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检索条件"任意字段=8th Conference on Current Developments in Optical Design and Optical Engineering"

共 293 条记录，以下是121-130 订阅

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Exposure of Restore-L Camera optical Elements to a Simulated Orbital Radiation Environment 20

Exposure of Restore-L Camera Optical Elements to a Simulated...

引用

conference on current developments in Lens design and optical engineering XX

作者： Miller, Kevin H. Heaney, James B. Lauenstein, Jean-Marie Brown, Stephen K. O'Connor, Kenneth M. Miller, Sharon K. NASA Goddard Space Flight Ctr 8800 Greenbelt Rd Greenbelt MD 20771 USA SGT KBR 7701 Greenbelt Rd Ste 400 Greenbelt MD 20770 USA NASA Glenn Res Ctr 21000 Brookpark Rd Cleveland OH 44135 USA

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

this paper reports on the exposure of visible wavelength camera optical elements to a simulated orbital radiation environment in support of the Restore-L flight project at NASA's Goddard Space Flight Center. Borosilicate glasses with various metal oxide dopants - S-LAL8, S-LAL18, N-SF1, and the polycarbonate material Makrolon GP were exposed to electrons and protons of varying energies. Low energy (E <= 10keV) charged particles were used primarily to assess degradation to the antireflective coatings of the optical elements. High energy (E similar to 1 MeV) charged particles were used to evaluate degradation to the bulk material. Elements of S-LAL18, N-SF1, LaK9G15, and Makrolon GP were exposed to a representative atomic oxygen rich environment. Elements of S-LAL8 and Makrolon GP were exposed to intense ultraviolet radiation. Pre- and post-exposure transmittance measurements were used to quantify the effects on the elements tested in the simulated environment over the 0.3 to 1.2 micron wavelength range. Our measurement results will be discussed in the context of their robustness to the orbital environment and the known chemical constituents of the materials tested.

关键词： Restore-L radiation anti-reflective coating transmittance atomic oxygen ultraviolet

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SHAPE ERROR ANALYSIS IN ULTRA-PRECISION GRINDING OF optical GLASS BY USING MOTOR-current-BASED GRINDING FORCE MONITORING 17

SHAPE ERROR ANALYSIS IN ULTRA-PRECISION GRINDING OF OPTICAL ...

引用

ASME 17th International Manufacturing Science and engineering conference (MSEC) held jointly with the 50th North American Research conference (NAMRC)

作者： Iinuma, Naoki Chen, Boshi Kawasato, Tappei Kakinuma, Yasuhiro Keio Univ Dept Syst Design Engn Yokohama Kanagawa Japan Keio Univ Sch Integrated Design Engn Yokohama Kanagawa Japan

ISBN: (纸本)9780791885819

4K and 8K technologies are attracting attention in optical industries. the most important mechanical element to enhance the imaging performance is the aspherical lens requiring higher surface quality and higher form accuracy. currently, the production process of optical lenses consists of brittle-mode grinding and pro-longed polishing process, which play a role of shaping the form and producing the fine surface, respectively. However, this process is not considered to be suitable for manufacturing such higher-quality lenses for 4K and 8K imaging devices because a required form accuracy could not be ensured, and the polishing time gets longer. To enhance the form accuracy and production efficiency, application of ductile-mode grinding is expected to reduce polishing amount. However, the shape error generated by the ductile mode grinding is not clear. therefore, the purpose of this research is to analyze the relation between the shape error and the grinding force estimated from motor-current in the grinding machine. the motor-current acquisition system in all translational axes and the work spindle is constructed and implemented into a 4-axis ultra-precision aspherical machine. the grinding force in each axis is derived by subtracting the motor current during non-grinding previously obtained in air- grinding test from the current during grinding. Firstly, the behavior of the motor current in each axis is investigated from the viewpoint of repeatability and position dependency. While the periodic fluctuation of the motor current affected by the influence of permanent magnet in the linear motor is confirmed, it shows high repeatability at each position. this result indicated that grinding force is easily calculated from the motor current with less uncertainty. then, influence of grinding condition in the range of ductile mode grinding on the shape error is analyzed by monitoring the motor current. Toward the outside of the workpiece, the shape error gradually increases

关键词： Ultra-precision Grinding Shape Error

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Bound-Abrasive Grinding and Polishing of Surfaces of optical Materials

Bound-Abrasive Grinding and Polishing of Surfaces of Optical...

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conference on current developments in Lens design and optical engineering XI - and Advances in thin Film Coatings VI

作者： Filatov, Yuriy D. Filatov, Olexandr Yu Monteil, Guy Heisel, Uwe Storchak, Michael Natl Acad Sci Ukraine Bakul Inst Superhard Mat 2 Avtozavodskaya UA-04074 Kiev Ukraine Natick Res Dev & Engn Ctr F-25000 Besancon France Univ Stuttgart D-70174 Stuttgart Germany

ISBN: (纸本)9780819482822

Problems of improving efficiency and quality of diamond-abrasive finishing of optical materials by tools with bounded polishing powders, including diamond powder, by means of the improvement of the machining technology and application of new tools with functionally oriented designs and characteristics of working layer are considered. A model has been proposed of the slime particle formation and directional removal as well as of the generation of a high-quality surface in diamond-abrasive finishing of optical materials taking into account the peculiarities of the mass transfer in the contact zone and statistic character of the distribution of slime particles by size. the dependences of the particle number on the diffusion angle and coordinate of the contact have been derived in the studies of the dynamics of collision and diffusion of slime particles. the coordinate dependence of the flat surface roughness of glass K8 optics in fine diamond grinding has been described. Interaction and dispersion of deterioration particles in a contact zone of the tool and a processed sample in the course of polishing is described and the dispersion structure of deterioration particles of the tool on slime particles and on deterioration particles is explained oscillatory. It is shown, that differential dispersion section of deterioration particles on slime particles no less than on deterioration particles as much as possible at corners of dispersion close to 0 and 180o on the central sites of a contact zone. Coordinate dependence of full dispersion section of deterioration particles of the tool and dependence of microprofile height of the processed surface on circular zones radius are calculated. Conformity of experimental and theoretical microroughness profiles of a polished surface on a quartz sample is shown.

关键词： Grinding Polishing optical materials Slime particles Collision Diffusion Roughness

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Stereoscopic vision and the design of stereoscopic displays

Stereoscopic vision and the design of stereoscopic displays

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International optical design conference 2006

作者： Cobb, Joshua M. Corning Tropel Corporation 60 O'Connor Road Fairport NY 14450

ISBN: (纸本)0819464279

Since the discovery of stereopsis in the 19th century the display of stereoscopic information has taken on a variety of forms. From the original Wheatstone stereoscope to the current technology of head-mounted displays and parallax barrier displays, the advantages of binocular vision have been exploited to produce a different kind of display experience. designing optical systems that take advantage of stereopsis creates a different set of constraints and image artifacts. this paper reviews some of the methods of creating a stereo image and highlights some of the unique system design considerations. © 2006 SPIE-OSA.

关键词： Computer vision

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Coherences between influence function size, polishing quality and process time in the magnetorheological finishing

Coherences between influence function size, polishing qualit...

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conference on current developments in Lens design and optical engineering VII

作者： Schinhaerl, Markus Geiss, Andreas Rascher, Rolf Sperber, Peter Stamp, Richard Smith, Lyndon Smith, Gordon Pitschke, Elmar Univ Appl Sci Deggendorf Edlmairstr 6-8 D-94469 Deggendorf Germany Univ West England Bristol Avon England

ISBN: (纸本)0819463671

Magnetorheological finishing (MRF) is a computer controlled polishing process (CCP), which is commonly used in the field of high quality optical lens production. the process uses the material removal characteristic of the polishing tool (influence function) and the surface error-profile to calculate individual, surface error-profile dependent polishing sequences. At the University of Applied Sciences Deggendorf a testing series with a magnetorheological finishing machine has been performed, and effects of the influence function size and its removal capacity on the polishing quality and the process time have been investigated. the result of the research shows that the influence function size has a major effect on the process time, whereas the polishing quality is nearly independent of the influence function size. During the testing series the process time was significantly reduced using an appropriate influence function size. the process time decreased about 9% relating to the original influence function.

关键词： magnetorheological finishing MRF computer controlled polishing CCP polishing tool characteristic influence function process time

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design and Simulation of control strategy of Linear Switched Reluctance Motor for Automatic Translation Door 8

Design and Simulation of control strategy of Linear Switched...

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8th International conference on Electromechanical Control Technology and Transportation, ICECTT 2023

作者： Liu, XiaoHan Sun, BaoJiang Department of Electronics Electricity and Control QiLu University of Technology Jinan250000 China

ISBN: (纸本)9781510668331

In this paper, linear switched reluctance motor (LSRM) is applied to automatic sliding door control system, and a three-closed position control strategy based on fuzzy PI control and current chopper control is proposed and designed. the simulation model of automatic sliding door control system is established, and the simulation is carried out to verify the effectiveness of the control strategy designed in this paper. © 2023 SPIE.

关键词： Position control

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Recent developments in Optimizing optical Tools for Air Bubble Detection in Medical Devices Used in Fluid Transport

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13th International conference on Biomedical engineering (ICBME)

作者： Ravichandran, S. Shanthini, R. Naadhirah, R. R. Nur Yikai, W. Deviga, J. Prema, M. Clinton, L. Temasek Polytech Temasek Engn Sch Singapore 529757 Singapore

ISBN: (纸本)9783540928409

Modelling techniques for optimizing bubble detection tools in the infrared band used in conjunction with a drug transport mechanism for the transport of intravenous fluids in clinical practice have been evaluated qualitatively using simulation techniques. Sensors which are used in signal processing often have limitation when they are made to work in noisy environment. Noise in the working environment can be from various sources such as from power line, high frequency RF fields and background luminance. In case of certain optical sensors, coupling schemes and the interference from devices which are in close proximity to the sensors can also contribute to significant noise. Qualitative studies on the effect of background luminance noise have provided a good understanding on the degree of susceptibility of the optoelectronic receiver for various luminance noises resulting in interferences in the output of a tool developed for the detection of air bubbles in fluid pathways called the "optical Bubble Detection Tool". Experience gained from the earlier studies has provided the required knowledge for developing a design which is less susceptible to external disturbances. the dynamic excitation method for the "optical Bubble Detection Tool" was introduced by modifying the electronic interface of the earlier "optical Bubble Detection Tool". this was easily achieved by understanding the requirements of the pulsed current for energizing the transmitter of the "optical Bubble Detection Tool". As the frequency of excitation and the intensity of the emitted infrared are factors which decide the resolution and sensitivity of the "optical Bubble Detection Tool", it was optimized for several operating environments which are under the influence of other external radiations in the visible range and non-visible range.

关键词： Bubble detection tool Background luminance noise optical sensors

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Comparison between the Arclight Ophthalmoscope and a Standard handheld Direct Ophthalmoscope: a Clinical study 19

Comparison between the Arclight Ophthalmoscope and a Standar...

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19th conference on current developments in Lens design and optical engineering

作者： Parthasarathy, Mohana Kuppuswamy Faruq, Ibrahim Arthurs, Eugene Lakshminarayanan, Vasudevan Univ Waterloo Sch Optometry & Vis Sci Waterloo ON Canada Costco Opt Waterloo ON Canada SPIE Bellingham WA USA Univ Waterloo Dept Phys Waterloo ON Canada Univ Waterloo Dept ECE Waterloo ON Canada Univ Waterloo Dept Syst Design Engn Waterloo ON Canada

ISBN: (数字)9781510620629

ISBN: (纸本)9781510620629

the direct ophthalmoscope, a handheld device gives a highly magnified image of the retina. However, the sustainability of power source and cost are a limitation considering the usage demand. We compared a low-cost solar-powered Arclight ophthalmoscope with a standard ophthalmoscope Heine K180 in terms of ease of examination, usage, field of view, color rendition and patient comfort. Two clinically trained optometrists examined 28 patients and graded the ease of retinal examination, ease of use and assessed cup-disc ratio, which is an important diagnostic parameter for glaucoma, patient comfort and length of examination (scale 1-4). the examiners had good agreement for all assessments. Of a total of 78 examinations, only 8(10.3%) did not result in cup-disc ratio measurement in the undilated pupil condition using both devices. Ease of use was scored higher for Arclight than Heine but this was not statistically significant. In conditions like large discs, the Arclight resulted in easier examinations due to its larger field of view. Color rendition was better with the Heine device. In undilated pupils, the patients often reported that there was significant glare with Heine, however, post-dilation, they reported more glare with Arclight compared to Heine (73% versus 55%). the performance of Arclight was comparable to that of Heine and can be considered a low-cost alternative to the standard direct ophthalmoscope especially in large-scale patient examinations in developing countries where cost might be a factor.

关键词： Direct Ophthalmoscope Retina ophthalmology cup to disc ratio Arclight ophthalmoscope Heine ophthalmoscope solar powered ophthalmoscope

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Double-barrier superlattice infrared photodetectors

Double-barrier superlattice infrared photodetectors

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2008 8th IEEE conference on Nanotechnology, IEEE-NANO

作者： Lin, Shih-Hung Wang, Ying-Hsiang Lu, Jen-Hsiang Kuan, Chieh-Hsiung Feng, Juei-Yang Lay, Tsong-Sheng Department of Electrical Engineering Graduate Institute of Electronics Engineering National Taiwan University Taipei 10617 Taiwan Graduate Institute of Electro-Optical Engineering National Sun Yat-Sen University Kaohsiung Taiwan

ISBN: (纸本)9781424421046

We have designed a double-barrier superlattice infrared photodetector (SLIP) which has a superlattice (SL) sandwiched between the thin and thick barriers. Photoelectrons can bounce back and forth between the two barriers and inject through the thin barrier to enhance the photocurrent. However, the supply of electrons is limited by the thick barrier and thus we have to fabricate the emitter contact on the SL. In comparison with the single-barrier SLIP, this structure shows at least one-order higher magnitude of photocurrent at low bias and the associated detectivity is also increased for more than one order. the dramatic increment of the photocurrent is consistent with our design in the detailed analysis. Because it has the optimized performance at low bias, this double-barrier SLIP is suitable for low power consumption applications. Our detector can be operated at 100K by blocking barriers incorporated into the structure to reduce the dark current. © 2008 IEEE.

关键词： Infrared detectors

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Effect of Dark Periods on Subsequent Restrike in the Discontinuous Development of Positive Leader 8

Effect of Dark Periods on Subsequent Restrike in the Discont...

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8th Asia conference on Power and Electrical engineering, ACPEE 2023

作者： Liu, Lei Liu, Yang Luo, Bing Zhong, Zheng Fan, Caijin Wang, Tingting He, Junjia Chen, Lixue China Southern Power Grid Electric Power Research Institute Guangzhou China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9798350345520

Research on the physical mechanism of discontinuous development for the positive leader discharge is fundamental for optimizing the external insulation design of transmission lines. the effect of dark periods on the subsequent restrike, as a factor determining the discontinuous development feature, is investigated by means of a current measurement system with a wide dynamic range and direct optical imaging. With the increase of the voltage change rate, the duration of dark periods decreases, and the subsequent restrike is facilitated to occur and end the dark period. In addition, the discharge current and the amount of charge, representing the electrical characteristics, increase in the restrike process with the increase of these electrical parameters in the previous dark period. Two equations are suggested for fitting positive correlations of these parameters in the dark period and restrike processes. © 2023 IEEE.

关键词： Electric power transmission

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