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会议名称:

Conference on novel optical systems design and optimization XX

召开年:

2017

召开地:

San Diego

会议文集:

Novel optical systems design and optimization XX: Conference on novel optical systems design and optimization XX, 8-9 August 2017, San Diego, California, United States

主办单位:

Society of Photo-Optical Instrumentation Engineers

出版时间:

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  • 题名 作者 来源 发表时间 操作
  • Glasses-free 2D/3D switchable display using an integrated single light-guide plate (LGP) with a trapezoidal light-extraction (TLE) film

    作者:Jin-Ho Lee;Yoonsun Choi;Igor Yanusik;Alexander Morozov;Hyoseok Hwang;Dongkyung Nam;Du Sik Park; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    A 10.1-inch 2D/3D switchable display using an integrated single light-guide plate (LGP) with a trapezoidal light-extraction (TLE) film was designed and fabricated. The integrated single LGP was composed of inverted trapezoidal line structures made by attaching a TLE film on its top surface and cylindrical lens structures on its bottom surface. The top surface of the TLE film was also bonded to the bottom surface of an LCD panel to maintain a 3D image quality, which can be seriously deteriorated by the gap variations between the LCD panel and the LGP. The inverted trapezoidal line structures act as slit apertures of parallax barriers for 3D mode. Light beams from LED light sources placed along the left and right edges of the LGP bounce between the top and bottom surfaces of the LGP, and when they collide with the inclined surfaces of the inverted trapezoidal structures, they are emitted toward the LCD panel. Light beams from LED light sources arranged on the top and bottom edges of the LGP are emitted to the lower surface while colliding with the cylindrical lens structures, and are reflected to the front surface by a reflective film for 2D mode. By applying the integrated single LGP with a TLE film, we constructed a 2D/3D switchable display prototype with a 10.1-inch tablet panel of WUXGA resolution (1,200×1,920). Consequently, we showed light-field 3D and 2D display images without interference artifacts between both modes, and also achieved luminance uniformity of over 80%. This display easily generates both 2D and 3D images without increasing the thickness and power consumption of the display device.

    关键字:2D/3D switchable display; light-field display; glasses-free 3D; integrated light-guide plate; trapezoidal light-extraction film

  • Glasses-free 2D/3D switchable display using an integrated single light-guide plate (LGP) with a trapezoidal light-extraction (TLE) film

    Jin-Ho Lee;Yoonsun Choi;Igor Yanusik;Alexander Morozov;Hyoseok Hwang;Dongkyung Nam;Du Sik Park;

    Conference on novel optical systems design and optimization XX

    2017年

  • 540nm, pulsed laser design for particle image velocimetry applications

    作者:A. Sierra-Calderon;J. R. Ek-Ek;A. Sanchez-Nieves;G. Plascencia-Barrera;J.C. Rodriguez-Novelo;J. A. Alvarez-Chavez; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Different types of mechanical and digital devices for measuring the velocity of fluids such as rotameters, annubar tubes, orifice plates, are suitable options. A limitation of such devices is that the direct interaction with the flux causes unwanted perturbations affecting their results. In this work, the design of a 540nm pulsed fiber laser system for measuring the velocity of water as a fluid via the Particle Image Velocimetry (PIV) technique is proposed. In particle image velocimetry, the fluid motion is made visible by adding small tracer particles and from the position of these particles, at two instances of time, it is possible to determine the flow velocity. The proposed, made in-house, noncommercial PIV system consists of: a second harmonic generation Q-switched Yb-doped fiber laser emitting 540nm pulses, a CCD camera, a pair of cylindrical diverging lenses, reference beads, and the fluid under test. The Yb~(3+)-doped fiber laser itself is capable of producing 540nm, 5 - 15ns, 400mJ pulses at 500Hz - 15kHz repetition rates, suitable for PIV flow field studies. Full fiber laser design, in-house PIV system integration and flow field measurement results will be included in the presentation.

    关键字:PIV; Q-Switched; Yb-doped fiber; CCD camera; fluid; Yb optical fiber laser

  • 540nm, pulsed laser design for particle image velocimetry applications

    A. Sierra-Calderon;J. R. Ek-Ek;A. Sanchez-Nieves;G. Plascencia-Barrera;J.C. Rodriguez-Novelo;J. A. Alvarez-Chavez;

    Conference on novel optical systems design and optimization XX

    2017年

  • Imaging application based on an electrically tunable polarization-independent liquid crystal microlens array

    作者:Zhaowei Xin;Qing Tong;Yu Lei;Dong Wei;Xinyu Zhang;Haiwei Wang;Changsheng Xie; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Polarization-independent microlens array based on liquid crystal (PI-LCMLA) has been an interesting and important topic in optoelectronic application. In this study, a polarization-independent microlens array using double layered nematic liquid crystals (LC) with orthogonal alignment is proposed and demonstrated. Two orthogonal LC layers are separated by a double-sided indium-tin oxide silica. Further optical experiments and investigations reveals that the PI-LCMLA can work in polarization and polarization-insensitive mode by operating the driving voltages. The normalized focusing intensity is no polarization dependence on the incident light. Several raw images at different working modes are obtained through by utilizing this novel configuration with low applied voltages. With advantages in high optical efficiency, simple manufacture, electrically tunable focal length, low power consumption, polarization independence and multi operation modes, this device can not only be used for imaging application but also has many potential applications in optical systems.

    关键字:Polarization independent liquid crystal microlens array; Liquid crystal; Imaging application

  • Imaging application based on an electrically tunable polarization-independent liquid crystal microlens array

    Zhaowei Xin;Qing Tong;Yu Lei;Dong Wei;Xinyu Zhang;Haiwei Wang;Changsheng Xie;

    Conference on novel optical systems design and optimization XX

    2017年

  • Common-path holographic objective for conventional photographic camera

    作者:Vira R. Besaga;Nils C. Gerhardt;Peter P. Maksimyak;Martin R. Hofmann; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    In this paper, we introduce a digital holographic camera objective based on conventional customer-oriented components for off-axis external white light illumination. The interferometric module based on a modified common-path point diffraction interferometer provides a direct view of the system and admits self-reference and self-interference operation modes. The proposed system is designed for self-emitting and reflective samples. Its modular assemblage provides easy scalability and up-grade possibilities. The operability of the suggested camera system has been proven for both coherent and low-coherent broadband sources, and reconstructed amplitude and phase information of test samples under white light illumination is presented.

    关键字:holographic camera; common-path; self-reference; self-interference; white light; external illumination; direct view system

  • Common-path holographic objective for conventional photographic camera

    Vira R. Besaga;Nils C. Gerhardt;Peter P. Maksimyak;Martin R. Hofmann;

    Conference on novel optical systems design and optimization XX

    2017年

  • CMOS image sensor for extracting depth information using offset pixel aperture technique

    作者:Byoung-Soo Choi;Myunghan Bae;Sang-Hwan Kim;Jimin Lee;Chang-Woo Oh;Seunghyuk Chang;JongHo Park;Sang-Jin Lee;Jang-Kyoo Shin; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    The 3-dimensional (3D) imaging is an important area which can be applied to face detection, gesture recognition, and 3D reconstruction. Many techniques have been reported for 3D imaging using various methods such as time of fight (TOF), stereo vision, and structured light. These methods have limitations such as use of light source, multi-camera, or complex camera system. In this paper, we propose the offset pixel aperture (OPA) technique which is implemented on a single chip so that the depth can be obtained without increasing hardware cost and adding extra light sources. 3 types of pixels including red (R), blue (B), and white (W) pixels were used for OPA technique. The aperture is located on the W pixel, which does not have a color filter. Depth performance can be increased with a higher sensitivity because we use white (W) pixels for OPA with red (R) and blue (B) pixels for imaging. The RB pixels produce a defocused image with blur, while W pixels produce a focused image. The focused image is used as a reference image to extract the depth information for 3D imaging. This image can be compared with the defocused image from RB pixels. Therefore, depth information can be extracted by comparing defocused image with focused image using the depth from defocus (DFD) method. Previously, we proposed the pixel aperture (PA) technique based on the depth from defocus (DFD). The OPA technique is expected to enable a higher depth resolution and range compared to the PA technique. The pixels with a right OPA and a left OPA are used to generate stereo image with a single chip. The pixel structure was designed and simulated. Optical performances of various offset pixel aperture structures were evaluated using optical simulation with finite-difference time-domain (FDTD) method.

    关键字:CMOS; image sensor; pixel; active pixel sensor

  • CMOS image sensor for extracting depth information using offset pixel aperture technique

    Byoung-Soo Choi;Myunghan Bae;Sang-Hwan Kim;Jimin Lee;Chang-Woo Oh;Seunghyuk Chang;JongHo Park;Sang-Jin Lee;Jang-Kyoo Shin;

    Conference on novel optical systems design and optimization XX

    2017年

  • Curved sensors for compact high-resolution wide field designs

    作者:Christophe Gaschet;Bertrand Chambion;Stephane Getin;Gaid Moulin;Aurelie Vandeneynde;Stephane Caplet;David Henry;Emmanuel Hugot;Wilfried Jahn;Thibault Behaghel;Simona Lombardo;Melanie Roulet;Eduard Muslimov;Marc Ferrari; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Over the recent years, a huge interest has grown for curved electronics, particularly for opto-electronics systems. Indeed, curved sensors help the correction of off-axis aberrations, such as Petzval Field Curvature and astigmatism. In this paper, we describe benefits of curvature and tunable curvature on an existing fish-eye lens. We proposed a new design architecture, compact and with a high resolution, developed specifically for a curved image sensor. We discuss about aberrations and effect of higher sensor curvature on third order aberrations. Besides, we show results of sensors' mechanical limits and its electro-optical characterization. Finally, all these experiments and optical results demonstrate the feasibility and high performances of systems with curved sensors.

    关键字:Curved sensor; optical design; Petzval Field Curvature; high resolution; compact; mechanical limits; aberrations; field of view; electro-optical characterization

  • Curved sensors for compact high-resolution wide field designs

    Christophe Gaschet;Bertrand Chambion;Stephane Getin;Gaid Moulin;Aurelie Vandeneynde;Stephane Caplet;David Henry;Emmanuel Hugot;Wilfried Jahn;Thibault Behaghel;Simona Lombardo;Melanie Roulet;Eduard Muslimov;Marc Ferrari;

    Conference on novel optical systems design and optimization XX

    2017年

  • High-speed video analysis of ballistic trials to investigate the crack propagation in glass laminates

    作者:Arash Ramezani;Hendrik Rothe; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Since computers and software have spread into all fields of industry, extensive efforts are currently made in order to improve the safety by applying certain numerical solutions. For many engineering problems involving shock and impact, there is no single ideal numerical method that can reproduce the various regimes of a problem. This paper presents a set of numerical simulations of ballistic tests, which analyze the effects of soda lime glass laminates, familiarly known as transparent armor. Transparent armor is one of the most critical components in the protection of light armored vehicles. The goal is to find an appropriate solver technique for simulating brittle materials and thereby improve bullet-proof glass to meet current challenges. To have the correct material model available is not enough. In this work, the main solver technologies are compared to create a perfect simulation model for soda lime glass laminates. The calculation should match ballistic trials and be used as the basis for further studies. In view of the complexity of penetration processes, it is not surprising that the bulk of work in this area is experimental in nature. Terminal ballistic test techniques, aside from routine proof tests, vary mainly in the degree of instrumentation provided and hence the amount of data retrieved. Here, the ballistic trials and the methods of analysis are discussed in detail. The numerical simulations are performed with the nonlinear dynamic analysis computer code ANSYS AUTODYN.

    关键字:Video analysis; high-speed video; simulation models; brittle materials; armor systems

  • High-speed video analysis of ballistic trials to investigate the crack propagation in glass laminates

    Arash Ramezani;Hendrik Rothe;

    Conference on novel optical systems design and optimization XX

    2017年

  • Aberrations of temporally modulated optical wavefronts in dispersive optical systems

    作者:David H. Parker; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Classical time-invariant lens aberrations, and methods for correcting them, are well known in the art. However, the design, analysis, and construction of optical components and systems for temporally modulated optical wavefronts-and in particular, wavefronts in optical time-of-flight or phase measurement instruments, such as laser trackers, heterodyne laser interferometers, and spherical retroreflectors, require additional considerations to correct for what will be called Optical Amplitude Modulation (OAM) aberrations. Ray tracing analysis is time-invariant and thus insensitive to temporal modulation of the rays. Secondary considerations must be given to the wavefront of the modulated envelope which is focused on a detector, i.e., while the rays converge to a focus, the phase of the modulated envelope will in general depend on the path of the rays. Elements from communications theory, including amplitude modulation (AM) and analysis in the Fourier transform frequency domain are unified with classical optics, where the optical wavelength of a laser is treated as a carrier signal and the AM produces two slightly offset sidebands. The sidebands produce the OAM aberration due to dispersion and different paths through the optical elements. Suggestions are made for methods for correcting OAM aberrations, such as lens designs that are achromatic at the two sidebands, the use of specific materials matched to the carrier wavelength, the use of corrector plates, and computer modeling tools. A review of relevant patent literature is included.

    关键字:optics design software; ray tracing; dispersion; aberration; optical amplitude modulation; electronic distance measurement; laser tracker; total station

  • Aberrations of temporally modulated optical wavefronts in dispersive optical systems

    David H. Parker;

    Conference on novel optical systems design and optimization XX

    2017年

  • Thermally tunable III-V photonic crystals for coherent nonlinear optical circuits

    作者:Ranojoy Bose;Marina Radulaski;Tho Tran;Thomas Van Vaerenbergh;Dave Kielpinski;Raymond G Beausoleil; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    We present a hybrid photonic architecture using gallium arsenide photonic crystals coupled to silicon nitride waveguides. Chrome microheaters are integrated in the system for tuning the cavities. The combination of low-energy switching elements, combined with low loss photonic waveguides provides an ideal architecture for applications in dedicated optical computing and machine learning applications.

    关键字:optical computing; photonics crystals; hybrid optical systems

  • Thermally tunable III-V photonic crystals for coherent nonlinear optical circuits

    Ranojoy Bose;Marina Radulaski;Tho Tran;Thomas Van Vaerenbergh;Dave Kielpinski;Raymond G Beausoleil;

    Conference on novel optical systems design and optimization XX

    2017年

  • Short range, >100 kbits/s, visible light communication protocol design for high-gamma smartphones

    作者:J. R. Ek-Ek;P. J. Escamilla-Ambrosio;A. Sierra-Calderon;J. C. Rodriguez-Novelo;A. Rodriguez-Mota;J. A. Alvarez-Chavez; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    High gamma smartphones based on Android operating system support the development of third-party applications. This kind of devices include subsystems such as sensors and actuators which can be used for diverse purposes. One example is the implementation of short range visible light communication (VLC) channels where the built-in light-emitting diode (LED) is the transmitter, and the complementary metal-oxide semiconductor (CMOS) camera works as the receiver. A major challenge for this communication channel is the modulation bandwidth of the light source which is limited to a few MHz, and the availability of a line-of-sight. The camera shutter is limited to a few frames per second (30 or 60 fps) for a few bits per second transmission, but the Rolling Shutter effect could allow the enhancement of the bit rate. In this work, we propose a VLC protocol design for the use of the built-in camera and the flash LED in order to implement a short range VLC channel, for high gamma mobile-to-mobile devices based on Android. The design is based on On-Off Keying (OOK) modulation for initially transmitting a few bits. Based on the rolling shutter effect in the CMOS image sensor, bright and dark fringes can be observed within each received frame, and the data can then be retrieved. Furthermore, two thresholding schemes for high fluctuation and large extinction ratio (ER) variations in each frame, are explored. Full protocol design and short range (5 cm), >100 kbits/s, VLC demonstration and image processing results will be included in the presentation.

    关键字:High-gamma mobile devices; imagen processing; short range visible light communication; protocol design; Android OS

  • Short range, >100 kbits/s, visible light communication protocol design for high-gamma smartphones

    J. R. Ek-Ek;P. J. Escamilla-Ambrosio;A. Sierra-Calderon;J. C. Rodriguez-Novelo;A. Rodriguez-Mota;J. A. Alvarez-Chavez;

    Conference on novel optical systems design and optimization XX

    2017年

  • Design and implementation of a large depth-of-field and large aperture optical system

    作者:Xiaohu Guo;Lingqin Kong;Yijian Wu;Yuejin Zhao;Liquan Dong;Ming Liu; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    In this paper, it presents a new imaging technology that could realize to extent the depth of field and contribute to receive the large iris aperture optical system. The new technology combines lenses assistance and the aberration modulation. Based on the method, we establish a new optical system. Simulation results indicate that the modulation transfer function (MTF) curves of this optical system have consistency feature during different object distances. According to the feature, we can restore ambiguous images to unambiguous ones. Compared with another normal optical system, the experimental results indicate that the new optical system has the large depth of field and large iris aperture features.

    关键字:optical design; large iris; aberration modulation; large depth of field; wave front coding

  • Design and implementation of a large depth-of-field and large aperture optical system

    Xiaohu Guo;Lingqin Kong;Yijian Wu;Yuejin Zhao;Liquan Dong;Ming Liu;

    Conference on novel optical systems design and optimization XX

    2017年

  • Thin head-mounted display utilizing reflective optics design

    作者:Chia-ping Lin;Guo-Dung J. Su; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    For wearable device, the most importance point for image system is miniaturization. In this paper, we present a head-mount display that reduces the distance between the eyeball to the lens and its thickness. In traditional, the thickness of head-mount display is not thin enough because of it is designed that the light source is transmit a series of lenses. It make a large volume of head-mounted display. The system consists of three curve mirrors and a free-form lens. Mirrors and lens can form a reflective design. The image source is placed be next to the eyeball. We expect the image to go through the mirrors to the eyeball so that make the volume of head-mount display can be thinner. The goal of system is 60 mm thick and 140 mm wide. The field of view is designed to be 140 degree. By using the 3D printer, we can make a model of glass to achieve our design.

    关键字:head-mounted displays; reflective optics

  • Thin head-mounted display utilizing reflective optics design

    Chia-ping Lin;Guo-Dung J. Su;

    Conference on novel optical systems design and optimization XX

    2017年

  • Design, manufacture, and evaluation of prototype telescope windows for use in low-vision aids

    作者:Cyril Bourgenot;Johannes Courtial;Euan Cowie;John Girkin;Gordon Love;David Robertson;Laura Young; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Pixellated Optics, a class of optical devices which preserve phase front continuity only over small sub areas of the device, allow for a range of uses that would not otherwise be possible. One potential use is as Low Vision Aids (LVAs), where they are hoped to combine the function and performance of existing devices with the size and comfort of conventional eyewear. For these devices a Generalised Confocal Lenslet Array (GCLA) is designed to magnify object space, creating the effect of traditional refracting telescope within a thin, planar device. By creating a device that is appreciably thinner than existing LVA telescopes it is hoped that the comfort for the wearer will be increased. We have developed a series of prototype GLCA-based devices to examine their real-world performance, focussing on the resolution, magnification and clarity of image attainable through the devices. It is hoped that these will form the basis for a future LVA devices. This development has required novel manufacturing techniques and a phased development approach centred on maximising performance. Presented here will be an overview of the development so far, alongside the performance of the latest devices.

    关键字:Geometric Optics; Imaging Systems; Artificially Engineered Materials

  • Design, manufacture, and evaluation of prototype telescope windows for use in low-vision aids

    Cyril Bourgenot;Johannes Courtial;Euan Cowie;John Girkin;Gordon Love;David Robertson;Laura Young;

    Conference on novel optical systems design and optimization XX

    2017年

  • Ideal-lens stars

    作者:Jakub Belin;Tomas Tyc;Stephen Oxburgh;Johannes Courtial; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    We recently showed how structures of ideal (thin) lenses can act as (ray-optical) transformation-optics devices. This was done by breaking the structure down into all sets of ideal lenses in the structure that share a common edge, and showing that these sets have very specific imaging properties. In order to start the development of a general understanding of the imaging properties of sets of ideal lenses that share a common edge, we investigate here particularly simple and symmetric examples of combinations of ideal lenses that share a common edge. We call these combinations ideal-lens stars. An ideal-lens star is formed by N identical ideal lenses, each placed such that they share a principal point (which lies on the common edge) and such that the angles between all neighbouring lenses are the same. We find that that passage through every single ideal lens in the ideal-lens star images any point to itself. Furthermore, light-ray trajectories in ideal-lens stars are piecewise linear approximations to conic sections. (In the limit of N approaching infinity, they are conic sections.)

    关键字:imaging; optical design; lens systems

  • Ideal-lens stars

    Jakub Belin;Tomas Tyc;Stephen Oxburgh;Johannes Courtial;

    Conference on novel optical systems design and optimization XX

    2017年

  • Imaging with pairs of skew lenses

    作者:Jakub Belin;Stephen Oxburgh;Tomas Tyc;Johannes Courtial; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Many of the properties of thick lenses can be understood by considering these as a combination of parallel ideal thin lenses that share a common optical axis. A similar analysis can also be applied to many other optical systems. Consequently, combinations of ideal lenses that share a common optical axis, or at least optical-axis direction, are very well understood. Such combinations can be described as a single lens with principal planes that do not coincide. However, in recent proposals for lens-based transformation-optics devices the lenses do not share an optical-axis direction. To understand such lens-based transformation-optics devices, combinations of lenses with skew optical axes must be understood. In complete analogy to the description of combinations of pairs of ideal lenses that share an optical axis, we describe here pairs of ideal lenses with skew optical axes as a single ideal lens with sheared object and image spaces. The transverse planes are no longer perpendicular to the optical axis. We construct the optical axis, the direction of the transverse planes on both sides, and all cardinal points. We believe that this construction has the potential to become a powerful tool for understanding and designing novel optical devices.

    关键字:imaging; optical design; lens systems

  • Imaging with pairs of skew lenses

    Jakub Belin;Stephen Oxburgh;Tomas Tyc;Johannes Courtial;

    Conference on novel optical systems design and optimization XX

    2017年

  • A novel surface plasmon coupled tunable wavelength filter for hyperspectral imaging

    作者:John F. Turner;Ajaykumar H. Zalavadia; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    The development of ultra-compact handheld hyperspectral imagers has been impeded by the scarcity of small widefield tunable wavelength filters. The widefield modality is preferred for handheld imaging applications in which image registration can be performed to counter scene shift caused by irregular user motions that would thwart scanning approaches. Conventional widefield tunable filters like the liquid crystal tunable filter and acousto-optic tunable filter achieve narrow passbands across a wide spectral range by utilizing large interaction lengths, thereby increasing the thickness of the device along the optical path. In addition, these technologies rely on rather bulky external control circuitry and, in the case of acousto-optic filters, high power requirements. In the work presented here, we introduce a novel widefield tunable filter for visible and near infrared imaging based on surface plasmon coupling that can be miniaturized without sacrificing performance. The surface plasmon coupled tunable filter (SPCTF) provides diffraction limited spatial resolution with a <10nm nominal passband and a spurious free spectral range of more than 300nm. Acting on the π-polarized component, the device is limited to transmitting 50 percent of unpolarized incident light. This is higher than the throughput of comparable Lyot-based liquid crystal tunable filters that employ a series of linear polarizers. The design of the SPTF is presented along with a comparison of its performance to calculated estimates of transmittance, spectral resolution, and spectral range.

    关键字:surface plasmon; tunable wavelength filters; hyperspectral imaging; surface plasmon resonance

  • A novel surface plasmon coupled tunable wavelength filter for hyperspectral imaging

    John F. Turner;Ajaykumar H. Zalavadia;

    Conference on novel optical systems design and optimization XX

    2017年

  • Experimental realisability of lens cloaks

    作者:Stephen Oxburgh;Jakub Belin;Euan N. Cowie;Johannes Courtial; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    We recently showed how to construct omni-directional ray-optical transformation-optics devices out of ideal thin lenses. These devices can be seen as theoretical generalisations of the paraxial, four-lens, "Rochester cloak". Here we investigate the practical realisability of such devices. We use ray-tracing simulations to compare combinations of skew lenses of different types, including ideal lenses and phase holograms of lenses.

    关键字:transformation optics; imaging; optical design; lens systems

  • Experimental realisability of lens cloaks

    Stephen Oxburgh;Jakub Belin;Euan N. Cowie;Johannes Courtial;

    Conference on novel optical systems design and optimization XX

    2017年

  • Dip-and-bake low-cost high-performance lenses for smartphone-based microscopy

    作者:Bhuvaneshwari Karunakaran;Joseph Tharion;Debjani Paul;Soumyo Mukherji; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Aspherical optical lenses are known for high performance and aberration free imaging. They are increasingly in demand for developing simple and compact high quality optical systems. The conventional methods of production of aspherical lenses are complex and time-consuming. There is a need for a simple, inexpensive and robust method of fabrication of such lenses. Here, we present a novel, low cost and simple approach to fabricate aspherical lenses reproducibly. The two-step process involves 1) controlled wetting of a curved surface with a transparent, cross-linkable polymer by dipping, and 2) pulling the wetted curved surface from the polymer solution. The curvature of the lens is dependent on the area of wetting, speed of pulling and the curvature of the curved surface. The lenses are produced with less than 5% error, and hence, the approach is reproducible in comparison to the previously reported techniques. A smartphone microscope developed using one of the fabricated lenses is found to have a resolution of ~1.7 μm. In addition, we show an application of these lenses as a means to check for the authenticity of Indian currency notes by a common man. The micro-patterns on the currency note are imaged using the smartphone microscope in ambient light. Also, the lenses have potential applications in developing compact and portable high quality optical systems, such as, endoscopes and microscopes.

    关键字:Aspheric lenses; aspheric PDMS lens; high performance lens; smartphone microscopy; mold-free lens fabrication; ambient light illumination; fake currency note; curvature control

  • Dip-and-bake low-cost high-performance lenses for smartphone-based microscopy

    Bhuvaneshwari Karunakaran;Joseph Tharion;Debjani Paul;Soumyo Mukherji;

    Conference on novel optical systems design and optimization XX

    2017年

  • Gait Motion Analysis using Optical and Inertial Sensor Fusion to Design Human Kinetic Energy Harvesting Systems

    作者:Oliver Kroening;Hendrik Rothe; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Biomechanical energy harvesting converting kinetic energy from human motion into electrical energy appeared as a promising technology for powering mobile devices. The optimization of these energy harvesting systems requires knowledge about human gait as an energy source to maximize the power output. Therefore, motions during walking and running have to be evaluated to determine the amount of available and convertible energy in several body parts. In case of vibration energy harvesting systems, their efficiency is also dependent on the adjustment of the systems' frequency and dimensions and frequency characteristics to the driving force. Thus, this paper presents a solution fusing optical sensors and inertial measurement units (IMU) to analyze human locomotion. High-speed cameras are used to track the positions and angles of the synchronized inertial body sensors in an earth frame while the IMUs acquire gyroscope, accelerometer and magnetometer data. This data is used to calculate linear acceleration and actual orientation represented in quaternions applying an algorithm by Madgwick. The orientation gives major information about the effect of the driving force on moving masses of the system as energy harvesting devices are often designed as single-axis generators. Furthermore, frequency responses of acceleration data from different body positions while gait cycles are analyzed. Finally, prospects and issues converting acceleration into velocity and position data and vice versa are discussed.

    关键字:Energy harvesting; inertial measurement unit; biomechanical analysis; optical tracking; sensor fusion; orientation estimation; accelerometry

  • Gait Motion Analysis using Optical and Inertial Sensor Fusion to Design Human Kinetic Energy Harvesting Systems

    Oliver Kroening;Hendrik Rothe;

    Conference on novel optical systems design and optimization XX

    2017年

  • Method for synthesis of high-accuracy dynamic non-linear control systems

    作者:Vladimir L. Kodkin; 会议名称:Conference on novel optical systems design and optimization XX 2017年

    Optical Engineering + Application conference in 2016 had only few reports dedicated to high-accuracy position control systems for optical complexes. However, at SPIE Optics + Photonics Exhibition 2016 dozens of companies offered such projects. In that respect, this report may be of interest for academic community. The main method for assessment of performance of automatic control systems is assessment of stability of a system as it allows the evaluation of dynamics and accuracy as well as the method for additional adjustment and technological capacity of the whole complex comprising the system. As a rule, complex systems do not reduce to linear systems or other known variants, so their analysis is normally based on modeling or simplified calculation. In the suggested paper the known criterion of stability for non-linear systems by Popov involves not frequency locus of linear part, but logarithmic frequency characteristics of the system, including non-linear frequency characteristics. It allows the development of conditions of stability and methods of adjustment for such complex systems as servo drives with non-rigid mechanics and alternating-current systems which cannot be analyzed with the help of known methods, In the systems where the stated methods are used accuracy and speed performance are increased fivefold at an average. All theoretical calculations are confirmed by experiments and modeling.

    关键字:non-linear control systems; non-linear frequency characteristic; conditions of stability; criterion of stability for non-linear systems; alternating-current systems

  • Method for synthesis of high-accuracy dynamic non-linear control systems

    Vladimir L. Kodkin;

    Conference on novel optical systems design and optimization XX

    2017年

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