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

共 444 条记录，以下是281-290 订阅

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Fiber-optical system for visualization of inner pipe defects by microrobot.

Fiber-optical system for visualization of inner pipe defects...

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conference on current developments in lens design and optical engineering V

作者： Gradetsky, V Krabchuk, L Kniazkov, M Solovtsov, V Tulaikova, T Simakova, M Russian Acad Sci Inst Prob Mech Moscow 119526 Russia

ISBN: (纸本)0819454613

The control systems of the miniature robots are suggested for their motion over internal surfaces inside of the small diameter tubes. The mechanical system information-measuring sensor and control systems are considered. Three versions of the mechanical systems are suggested: electromagnetic, triad wheels and conversion of rotation motion to translation one. The electromagnetic mechanism use push pull tipe method for translation motion realization. Developed schemes in the modules design of control systems were checked experimentally on the robot's prototypes. Some results of the computer simulation illustrate the multilink robot control motion along the internal diameters of the tubes. This work was fulfilled under financial support of the Russian Found of Fundamental researches N 01-01-00913 and in frames of Federal Multi Purpose Scientific and Technical Program of Ministry of Industry, Science and Technologies: "Researches and developments on priority directions of science and technology", "Knowledgeable basic investigations" block, "Basic investigations at the field of physics sciences" part Mechanics.

关键词： minirobot in-tube motion mechanical system control algorithms on-board microprocessor control schemes

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Cemented doublet field compressor/corrector: a new optical component of general utility - art. no. 628802

Cemented doublet field compressor/corrector: a new optical c...

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conference on current developments in lens design and optical engineering VII

作者： Schaack, David F. Designs Syst Albuquerque NM 87112 USA

ISBN: (纸本)0819463671

Field correcting lenses have been used to increase the fields of view of large telescopes since at least Ross's work in 1935. In recent years, due to the advent of electronic image sensors, there has been movement toward combining field correction with focal length reduction in so-called field compressor/corrector or telecompressor lenses. Such lenses are now commonly employed in both professional and amateur astronomy. This paper demonstrates that field compressor/corrector lenses can be of great utility in a wider context -- the design of optical instruments. In the finite conjugate and relay applications prevalent in optical instrument design, standard achromats are often employed because there is currently no better alternative short of custom lenses. I show that there exists a particularly attractive family of cemented doublet compressor/correctors that can be combined with standard achromats to greatly improve the imaging performance obtainable in these applications. I propose that these field compressing/correcting doublets should be made available from stock as standard optical components. I introduce a novel viewpoint for analyzing the imaging capability of a lens that makes it simple to visualize the performance obtainable with a lens when it is employed over a wide range of fields and focal ratios. Using the new viewpoint, I demonstrate the performance improvement obtainable when employing the new compressor/correctors. I also show that the new lenses are flexible, that is, that one may obtain their advantages while employing them with a range of achromats or over a range of focal lengths, and that the alignment tolerances between the achromat and the field compressor/corrector are modest.

关键词： field corrector field compressor focal reducer stock lens catalog lens cemented doublet image quality

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Simulation of the optical transmission in 3-D imaging systems based on the principle of time-of-flight

Simulation of the optical transmission in 3-D imaging system...

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conference on current developments in lens design and optical Systems engineering

作者： Tai, W Schwarte, R Heinol, H Univ Siegen Inst Nachrichtenverarbeitung D-57068 Siegen Germany

ISBN: (纸本)0819437387

A time-of-flight (TOF) system based on a novel Photonic Mixer Device (PMD), which detects and demodulates light simultaneously, has demonstrated that it is feasible to realize a 3-D imaging system with compactness, low cost and sufficient resolution for many applications. Active illumination is used in the TOF imaging system. Because of the limited available light source with large bandwidth and in consideration of eye safety, LEDs or low power laser diodes are used as preferable Light sources. The received light may be strongly damped in an order of 40-50dB, depending on the surface characteristics of the objects. Therefore the optical transmission in the light transmission chain of light source - sender lens - object - receiver lens - (PMD) detector array need to be simulated and optimized in order to achieve better performance and maximal power transmission, by the design of such a 3-D camera. Based on the modeling of the light source (laser diodes and LEDs), lens system and statistical characteristics of objects one is able to simulate the light transmission and the light distribution on the object and the PMD detector array. By the use of time-of-flight of the sensing light it is necessary to beep the phase uniformity of the illumination light, because every detector can possibly receive light from different light ways. This would result in a reduction of detection resolution. The optical-path-differences (OPD) representing the time differences from different paths have been simulated from the source to the related pixel for the designed transmitter lens and the receiver lens. Only one source is usually used by direct current modulation of laser diode or LED for uniform modulation phase. The simulation of the light distribution has given estimation of the light gathering efficiency of every pixel and of possible crosstalk between adjacent pixels.

关键词： 3-D imaging time-of-flight optical transmission Photonic Mixer Divice (PMD)

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Liquid crystal lens focusing in monocentric multiscale imagers

Liquid crystal lens focusing in monocentric multiscale image...

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conference on current developments in lens design and optical engineering XIII

作者： Stamenov, Igor Tremblay, Eric Baker, Katherine A. McLaughlin, Paul Ford, Joseph E. Univ Calif San Diego Dept Elect & Comp Engn La Jolla CA 92093 USA

ISBN: (纸本)9780819492036

In multiscale imagers a single objective lens is shared by multiple secondary optical systems, so that a high-resolution wide-angle image is acquired in overlapping fields sensed by multiple conventional focal planes. In the "AWARE2" 2 Gigapixel imager, F/2.4 optics cover a 120 degree field of view using a monocentric glass primary lens shared by 221 molded plastic subimagers, each with a 14 Megapixel focal plane. Such imagers can independently focus parts of the image field, allowing wide-angle imaging over relatively close and deep image fields. However, providing hundreds of independent mechanical focus adjustments has a significant system impact in terms of complexity, bulk, and cost. In this paper we explore the use of an electronically controlled liquid crystal lens for focus of multiscale imagers in general, and demonstrate use with the AWARE2 imager optics. The lens Vector Auto Focus (LVAF) liquid crystal lens provides up to 5 diopters of optical power over a 2.2mm aperture diameter, the maximum currently available aperture. However, a custom lens using the same materials and basic structure can provide the 5 diopters power and 6.4 mm aperture required to obtain full resolution overlapping image fields in the AWARE2 imager. We characterize the LVAF lens and the optical performance of the LVAF lens in the current AWARE2 prototype, comparing the measured and optically modeled resolution, and demonstrating software control of focus from infinity to an 2m object distance.

关键词： Monocentric imager liquid crystal lens Gigapixel focusing mechanism LC focus Multiscale monocentric wide field panoramic

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A three-channel miniaturized optical system for multi-resolution imaging

A three-channel miniaturized optical system for multi-resolu...

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conference on current developments in lens design and optical engineering XIV

作者： Belay, Gebirie Y. Ottevaere, Heidi Meuret, Youri Thienpont, Hugo Vrije Univ Brussel Fac Engn Dept Appl Phys & Photon TONA Brussels Photon TeamB PHOT B-1050 Brussels Belgium

ISBN: (纸本)9780819496911

Inspired by the natural compound eyes of insects, multichannel imaging systems embrace many channels that scramble their entire Field-Of-View (FOV). Our aim in this work was to attain multi-resolution capability into a multi-channel imaging system by manipulating the available channels to possess different imaging properties (focal length, angular resolution). We have designed a three-channel imaging system where the first and third channels have highest and lowest angular resolution of 0.0096 degrees and 0.078 degrees and narrowest and widest FOVs of 7 degrees and 80 degrees, respectively. The design of the channels has been done for a single wavelength of 587.6 nm using CODE V. The three channels each consist of 4 aspherical lens surfaces and an absorbing baffle that avoids crosstalk among the neighbouring channels. The aspherical lens surfaces have been fabricated in PMMA by ultra-precision diamond tooling and the baffles by metal additive manufacturing. The profiles of the fabricated lens surfaces have been measured with an accurate multi-sensor coordinate measuring machine and compared with the corresponding profiles of the designed lens surfaces. The fabricated lens profiles are then incorporated into CODE V to realistically model the three channels and also compare their performances with those of the nominal design. We can conclude that the performances of the two latter models are in a good agreement.

关键词： Multi-resolution imaging systems angular resolution multi-channel three-channel

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Metalens wide-angle receiver for free space optical communications 22

Metalens wide-angle receiver for free space optical communic...

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conference on current developments in lens design and optical engineering XXII

作者： Islam, Md Shafiqul Zaman, Imam Uz Sadri-Moshkenani, Parinaz Khan, Mohammad Wahiduzzaman Boyraz, Ozdal Univ Calif Irvine Irvine CA 92717 USA

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Receiver field of regard is one of the major problems for free space optical (FSO) communications. Drift or vibrations in transceiver orientations reduces effective communication time. The methods implemented to overcome this limitation, often require bulky optical and complex mechanical assemblies with feedback control, that are not suitable for long run operation in an airborne system. In this paper, we propose a novel receiver system that can effectively reduce the impact of pointing errors. The system is composed of two metalenses and one off-the-shelf conventional lens. The first metalens focuses optical beam incident at different angles on the aperture, at different locations on focal plane. The second metalens is placed on the focal plane of first metalens. After passing through the second metalens, the beams become parallel to optical axis of the receiver optical system. The parallel beams are collected by a suitable off-the-shelf aspheric lens and focused back on single detector that sits on a point on the optical axis. The system is designed and analyzed by physical optics theory. With 0.5 mm receiver aperture and 50 mm diameter aspheric lens, Zemax simulation shows that the system can collect +/-5-degree incident angle with detector diameter of 273 mu m. COMSOL frequency domain simulation with smaller diameter beam shows that the efficiency of the 2 metalens system is about 80%. Efficient metalens design and beam compression at detector plane are two key features of the proposed system. The system relaxes the strict requirement of aligning the transmitter and receiver unit in FSO communication.

关键词： Metalens free space optical communication wide angle receiver

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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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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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Looking for order in the optical design landscape

Looking for order in the optical design landscape

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conference on current developments in lens design and optical engineering VII

作者： Bociort, Florian van Turnhout, Maarten Delft Univ Technol Opt Res Grp Lorentzweg 1 NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819463671

In present-day optical system design, it is tacitly assumed that local minima are points in the merit function landscape without relationships between them. We will show however that there is a certain degree of order in the design landscape and that this order is best observed when we change the dimensionality of the optimization problem and when we consider not only local minima, but saddle points as well. We have developed earlier a computational method for detecting saddle points numerically, and a method, then applicable only in a special case, for constructing saddle points by adding lenses to systems that are local minima. The saddle point construction method will be generalized here and we Will show how, by performing a succession of one-dimensional calculations, many local minima of a given global search can be systematically obtained from the set of local minima corresponding to systems with fewer lenses. As a simple example, the results of the Cooke triplet global search will be analyzed. In this case, the vast majority of the saddle points found by our saddle point detection software can in fact be obtained in a much simpler way by saddle point construction, starting from doublet local minima.

关键词： saddle point optimization optical system design lithography

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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...

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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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