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

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A lazy way to design infrared lens 18

A lazy way to design infrared lens

引用

Conference on current developments in lens design and optical engineering xviiI

作者： Qiu, RongSheng Wu, JianDong Chen, LongJiang Yu, Kun Pang, HaoJun Hu, BaiZhen Shanghai Aerosp Control Technol Inst 1555 ZhongChun Rd Shanghai 201109 Peoples R China

ISBN: (纸本)9781510612082;9781510612075

We designed a compact middle-wave infrared (MWIR) lens with a large focal length ratio ( about 1.5:1), used in the 3.7 to 4.8 mu m range. The lens is consisted of a compact front group and a re-imaging group. Thanks to the compact front group configuration, it is possible to install a filter wheel mechanism in such a tight space. The total track length of the lens is about 50mm, which includes a 2mm thick protective window and a cold shield of 12mm. The full field of view of the lens is about 3.6 degrees, and F number is less than 1.6, the image circle is about 4.6mm in diameter. The design performance of the lens reaches diffraction limitation, and doesn't change a lot during a temperature range of -40 degrees C+60 degrees C This essay proposed a stepwise design method of infrared optical system guided by the qualitative approach. The method fully utilize the powerful global optimization ability, with a little effort to write code snippet in optical design software, frees optical engineer from tedious calculation of the original structure.

关键词： infrared optical system lens design athermalization filter wheel multispectral sensing

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Achieving linearity with an optical quadrant detector tracking system 18

Achieving linearity with an optical quadrant detector tracki...

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Conference on current developments in lens design and optical engineering xviiI

作者： Doherty, Victor J. Aouani, Dina Eidolon Opt LLC 3 Erie Dr Natick MA 01760 USA

ISBN: (纸本)9781510612082;9781510612075

Conventional round spot quadrant detector trackers are inherently non-linear. This non-linearity requires multiple iterations to converge onto perfect alignment with the object tracked. We created a system that generates a square spot. The convolution of a square spot with a circle, generated by the quadrant detector, allows this spot to achieve perfect alignment in one iteration. This invention is thus essential to any system that requires speed and accuracy. In this paper, we introduce the theory behind the square spot as well as the design of our linear optical quadrant detector tracking technology.

关键词： Quadrant Detector optical Tracking Sun Tracking Solar Surgery Square Spot

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Combining the transformation and the integration methods to design a refractive lens-array for signal lighting applications 18

Combining the transformation and the integration methods to ...

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Conference on current developments in lens design and optical engineering xviiI

作者： Essameldin, Mahmoud Fleischmann, Friedrich Henning, Thomas Lang, Walter Bremen Univ Appl Sci Fac Elect Engn & Comp Sci 30 Neustadtswall D-28199 Bremen Germany Univ Bremen Inst Microsensors Actuators & Syst Otto Hahn AlleeGebaude NW 1 D-28359 Bremen Germany

ISBN: (纸本)9781510612082;9781510612075

The design of a secondary optical lens for light beam shaping using the transformation method is performed by transforming the light source energy distribution using the concepts of energy conservation and light energy mapping. Using these concepts creates a dependency relation between the output optical performance and the luminous intensity distribution of the light source. This relation leads to errors on the optical performance due to the fabrication misalignment between the light source and the secondary optical lens. On the other hand, in the illumination applications, the integration method has been proved to be an efficient method for achieving a high degree of homogenized luminous intensity distribution by integrating and superimposing the light source energy over the illuminated objects. In signal lighting applications, the luminous intensity distribution must meet the requirements regarding the brightness perception of users over the spatial angular distribution, not the illumination of objects. In this paper, the integration method is combined with the transformation method to design a refractive lens-array for signal lighting applications. The difference between the two methods is described, presenting the advantages of the combination process. design procedures are explained in detail including the lens-array modeling. The optical performance is investigated using an optical ray tracing. Finally, the influence of the misalignment between the light source and the refractive lens-array is measured.

关键词： optical design Signal Lighting Beam-shaping

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Introducing the quantum efficiency of fluorescence of SCHOTT optical glasses 18

Introducing the quantum efficiency of fluorescence of SCHOTT...

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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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Using a two-lens afocal compensator for thermal defocus correction of catadioptric system 18

Using a two-lens afocal compensator for thermal defocus corr...

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Conference on current developments in lens design and optical engineering xviiI

作者： Ivanov, S. E. Romanova, G. E. Bakholdin, A. V. St Petersburg Natl Res Univ Informat Technol Mech 49 Kronverksky Prospekt St Petersburg 197101 Russia

ISBN: (纸本)9781510612082;9781510612075

The work associates with the catadioptric systems with two-component afocal achromatic compensator. The most catadioptric systems with afocal compensator have the power mirror part and the correctional lens part. The correctional lens part can be in parallel, in convergent beam or in both. One of the problems of such systems design is the thermal defocus by reason of the thermal aberration and the housing thermal expansion. We introduce the technique of thermal defocus compensation by choosing the optical material of the afocal compensator components. The components should be made from the optical materials with thermo-optical characteristics so after temperature changing the compensator should become non-afocal with the optical power enough to compensate the image plane thermal shift. Abbe numbers of the components should also have certain values for correction chromatic aberrations that reduces essentially the applicable optical materials quantity. The catalogues of the most vendors of optical materials in visible spectral range are studied for the purpose of finding the suitable couples for the technique. As a result, the advantages and possibilities of the plastic materials application in combination with optical glasses are shown. The examples of the optical design are given.

关键词： Afocal compensator athermalization catadioptric system optical material

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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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optical design of an athermalised dual field of view step zoom optical system in MWIR 18

Optical design of an athermalised dual field of view step zo...

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Conference on current developments in lens design and optical engineering xviiI

作者： Kucukcelebi, Doruk Roketsan Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu Soka TR-06780 Ankara Turkey

ISBN: (纸本)9781510612082;9781510612075

In this paper, the optical design of an athermalised dual field of view step zoom optical system in MWIR (3.7 mu m-4.8 mu m) is described. The dual field of view infrared optical system is designed based on the principle of passive athermalization method not only to achieve athermal optical system but also to keep the high image quality within the working temperature between -40 degrees C and + 60 degrees C. The infrared optical system used in this study had a 320 pixel x 256 pixel resolution, 20 mu m pixel pitch size cooled MWIR focal plane array detector. In this study, the step zoom mechanism, which has the axial motion due to consisting of a lens group, is considered to simplify mechanical structure. The optical design was based on moving a single lens along the optical axis for changing the optical system's field of view not only to reduce the number of moving parts but also to athermalize for the optical system. The optical design began with an optimization process using paraxial optics when first-order optics parameters are determined. During the optimization process, in order to reduce aberrations, such as coma, astigmatism, spherical and chromatic aberrations, aspherical surfaces were used. As a result, athermalised dual field of view step zoom optical design is proposed and the performance of the design using proposed method was verified by providing the focus shifts, spot diagrams and MTF analyzes' plots.

关键词： Dual field of view step zoom optical design paraxial optics athermalization Mid Wave Infrared (MWIR)

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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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Zoom system without moving element by using two liquid crystal lenses with spherical electrode 18

Zoom system without moving element by using two liquid cryst...

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Conference on current developments in lens design and optical engineering xviiI

作者： Yang, Ren-Kai Lin, Chia-Ping Su, Guo-Dung J. Natl Taiwan Univ Grad Inst Photon & Optoelect 1Roosevelt RdSect 4 Taipei Taiwan

ISBN: (纸本)9781510612082;9781510612075

A traditional zoom system is composed of several elements moving relatively toward other components to achieve zooming. Unlike tradition system, an electrically control zoom system with liquid crystal (LC) lenses is demonstrated in this paper. To achieve zooming, we apply two LC lenses whose optical power is controlled by voltage to replace two moving lenses in traditional zoom system. The mechanism of zoom system is to use two LC lenses to form a simple zoom system. We found that with such spherical electrodes, we could operate LC lens at voltage range from 31V to 53 V for 3X tunability in optical power. For each LC lens, we use concave spherical electrode which provide lower operating voltage and great tunability in optical power, respectively. For such operating voltage and compact size, this zoom system with zoom ratio approximate 3: 1 could be applied to mobile phone, camera and other applications.

关键词： replication process liquid crystal lens zoom system

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Diffraction and geometrical optical transfer functions: calculation time comparison 18

Diffraction and geometrical optical transfer functions: calc...

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Conference on current developments in lens design and optical engineering xviiI

作者： Antonio Diaz, Jose Mahajan, Virendra N. Univ Granada Dept Opt E-18071 Granada Spain Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9781510612082;9781510612075

In a recent paper, we compared the diffraction and geometrical optical transfer functions (OTFs) of an optical imaging system, and showed that the GOTF approximates the DOTF within 10% when a primary aberration is about two waves or larger [Appl. Opt., 55, 3241-3250 (2016)]. In this paper, we determine and compare the times to calculate the DOTF by autocorrelation or digital autocorrelation of the pupil function, and by a Fourier transform (FT) of the point-spread function (PSF);and the GOTF by a FT of the geometrical PSF and its approximation, the spot diagram. Our starting point for calculating the DOTF is the wave aberrations of the system in its pupil plane, and the ray aberrations in the image plane for the GOTF. The numerical results for primary aberrations and a typical imaging system show that the direct integrations are slow, but the calculation of the DOTF by a FT of the PSF is generally faster than the GOTF calculation by a FT of the spot diagram.

关键词： optical transfer function aberrations geometrical OTF diffraction OTF imaging

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