to control distortion in addition to the other aberrations. In this paper, we present a modification to a three-mirror collector design that permits the image distortion to be adjusted in a controlled manner without influencing the other third order, Seidel aberrations. This modification permits a large distributed aperture telescope array to be designed that has both a simple optical form and a much larger phased (i.e. corrected) Field of view. As a design example, we investigate the effect of the distortion correcting element on the size of the achievable field of view for a 45 meter diameter distributed aperture telescope array populated with 8 meter diameter collectors.

关键词： lens design distributed aperture telescope aberration theory distortion

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High speed and high definition technology by multi-beam scanning in laser printing

High speed and high definition technology by multi-beam scan...

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conference on current developments in lens design and optical engineering II

作者： Hayashi, Y Amada, T Ricoh Co Ltd Ricoh Imaging Technol Div Tokyo Japan

ISBN: (纸本)0819441554

Multi-beam scanning is the effective method for high speed and high definition in Laser Printing, and there are three systems for this method as fellows. 1) Laser Diode (LD) Array system 2) System for dividing a single light source 3) System for combining beams of multiple LDs by optical devices Each of these systems has both advantage and disadvantage, and which one to use among these three depends on application requirements. The third system above allows for the use of conventional LDs and therefore it is low cost and offers a large degree of freedom in selecting light sources. We have already developed a Two LD Prism-based Light Source Unit that uses a C, prism to combine the beams emitted by two LDs. This system achieves stable optical characteristics with any conventional scanning optical elements. We have further enhanced this system. We have determined an optimum design that includes scanning lens and have developed the Two LD Beam-crossing Light Source Unit which performs multi-beam scanning using two LDs without a prism. In this paper, we report on recent multi-beam-scanning technologies and introduce our newly developed the Two LD Beam-crossing Light Source Unit.

关键词： Light sources optical scanning systems Mirrors Prisms Monochromatic aberrations Nonimpact printing optical components optical fibers Temperature metrology Semiconductor lasers

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design, tolerancing and alignment of pushbroom imaging spectrometers for high response uniformity

Design, tolerancing and alignment of pushbroom imaging spect...

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conference on current developments in lens design and optical engineering II

作者： Mouroulis, P Shea, JJ Thomas, DA CALTECH Jet Propuls Lab Pasadena CA 91109 USA

ISBN: (纸本)0819441554

We present a design and tolerancing approach that permits the achievement of a high degree of spatial and spectral uniformity of response from a pushbroom imaging spectrometer. Such uniformity of response is crucial for the extraction of accurate spectroscopic information from remotely sensed data. The spectrometer system example comprises two independent spectrometer modules covering the 400-2500 nm range, separated through a dichroic mirror. The relative merits of alternative approaches are briefly reviewed before concentrating on the problem of building a flight-worthy system that can approximate its design performance. The tolerancing approach requires simultaneous monitoring of many parameters, and specifically: overall image quality, spectral distortion, spectral MTF variation with field, spatial distortion, spatial MTF variation with wavelength, and slit magnification to within a small fraction of a pixel. It is shown that the wavefront error alone or even supplemented by distortion figures is insufficient for characterizing a system with high response uniformity. Tolerance values on the components and their positioning are primarily guided by the need to achieve the same magnification between the two spectrometer modules, as well as by the interferometric alignment method.

关键词： Tolerancing Spectrometers Short wave infrared radiation Beam splitters Mirrors Modulation transfer functions Distortion Image quality Point spread functions Wavefronts

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Scintillation bit error rate reduction for free space optical communications systems

Scintillation bit error rate reduction for free space optica...

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conference on current developments in lens design and optical engineering II

作者： Mayhew, LM Willebrand, H Kube, E LightPointe Commun Inc Boulder CO 80301 USA

ISBN: (纸本)0819441554

Although relatively unaffected by rain and snow, free space infrared laser optical communication systems are affected by fog and atmospheric turbulence. We have calculated the signal loss from scintillation to predict bit error rates by varying the amount of scintillation, the link distance, and system details. Increasing the number of transmitters and the effective area was predicted to improve scintillation in earlier work in this field.(1) We found that increasing both the number of transmitters and the effective receiver area greatly improved the signal loss caused by scintillation and thus, the bit error rate. For example, under high scintillation (Cn(2) = 10(-13) M,213), the four transmitter/receiver system at a link distance of 1 kin should experience a bit error rate of better than 10(-10) for a 4.0 dB loss. Under the same conditions, an identical system with only one transmitter and receiver should experience a bit error rate of 10(-1.5) (0.032 bits per second) for the same 4.0 dB loss. Increasing just the number of transmitters or the number of receivers improved the signal, but increasing both improved the signal even more than expected. In general, single beam systems should be limited to link distances less than about 600 m.

关键词： scintillation laser communications infrared bit error rate link budget

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design study of a 2.2x zoom lens using plastic materials

Design study of a 2.2x zoom lens using plastic materials

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conference on current developments in lens design and optical Systems engineering

作者： Shi, WM Newell, MP Fischer, RE OPT 1 Inc Westlake Village CA 91362 USA

No abstract available.

ISBN: (纸本)0819437387

No abstract available.

关键词： Zoom lenses Distortion Glasses Aspheric lenses lens design Vignetting Chemical elements Cameras Plastic lenses Chromatic aberrations

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Positioning accuracy of primary mirror actuators for large aperture space based optical instruments

Positioning accuracy of primary mirror actuators for large a...

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conference on current developments in lens design and optical Systems engineering

作者： Hatheway, AE Alson E Hatheway Inc Pasadena CA 91101 USA

ISBN: (纸本)0819437387

This paper describes the Rubicon(tm) actuator, discusses its test data and derives from the data the actuator's accuracy function based upon the observed accuracy of long and short stroke motion commands. The accuracy is described in terms of the rms positioning error (in nanometers) for moves of a given size, regardless of position in the stroke.

关键词： actuator nanometer space instruments accuracy move error

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lens centering by using binary phase grating

Lens centering by using binary phase grating

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conference on current developments in lens design and optical Systems engineering

作者： Lu, ZW Weng, ZC Changchun Inst Opt & Fine Mech State Key Lab Appl Opt Changchun 130022 Peoples R China

ISBN: (纸本)0819437387

By using a binary phase grating, a lens centering system is constructed. In our system, the lens under alignment is mounted on a suitable mechanical axis that can be a spindle of precision lathe. A binary phase grating is used as a beam splitter. Laser beam after passing through the grating only +/- 1 orders are kept unstop, reflected back by lens surface, recombined by the same grating, and very good contrast interference fringes can be attained. When the lens together with the spindle is rotated, the interference fringes remain motionless only when the lens rotates around its axis of symmetry. If the lens rotates around an axis of asymmetry, the fringes will move. A CCD camera is used to monitor the fringes and transversal error less than a micrometer can be achieved. The interference fringes are very insensitive to vibration and environment. In the paper the theory are presented and the experimental results are given.

关键词： centering interference binary phase grating

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Eyepiece design with refractive-diffractive hybrid elements

Eyepiece design with refractive-diffractive hybrid elements

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conference on current developments in lens design and optical Systems engineering

作者： Yun, ZS Lam, YL Zhou, Y Yuan, XC Zhao, LP Liu, J Nanyang Technol Univ Sch Elect & Elect Engn Photon Res Grp Singapore S639798 Singapore

ISBN: (纸本)0819437387

Eyepieces are a part of visual optical systems. Because of their wide field of view and long eye-relief, it is difficult to further improve the existing eyepieces using all-refractive surfaces. Since diffractive elements demonstrate unique characteristics: negative dispersion and non-field curvature, the eyepiece design can be improved by using refractive-diffractive hybrid surfaces. In this paper, several design examples using refractive-diffractive hybrid surfaces to design moderate field of view (FOV) eyepieces were studied. Firstly, a design example using a diffractive surface to replace the negative piece in the cement doublet of a conventional Kellner type eyepiece is presented. Then a design example is given by employing two diffractive elements to replace the negative elements used in the conventional symmetrical eyepiece. For the above examples the eyepiece aberration correction techniques were also analyzed.

关键词： optical design lens design diffractive optics eyepiece

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Opto-mechanical design of primary mirror assembly for free gyro stabilized seeker

Opto-mechanical design of primary mirror assembly for free g...

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conference on current developments in lens design and optical Systems engineering

作者： Perona, BJ Yarbrough, C Prill, S Raytheon Missile Syst Co Tucson AZ 85710 USA

ISBN: (纸本)0819437387

In Free Gyroscopic Stabilized Seekers, the Primary Minor has the multiple functions of a magnetic rotor, the primary rotating mass and the primary reflector for the optical train. The introduction of rare-earth magnetic alloys to this class of seeker has provided increased flexibility in materials selection, opto-mechanical design and cost of manufacture. Along with superior magnetic properties, the rare-earth alloy Neodymium-Iron-Boron (NdFeB) comes with the undesirable properties of anisotropic CTE, high susceptibility to corrosion and manufacturing challenges. This paper discusses the opto-mechanical design, structural and optical modeling and analysis of a primary mirror assembly utilizing an NdFeB insert with centrifugal, linear acceleration and thermal loading as well as the optical test results, qualification testing of long-term figure stability and validation of the mechanical/magnetic/optical design model.

关键词： opto-mechanical design gyroscope rare-earth magnet

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Minimizing gravity sag of a large mirror with an inverted Hindle-mount

Minimizing gravity sag of a large mirror with an inverted Hi...

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conference on current developments in lens design and optical Systems engineering

作者： Robinson, DW NASA Goddard Space Flight Ctr Greenbelt MD 20771 USA

ISBN: (纸本)0819437387

A method of minimizing the optical distortion from gravity sag on a suspended large autocollimating flat mirror has been devised. This method consists of an inverted nine-point Hindle-Mount. A conventional Hindle-Mount is located underneath a sky-viewing mirror and is primarily under compression loads from the weight of the mirror. It is not suitable for the situation where the mirror is viewing the ground, since a mirror would tend to fall out of the mount when in an inverted position. The inverted Hindle-Mount design consists of bonded joints on the backside of the mirror that allow the mirror to be held or suspended above an object to be viewed. This ability is useful in optical setups such as a calibration test where a flat mirror is located above a telescope so that the telescope may view a known optic.

关键词： Hindle mount optical mounting techniques bonding epoxy cell

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