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

共 530 条记录，以下是401-410 订阅

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Cryogenic optical design and testing of the Focal Plane Opto-Mechanical Assembly for the Tropospheric Emission Spectrometer

Cryogenic optical design and testing of the Focal Plane Opto...

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conference on current developments in lens design and optical systems engineering

作者： Crowther, BG Elwell, JD Anderson, RE Space Dynam Lab Logan UT 84341 USA

ISBN: (纸本)0819437387

The Tropospheric Emission Spectrometer (TES) is one of the instruments slated to fly on the EOS Aura satellite in 2003. TES is a Fourier transform spectrometer designed to measure the concentration of various tropospheric chemical species. The Focal Plane Opto-Mechanical Assemblies (FPOMAs) are situated at the end of the TES optical train and are comprised of cryogenic telescopes, reimaging optics, and focal planes. We present the cryogenic optical design of the FPOMA units and discuss optimization parameters and predicted performance. We present measured performance data and compare it with the predicted performance.

关键词： Tropospheric Emission Spectrometer TES Focal Plane Opto-Mechanical Assembly FPOMA optical design cryogenic performance

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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 a low-cost CCD-based camera

Optomechanical design of a low-cost CCD-based camera

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conference on current developments in lens design and optical systems engineering

作者： Ahmad, A Arndt, T Bomber, R Perez, R Rodriguez, H Panasiti, M Raytheon Missile Syst Tucson AZ 85734 USA

ISBN: (纸本)0819437387

Low-cost CCD-based cameras offer several cost and performance advantages for remote sensing applications. The optomechanical design of such cameras is inherently simple because zoom, gain and yaw corrections can be performed electronically, thereby, requiring no moving parts or mechanisms. This paper presents the optomechanical design and the results of structural and thermal analyses for a low-cost camera consisting of only three major parts: lens, electronics and camera housing. This camera uses a wide field of view lens with a fast f-number to acquire high-resolution images under various day and night time illumination scenarios. Passive athermal design of the lens maintains a high value of the MTF over a temperature range of 110 degreesC. Selection of the materials and adhesives used in this camera is dictated by a lifetime requirement of over 30 years under adverse environmental conditions. Structural and thermal modeling results confirm the survivability and performance of this camera under various shock, vibration and thermal loads.

关键词： CCD's MTF refractive optical systems passive athermalization low cost modular design thermoelectric cooler telecentric lens low light level camera

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Fisheye lens designs and their relative performance

Fisheye lens designs and their relative performance

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conference on current developments in lens design and optical systems engineering

作者： Kumler, J Bauer, M Coastal Opt Syst W Palm Beach FL 33407 USA

ISBN: (纸本)0819437387

New panoramic and immersive digital imaging developments have generated increased interest in high performance fisheye camera lenses suitable for 35 mm single lens reflex (SLR) cameras. Special concerns for such applications are the uniformity of illumination and radial image mapping. Because two hemispherical images are digitally stitched together to form a complete 360-degree x 180-degree image, the performance of the lens at the 90 degree (preferably more than 90 degree) edge of the fisheye image is just as important as the center of the image. Lateral color, high order distortion (edge compression) and severe drop-off of illumination at the full field become obvious image defects and cause seams in the immersive image. Fisheye lens designs have widely varying relative illumination and distortion across the hemispherical field of view of the lens. After describing the contributing factors to relative illumination, we survey a collection of fisheye designs and compare their illumination performance, radial mapping and lateral color. A new method of measuring relative illumination and radial mapping in the laboratory is described and results on commercially available fish-eye lenses are presented.

关键词： fisheye lenses optical design relative illumination distortion testing

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Lapping with loose abrasives in lens manufacturing

Lapping with loose abrasives in lens manufacturing

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conference on current developments in lens design and optical systems engineering

作者： Farsakoglu, OF Kocabas, H Bayar, M Zengin, DM Logist Command Tech Management Dept TR-06100 Ankara Turkey

ISBN: (纸本)0819437387

This study deals with lapping process with loose abrasives in large diameter lens manufacturing, Loose abrasive lapping, is a three-body abrasive process in which a fixed load is applied to a plate that presses a slurry consisting of a coolant and abrasive particles onto the optical surface being manufactured. This process is analyzed by examination of the influence of optical glass material parameters on material removal and surface roughness for lens manufacturing conditions. The model established for this analysis uses the concept of lateral fracture, which is based on removal of optical glass material by rolling abrasive particles. The particles remove glass material by lateral cracking. The concept of lateral fracture by rolling abrasive particles is verified as the lapping model, which was found to give a good description of the experimental results. Removal rates and lapping time values at the conventional removal depth are found and which will allow the automation of lapping process for lens manufacturing. The abrasive mineral Barton Garnet was used in the lapping experiments.

关键词： lens manufacturing optical glass lapping loose abrasive lateral crack surface roughness removal rate lapping time

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systems engineering analysis of image quality

Systems engineering analysis of image quality

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current developments in lens design and optical systems engineering

作者： Harvey, James E. Krywonas, A. Univ of Central Florida Orlando United States

A linear systems approach (multiplying MTFs or convolving PSFs) to performing a complete systems engineering analysis of image quality is described. This includes not only the traditional diffraction analysis and the evaluation of image degradation from residual design errors;but also includes image degradation due to scattering effects from residual optical fabrication errors, assembly and alignment errors, and all other potential error sources appearing in a detailed error budget tree. The effects of mosaic detector arrays upon systems performance and the optimum system design will also be discussed. This analysis allows optical fabrication tolerances to be determined during the design phase of a program, frequently resulting in substantial cost and schedule savings. Inaccuracies in the linear systems assumption will be presented for several different applications.

关键词： Image analysis

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Macro optical system for biological application

Macro optical system for biological application

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conference on current developments in lens design and optical systems engineering

作者： Kawano, Y Abe, C Abe, K Hayashi, K Hatta, Y Tamura, K Olympus Amer Inc Sci Equipment Grp Melville NY 11747 USA

ISBN: (纸本)0819437387

currently, the requirement of wide field view fluorescence observation is increasing in the biological field, but the existing microscopes have difficulty in imaging lower magnification fluorescence images. It is very easy to image in higher magnification with higher resolution and brightness using existing microscopes, but it is very difficult to image in lower magnification that are also bright. We focused on two applications in which a macro lens would be useful. The first application is DNA array reading. The second application is In Vivo imaging. Both applications require wide observation areas and bright images which are needed to lower magnification and fluorescence capability. The macro lens needs to have high numerical aperture (N..) and low magnification. We also believe if the macro lens can be attached to the existing microscopes, it will be quite useful to various applications because the scientists can then observe fluorescence images from low magnification to high magnification. To fulfill these needs, we designed macro objective lenses. Listed bellows are our macro lens' unique features. 1. Specification for the macro objective lenses are 2X, N. A. 0.14 and 4X, N. A. 0.28. These N. A. is higher than the existing microscope objective lenses of equal magnifications. 2. The 4X and 2X macro lens can be attached to existing microscopes. 3. These macro lenses can be used with the video lens such as 0.5X.

关键词： macro objective lens 4X 2X fluorescence

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Ultra-precision linear actuator for optical systems

Ultra-precision linear actuator for optical systems

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conference on current developments in lens design and optical systems engineering

作者： Nalbandian, R Moog Inc Schaeffer Magnet Div Chatsworth CA USA

ISBN: (纸本)0819437387

The Ultra-Precision Linear Actuator presented in this paper was developed for the Next Generation Space Telescope's (NGST) primary mirror surface figure control. The development was a joint effort between Alson E. Hatheway, Inc (AEH) and Moog, Schaeffer Magnetics Division(SMD)(1). The goal of this project was to demonstrate an extremely light weight, relatively high stiffness actuator capable of operating uniformly well over the range of 20 degreesK to 300 degreesK and achieving diffraction-limited performance (+/-10 nm) in the optical band for weeks at a time, while consuming no electrical power and dissipating no heat. The essence of the design challenge was to develop a lightweight, high stiffness, low power, thermally stable linear positioning mechanism. Actuation systems with resolutions comparable to that of this design normally are operated in a closed-loop control system to compensate for any non-linearities and hysteresis inherent in their enabling technologies, such as piezoelectric and magnetostrictive transducers. These technologies require continuous application of power and therefore are not low power consumption devices. The development challenge was met through the use of Alson E. Hatheway's (AEH) patented Rubicon elastic transducer(2) which consists of two elastic elements;a soft spring and a stiff flexural member. Deflection of the soft spring applies a force input to the stiff flexure, which responds with a proportionally reduced output deflection. To maintain linearity, the displacements, and hence the stresses, developed in both elastic members are kept well below the elastic yield strength of the material. The AEH transducer is inherently linear and hysteresis free.

关键词： linear actuator precision nanometer optical

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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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Inclusion of energetic features in wavefront descriptions

Inclusion of energetic features in wavefront descriptions

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conference on current developments in lens design and optical systems engineering

作者： Pizarro, C Arasa, J Royo, S Tomàs, N UPC Tech Univ Catalunya Ctr Dev Sensors Instrumentat & Syst CD6 E-08222 Terrassa Spain

ISBN: (纸本)0819437387

Different wavefront description possibilities are today available to the optical designer, usually in the form of polynomial fitting (Seidel, Zernike, monomials...). This kind of representations have the general drawback of being based merely in the geometrical shape of the wavefront considered, calculated as a distribution of optical path differences, without taking into account the energetic distribution present in the wavefront. As a consequence, optimization of optical systems is carried on based only on geometrical criterions, while applications tend to rely more on energetic properties of the wavefront (detection on CCD arrays or photodiodes, image formation, etc). In this paper we are proposing a new type of wavefront descriptor which includes its energetic distribution. The description is based on classical ray tracing procedures, in such a way that in each surface normal to the axis of the optical system, information on the position (z,y) and director cosines (w,v) of the ray are known, together with the energy flux assigned to each ray (F). This allows obtaining the energetic distribution in any plane in the optical system together with the classical wavefront description based in OPD calculations, allowing to obtain complementary wavefront information. This complementary wavefront description has been applied to some simple optical systems (a large diameter cemented achromatic doublet, and a Cooke's triplet) showing how even in these very simple case the differences in the energetic distribution and the geometrical shape at the exit pupil plane are relevant. Such a fact is demonstrated by least-squares fitting of the surfaces to a monomial representation, allowing the determination of the different primary aberration coefficients. Finally, differences in the geometrical PSF and the energetic distribution calculated are plotted to show they may achieve maximum deviations of up to 11% of the PSF value for the doublet, and 25% for the triplet. In addition, t

关键词： optical design wavefront descriptor optimization radiometry

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