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

共 444 条记录，以下是181-190 订阅

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Evaluation of deep learning-generated lens design starting points 11

Evaluation of deep learning-generated lens design starting p...

引用

conference on current developments in lens design and optical engineering XXI

作者： Cote, Geoffroi Lalonde, Jean-Francois Thibault, Simon Univ Laval Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Lab Vis & Syst Numer Quebec City PQ G1V 0A6 Canada

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

Data-driven approaches to lens design have only recently begun to emerge. One particular way in which machine learning, and more particularly deep learning, was applied to lens design was by smoothly extrapolating from lens design databases to provide high-quality starting points for lens designers. This mechanism is used by the web application lensNet (which will be publicly available shortly) whose goal is to provide high-quality starting points that are tailored to the desired specifications, namely the effective focal length, f-number and half field of view. Here, we evaluate more thoroughly the designs that are inferred by lensNet and its underlying deep neural network. We provide a global quantitative assessment of the viability of the designs as well as a more targeted comparison among specific design families such as Cooke triplets and Double-Gauss lenses between expert-designed lenses and their automatically inferred counterparts.

关键词： lens design machine learning deep learning lens design optimization

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optical spherometer for measuring large curvature radii of convex surfaces 18

Optical spherometer for measuring large curvature radii of c...

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conference on current developments in lens design and optical engineering xviiI

作者： Alvarado Martinez, Jorge de Jesus Vazquez y Montiel, Sergio Camacho Bello, Cesar Joel Univ Politecn Tulancingo Tulancingo Hgo Mexico Univ Interserrana Estado Puebla Puebla Mexico

ISBN: (纸本)9781510612082;9781510612075

Measuring large curvature radii of convex surfaces with high precision is a challenge because the spherometer's focus must be positioned at the apex of the surface and at the center of curvature of the surface by moving the surface or the spherometer. If the radius of curvature is larger than the back focus of spherometer, then measurement is not possible. In this work, we propose to use the FOCOIVA system1 to move the focus of the spherometer in longitudinal way without modifying the f number by moving two lenses inside it, with this mechanism it is possible to measure radii of curvature of several meters in length. The curves of movement of the lenses and the optical parameters of the lenses that compose the spherometer are presented.

关键词： optical design spherometer radii of curvature convex surfaces

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Thermal optical Path Difference Analysis of Off-Axis lens Ray Trace Foot-Print at Cassegrain telescope correct lens assembly

Thermal Optical Path Difference Analysis of Off-Axis Lens Ra...

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conference on current developments in lens design and optical engineering XIII

作者： Hsu, Ming-Ying Lin, Yu-Chuan Chan, Chia-Yen Lin, Wei-Cheng Chang, Shenq-Tsong Huang, Ting-Ming Natl Appl Res Labs Instrument Technol Res Ctr Hsinchu 300 Taiwan

ISBN: (纸本)9780819492036

The Cassegrain telescope system in this study, is discussion correct lens thermal OPD (optical Path Difference) effect optical performance. The correct lens assembly are includes several components such as correct lens, lens mount, spacer, mount barrel and retainer. The heat transfer from surrounding to the correct lens barrel will causes optical system aberration. Meanwhile, the off-axis rays path of the OPD must consider lens incidence point and emergence point. The correct lens temperature distribution is calculate the lens barrel heat transfer analysis, the thermal distortion and stress are solve by FEM (Finite Element Method) software. The temperature calculation results can be weighting to each incidence ray path and calculate thermal OPD. The thermal OPD on Z-direction can be fitted by rigid body motion and Zernike polynomial. The fitting results can be used to evaluate the thermal effect on correct lens assembly in telescope system.

关键词： OPD FEM Ray trace Off-axis Correct lens

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Fundamental and specific steps in Shack-Hartmann wavefront sensor design

Fundamental and specific steps in Shack-Hartmann wavefront s...

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conference on current developments in lens design and optical engineering VII

作者： Curatu, Costin Curatu, George Rolland, Jannick Univ Cent Florida CREOL FPCE Coll Opt & Photon Orlando FL 32816 USA

ISBN: (纸本)0819463671

Shack-Hartmann sensors are widely used to measure wavefront aberrations. We present the fundamental and specific engineering steps in the design of Shack-Hartmann wavefront sensors. Typical performance requirements such as sensor dynamic range, sensitivity and accuracy are defined and discussed. We investigate the trade-offs between these performance metrics and the factors affecting the trade-offs. A first order approach for selecting the optimal parameters of the sensor central piece, the lenslet array, is presented. We also propose a quick tolerance analysis method that can predict the wavefront measurement error due to misalignments, using only the ray-tracing software.

关键词： wavefront sensing Shack-Hartmann sensor tolerance analysis

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optical encoder based on a non diffractive beam

Optical encoder based on a non diffractive beam

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conference on current developments in lens design and optical engineering VIII

作者： Lutenberg, A. Perez Quintian, F. Rebollo, M. A. Univ Buenos Aires Fac Ingn Lab Aplicac Opt Av Paseo Colon 850 Buenos Aires DF Argentina

ISBN: (纸本)9780819468154

Nowadays most industrial and laboratory motion measuring equipment makes use of optical encoders to measure rotation and linear displacements with sub-micrometrical resolution. In this work we introduce a new design of an optical encoder based on a non diffractive beam, a binary amplitude grating and a monolithic photodetector. Two theoretical models of the system are proposed and implemented to obtain numerical results. The performance of the design is also investigated through experimental measurements. Finally, the experimental results are compared with the models predictions.

关键词： metrology optical encoder sub-micrometric resolution non diffractive beam gratings

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Diffraction depth of focus in optical microscope

Diffraction depth of focus in optical microscope

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conference on current developments in lens design and optical engineering XI - and Advances in Thin Film Coatings VI

作者： Borovytsky, Volodymyr Fesenko, Andrey Nat Techn Univ Ukraine KPI Opt Eng Dept UA-03056 Kiev Ukraine

ISBN: (纸本)9780819482822

The paper presents the mathematical technique for calculation of the diffraction depth of focus of an optical system of a widefield microscope. The proposed technique applies the Rayleigh criterion based on evaluation of the wave aberration appeared due to defocus in a high aperture optical system. The maximal value of a linear approximation of the defocus wave aberration is used to define the depth of focus. It is proven that in optical systems with numerical aperture higher than 0.5 have the diffraction depth of focus 25 - 40% smaller than the widely known formula defines. This fact is important for implementation of autofocus and digital focus extension algorithms. The non-sophisticated formula for calculation of the depth of focus is proposed. The results of experimental measurements of the depth of focus are presented and discussed.

关键词： depth of focus wave aberration image quality Rayleigh criterion Marechal criterion

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Introducing the quantum efficiency of fluorescence of SCHOTT optical glasses 18

Introducing the quantum efficiency of fluorescence of SCHOTT...

引用

conference on current developments in lens design and optical engineering xviiI

作者： Jedamzik, Ralf Elsmann, Frank Engel, Axel Petzold, Uwe Pleitz, Jana Schott AG D-55122 Mainz Germany

ISBN: (纸本)9781510612082;9781510612075

The fluorescence of optical glasses is a property that needs to be taken into account in optical designs for life science applications. Many optical glasses from SCHOTT show a very low intrinsic or auto-fluorescence. The fluorescence depends mainly on the applied excitation wavelength and the optical glass type. The fluorescence of optical glasses is usually defined as the quotient of the integral of the emission spectrum with the integral of the emission spectrum of a reference glass. This definition does not give any information about the actual quantum efficiency of the fluorescence. In this presentation recent data on the integral fluorescence of SCHOTT optical glasses are presented. Additionally, first measurements of the quantum efficiency of SCHOTT optical glasses are presented and compared to the standard method.

关键词： Glasses Luminescence Quantum efficiency Biomedical optics Life sciences Space telescopes Visual optics Lithography Microscopy optical design

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Plane development of lateral surfaces for inspection systems

Plane development of lateral surfaces for inspection systems

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conference on current developments in lens design and optical engineering VII

作者： Francini, F. Fontani, D. Jafrancesco, D. Mercatelli, L. Sansoni, P. Ist Nazl Ott Appl L Go E Fermi 6 I-50125 Florence Italy

ISBN: (纸本)0819463671

The problem of developing the lateral surfaces of a 3D object can arise in item inspection using automated imaging systems. In an industrial environment, these control systems typically work at high rate and they have to assure a reliable inspection of the single item. For compactness requirements it is not convenient to utilise three or four CCD cameras to control all the lateral surfaces of an object. Moreover it is impossible to mount optical components near the object if it is placed on a conveyor belt. The paper presents a system that integrates on a single CCD picture the images of both the frontal surface and the lateral surface of an object. It consists of a freeform, lens mounted in front of a CCD camera with a commercial lens. The aim is to have a good magnification of the lateral surface, maintaining a low aberration level for exploiting the pictures in an image processing software. The freeform lens, made in plastics, redirects the light coming from the object to the camera lens. The final result is to obtain on the CCD: - the frontal and lateral surface images, with a selected magnification (even with two different values for the two images);- a gap between these two images, so an automatic method to analyse the images can be easily applied. A simple method to design the freeform lens is illustrated. The procedure also allows to obtain the imaging system modifying a current inspection system reducing the cost.

关键词： optical design freeform optics industrial control optical component

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New tools for the design of freeform mirrors 18

New tools for the design of freeform mirrors

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conference on current developments in lens design and optical engineering xviiI

作者： Dilworth, Donald C. Opt Syst Design Inc POB 247 East Boothbay ME 04544 USA

ISBN: (纸本)9781510612082;9781510612075

Advances in manufacturing and measuring technology are making the use of freeform mirrors more practical than in the recent past. New degrees of freedom make it possible for designers to improve image quality while increasing the field of view and avoiding obscurations. But other issues arise when one designs a system with several mirrors, particularly packaging and clearance concerns: one must ensure that none of the mirrors gets in the way of the beam from any of the others, and one must consider the coordinate system in which the shapes are defined and in which they are measured, which are not necessarily the same. Addressing these concerns requires new computational tools.

关键词： Freeform aspheric mirrors beam clearance at mirrors

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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...

引用

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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