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共 338 条记录，以下是101-110 订阅

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optical design of rotational symmetric triangulation sensors with low cost detectors based on reflective optics

Optical design of rotational symmetric triangulation sensors...

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conference on optical Measurement systems for Industrial Inspection III

作者： Ott, P Univ Appl Sci Heilbronn D-74081 Heilbronn Germany

ISBN: (纸本)0819450146

Classical triangulation sensors exhibit a orientation depend signal if the scattering properties of the work-piece are not symmetrical like at curved surface locations. This problem is avoided by rotational symmetric triangulation sensors. Due to this attractive property in a lot of applications such a sensor was introduced very recently on the market. This sensor is based on refractive optics and a special PSD detector, both custom made resulting in high costs. Additionally, the existing optical design approach does not offer an optical layout to start with, thus a good amount of trial and error is required and non-optimal solutions are probable. Therefore, there is great interest for a clear optical design strategy that results in layouts that are suitable also to use low cost commercial available detectors, such as CCD or CMOS image detectors. In this paper such a design procedure is presented for optical designs that use reflecting optical surfaces. Several solutions are depicted and discussed. The designs are not only attractive from the optical point of view and from detector considerations, but also from opto-mechanical design issues. For example designs with only one opto-mechanical part are possible. The resulting optical designs consist of aspherical surfaces which are obtained directly by using only some new relations of first order optics for off-axis objects. The designs are validated by exact ray tracing. These ray tracing results show already very good performance. Nevertheless, it was possible to further optimize the optical designs very efficiently using ray tracing software, thus yielding improved optical properties.

关键词： optical sensors

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Hands-on project aimed at technical education - realizing a dc magnetron sputtering system 24

Hands-on project aimed at technical education - realizing a ...

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conference on Novel optical systems, Methods, and Applications XXIV part of spie optical Engineering + Applications conference

作者： Massahi, S. Ferreira, D. D. M. Avngaard, Michael H. Christensen, A. B. Haugbolle, D. T. Jensen, K. W. Mejnertz, I. F. Selsner, J. S. Westermann, M. J. Fleron, R. Christensen, F. E. Gellert, N. Svendsen, S. Henriksen, P. L. Jegers, A. S. Tech Univ Denmark DTU Space Elektrovej Bldg 327-328 DK-2800 Lyngby Denmark

ISBN: (数字)9781510644694

ISBN: (纸本)9781510644694;9781510644687

We present a teaching concept which combines theory, experimental work, project management and organization. As part of the Earth and Space Physics and Engineering education at DTU Space, a group of first year undergraduate students were given the task to design, build and test a DC magnetron sputtering system within a very limited budget and time frame. The teaching concept is designed to promote the students' autonomous learning, and a major part of the project was to teach the students how to develop group dynamics successfully. The students successfully managed to build a direct current magnetron sputtering system wherein a plasma glow was produced. The system can be used for depositing thin film coatings, an enabling technology for numerous applications.

关键词： dc magnetron sputtering X-ray optics DTU Space Teaching Engineering work

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Application-adapted beam shaping with cutting-edge optical elements in laser materials processing 12

Application-adapted beam shaping with cutting-edge optical e...

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conference on High-Power Laser Materials Processing - Applications, Diagnostics, and systems XII

作者： Voell, A. Buske, P. Stollenwerk, J. Holly, C. Rhein Westfal TH Aachen Chair Technol Opt Syst TOS Steinbachstr 15 D-52074 Aachen Germany Fraunhofer Inst Laser Technol ILT Steinbachstr 15 D-52074 Aachen Germany

ISBN: (纸本)9781510659339;9781510659346

The quality, efficiency and robustness of laser materials processing significantly benefits from an application-adapted beam shaping. For a successful realization of tailored beam shapes that utilizes state-of-the-art optic concepts, research in two different steps is necessary. First, information about the required beam shape (especially in terms of intensity distribution) is needed. During the last years, we have developed and validated a method to solve the so-called inverse heat conduction problem which enables the derivation of an intensity distribution that specifically tailors the induced temperature profile within the processed material. Here, we present the latest enhancement of the algorithm to complex time-dependent scenarios and new applications, e.g. from the field of surface treatment and tape placement. With the knowledge of the target beam shape, in a second step, optical systems must be designed that enable the realization of the achieved, highly complex intensity distributions. We further demonstrate the potential and limits of novel optics such as freeform mirrors, LCoS-SLMs or diffractive neural networks as well as VCSELs for application-adapted beam shaping. We especially present specific design methods that can contribute to a robust, flexible, and practical realization in various applications.

关键词： Laser beam shaping optics design numerical simulation inverse heat conduction problem diffractive neural networks freeform optics computational optics

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JWST-MIRI spectrometer main optics qualification and verification

JWST-MIRI spectrometer main optics qualification and verific...

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conference on Cryogenic optical systems and Instruments XII

作者： Meijers, Michael Oudenhuysen, Ad Schoenmaker, Ton Kroes, Gabby Jager, Rieks Pauwels, Evert ASTRON Oude Hoogeveensedijk 4 NL-7991 PD Dwingeloo Netherlands Netherlands Res Sch Astron NOVA Leiden Netherlands PiE BV NL-2231 MJ Rijnsburg Netherlands

ISBN: (纸本)9780819468406

MIRI ('Mid Infrared Instrument') is the combined imager and integral field spectrometer for the 5-29 micron wavelength range under development for the JWST. In March 2007 the qualification and verification phase of the Spectrometer Main optics (SMO), part of the MIRI spectrometer came to an end. In this phase it is shown that the SMO subsystem can provide the necessary performance and withstand the harsh environments of a launch and outer space. In this phase different models of the SMO have been inspected with respect to performance parameters like alignment and image quality and have been exposed to vibration tests and successive cryogenic cool downs. This paper will describe the philosophy behind the verification plan, the chosen test strategy and reports the results of these tests. In addition the paper covers the design of the optical test setup, focusing on the simulation of the optical interfaces of the SMO.

关键词： development JWST MIRI spectrometer

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Evidence supporting the primacy of Joseph Petzval in the discovery of aberration coefficients and their application to lens design

Evidence supporting the primacy of Joseph Petzval in the dis...

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10th conference on Novel optical systems design and Optimization

作者： Rakich, Andrew Wilson, Raymond LBT Observatory 933 N Cherry Ave Tucson AZ 85721 USA ESO D-85296 Rohrbach Germany

ISBN: (纸本)9780819468161

In 1839 Louis Daguerre published his process for permanently fixing optical images, and created an instant need for a high-aperture, relatively wide-field and well-corrected lens. Within a year, an optical design meeting all of these requirements was provided by Professor Joseph Petzval, a mathematician with no previous background in optics. This optical design was revolutionary in that it was well corrected for aberration over a wide-field at the unprecedented speed of f/3.5. As Petzval never published explicit details of his method for designing lenses, the credit for the invention of an aberration theory applicable to lens design has gone in the first place to Seidel, and later to those who developed high-order coefficients such as Schwarzschild, T Smith and Buchdahl. It is the contention of this paper that this has been an historical injustice, and that sufficient evidence exists, and indeed has existed in part since well before Seidel published his derivation of third-order aberration coefficients, to establish Petzval as the original pioneer of third-and-higher-order aberration theory as a tool for lens design.

关键词： Petzval aberration theory

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Simultaneous Multiple Surfaces method applied to infrared lenses 23

Simultaneous Multiple Surfaces method applied to infrared le...

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conference on Current Developments in Lens design and optical Engineering XXIII part of spie optics and Photonics conference

作者： Mayeur, T. Volatier, J. B. Druart, G. Tartas, E. Durand, A. Cau, F. Off Natl Etud & Rech Aerosp 6 Chemin Vauve Granges F-91120 Palaiseau France Lynred 364 Route Valence F-38113 Veurey Voroize France Safran Elect & Def 100 Ave Paris F-91300 Massy France

ISBN: (纸本)9781510654198;9781510654181

In optical design, the designer's experience is critical. Indeed, an experienced optical designer will often choose a better starting point for optimization than an inexperienced one. Most of the time, lens design software use a local optimization algorithm, which is why the starting point is so important to get an excellent optical system. We present here an alternative to the classical optical design method and a solution to reduce the impact of the designer's experience. Our alternative couples the Simultaneous Multiple Surfaces (SMS) method, introduced by Benitez and Minano with optimization in Zemax opticstudio. The SMS method is a direct construction method of optical systems without optical aberrations for as many field points as the system contains surfaces. This method can deal with both aspheric and freeform optical systems depending on the dimension of the method implemented. Our implementation of the SMS method can design optical systems with three surfaces. We use the SMS method to define a freeform system with an F-number of 0.85. Then, we use this fast freeform system as a starting point to perform further optimization in Zemax opticstudio. Finally, we achieve to design two diffraction-limited freeform systems, one over a square field of view of +/- 30 degrees and another over a rectangular field of view of +/- 33 degrees x +/- 26 degrees.

关键词： Simultaneous Multiple Surfaces freeform surfaces Cartesian oval automated method optical design

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Methods of tolerancing injection-molded parts for illumination systems

Methods of tolerancing injection-molded parts for illuminati...

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conference on design of Efficient Illumination systems

作者： Kaminski, ME Koshel, RJ Breault Res Org Inc Tucson AZ 85715 USA

ISBN: (纸本)0819450596

Injection-molded optical components are used often for commercial illumination systems. This paper discusses methods of how to model the tolerance aspects of such components. Tolerance aspects include surface roughness, source-to-optic position and rotation errors, and surface slope errors. It is noted that all of these tolerance investigations cannot correctly account for errors in the injection-mold process. A method to model deformations induced in the injection-mold process is proposed. The method is based on the laser scan of an injection-molded part, which allows the rebuilding of the surface from the point cloud. This method, while quite accurate, is time consuming, so a second algorithm based upon approximation with a Harvey scatter model is developed that takes over an order of magnitude less in time. It is shown that the approximate model provides results within a few percent if comparisons are done in the far field. Near-field results require the rebuild method that uses the measured point cloud. Additionally, illumination systems comprising multiple interactions with the component surface (e.g., lightpipes) can use the approximate Harvey model.

关键词： illumination nonimaging optics optical design tolerancing Harvey model injection molding

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optical design for LED dental lighting based on imaging optic technique

Optical design for LED dental lighting based on imaging opti...

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conference on Novel optical systems design and Optimization XIV

作者： Kwon, Young-Hoon Bae, Seung-Chul Lim, Hae-Ryong Jang, Ja-Soon LED IT Fus Technol Res Ctr 214-1 Dae Dong Gyongsan 712749 Gyeongsangbuk D South Korea Yeungnam Univ Dept Elect Engn Gyongsan 712749 Gyeongsangbuk D South Korea

ISBN: (纸本)9780819487391

We did a research as follows. First of all, selected optimum LEDs and mixed it for higher CRI, target CCT and illuminance. The following step is optical module design. Light directional characteristics of dental lighting must be concentrated to illuminate a part. Because This part is oral cavity, The feature of illumination pattern is rectangular. For uniformity of illuminance and clearer pattern boundary at reference distance, we designed it as direct type ( no use reflector) by imaging optic technique. First, Image is rectangular feature, so object must be the same feature with magnification in general imaging optics. But the emitting surface feature of LED (1W grade) is square or circular generally. For that reason, made object as rectangular source with rectangular lightguide. This optical component was designed for higher efficiency by illumination optic technique. Next, we designed optical lenses based on imaging optic technique for image object feature using Code V. set to high NA for light efficiency in this design.. Fundamentally, Finally, This product is luminaire so illumination simulation and result analysis were executed by LightTools as illumination design software.

关键词： Dental lighting High CRI LED optical system

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Characterization and Modelling of the Spatially- and Spectrally-Varying Point-Spread Function in Hyperspectral Imaging systems for computational Correction of Axial optical Aberrations

Characterization and Modelling of the Spatially- and Spectra...

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conference on design and Quality for Biomedical Technologies V

作者： Spiclin, Ziga Buermen, Miran Pernus, Franjo Likar, Bostjan Univ Ljubljana Fac Elect Engn Lab Imaging Technol Ljubljana 1000 Slovenia

ISBN: (纸本)9780819488589

Spatial resolution of hyperspectral imaging systems can vary significantly due to axial optical aberrations that originate from wavelength-induced index-of-refraction variations of the imaging optics. For systems that have a broad spectral range, the spatial resolution will vary significantly both with respect to the acquisition wavelength and with respect to the spatial position within each spectral image. Variations of the spatial resolution can be effectively characterized as part of the calibration procedure by a local image-based estimation of the point-spread function (PSF) of the hyperspectral imaging system. The estimated PSF can then be used in the image deconvolution methods to improve the spatial resolution of the spectral images. We estimated the PSFs from the spectral images of a line grid geometric caliber. From individual line segments of the line grid, the PSF was obtained by a non-parametric estimation procedure that used an orthogonal series representation of the PSF. By using the non-parametric estimation procedure, the PSFs were estimated at different spatial positions and at different wavelengths. The variations of the spatial resolution were characterized by the radius and the full-width half-maximum of each PSF and by the modulation transfer function, computed from images of USAF1951 resolution target. The estimation and characterization of the PSFs and the image deconvolution based spatial resolution enhancement were tested on images obtained by a hyperspectral imaging system with an acousto-optic tunable filter in the visible spectral range. The results demonstrate that the spatial resolution of the acquired spectral images can be significantly improved using the estimated PSFs and image deconvolution methods.

关键词： Hyperspectral imaging optical aberration calibration point-spread function deconvolution

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MAVIS: preliminary design overview of the natural guide star wavefront sensor submodule 8

MAVIS: preliminary design overview of the natural guide star...

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conference on Adaptive optics systems VIII part of spie Astronomical Telescopes and Instrumentation conference

作者： Bonaglia, Marco Agapito, Guido Aliverti, Matteo Azzaroli, Nicole Briguglio, Runa Busoni, Lorenzo Capasso, Giulio Carbonaro, Luca Colapietro, Mirko Del Vecchioa, Ciro D'Orsi, Sergio Doniselli, Simone Grani, Paolo Greggio, Davide Lapucci, Tommaso Plantet, Cedric Pinna, Enrico Puglisi, Alfio Rossi, Fabio Savarese, Salvatore Schipani, Pietro Selmi, Chiara Viotto, Valentina Rigaut, Francois INAF Osservatorio Astrofis Arcetri Florence Italy INAF Osservatorio Astronom Brera Brera Italy INAF Osservatorio Astronom Capodimonte Naples Italy INAF Osservatorio Astronom Padova Padua Italy Australian Natl Univ Canberra ACT Australia

ISBN: (纸本)9781510653528;9781510653511

The paper describes the design of the NGS WFS sub-module of MAVIS, an instrument for the VLT UT4 that aims to provide diffraction limited imaging and spectroscopy at visible wavelengths. In this framework the NGS WFS provides means for the tomographic measurement of the lower-orders of the atmospheric turbulence allowing MAVIS to reach the required performances in terms of sky coverage and resolution. We present the optical design and performance of the NGS WFS probes and acquisition camera, the actuators embedded in the subsystem and their control hardware. Finally, we show the mechanical arrangement of the submodule.

关键词： Very Large Telescope MAVIS Multi-conjugate Adaptive optics Natural Guide Star Shack-Hartman Wavefront Sensor

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