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检索条件"任意字段=Conference on Computational Optics Held as Part of Part of SPIE Optical Systems Design Conference"

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Development of FBG Miniature Force Sensors for Tactile Sensing in Robot-Assisted Minimally Invasive Surgery 4

Development of FBG Miniature Force Sensors for Tactile Sensi...

引用

4th International computational Imaging conference, CITA 2024

作者： Dong, Shiyuan Xiong, Xuanwei Lou, Yuyang Luo, Dong Wu, Jianwei Yang, Tianyu Liu, Huanhuan Dong, Yuming School of Physics and Electronic Engineering Chongqing Normal University Chongqing401331 China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China The Key Laboratory of Optoelectronic Technology and Systems Chongqing University Chongqing400044 China

ISBN: (纸本)9781510688834

The present study introduces a miniature axial force sensor based on Fiber Bragg Grating (FBG) technology, specifically developed for detecting abnormalities within tissues during robot-assisted minimally invasive surgeries. This FBG force sensor is composed of a single optical fiber engraved with an FBG element, a sensor cap, an elastomer, and a sensor base. The unique structural design of the elastomer enhances sensitivity to axial forces while effectively mitigating interference from transverse forces. Unlike traditional methods that directly bond the FBG, the fiber in this design is suspended tightly at both ends of the elastomer. This approach addresses the issue of uneven adhesive thickness in the FBG region and prevents chirp-related failures. The sensor boasts a compact design with a diameter of only 1.5 mm and a length of 10 mm, making it easily integrable into surgical robots and overcoming the limitations posed by larger sensors in previous designs. Finally, a force calibration experiment was conducted, determining the sensor's sensitivity to be 276 pm/N within a force range of 0-1 N. © 2025 spie.

关键词： optical fibers

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Analysis and design of pervasive computing intelligent surveillance system integrating optical sensors and behavioral analysis for industrial internet 2

Analysis and design of pervasive computing intelligent surve...

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2nd International conference on Big Data, computational Intelligence, and Applications, BDCIA 2024

作者： Yao, Di Luo, Chenyao Cheng, Weiwei Song, Huaju Beijing100083 China Portland Institute Nanjing University of Posts and Telecommunications Nanjing210003 China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China School of Environmental Science NanJing XiaoZhuang University Nanjing210017 China

ISBN: (纸本)9781510689053

Nowadays, the surveillance system performing as an indispensable part for modern industrial Internet has attracted much attention. With the continuous progress of microprocessor technology, sensor technology, particularly optical sensors, and network technology, it has entered the era of pervasive computing, which leads to the breakthrough of the surveillance system and the emergence of intelligent environment safety monitoring systems. However, the intelligence of surveillance systems is still a significant challenge. In this paper, we propose a surveillance system for detecting and recognizing people based on their behaviors from images or video sequences using computer vision techniques and optical sensor data, which is implemented by designing the system architecture through a hierarchical structure, applying key techniques such as background subtraction, modeling, and optical sensing analysis, and experimentally processing and testing a variety of behavioral samples. The alarm information generated by the proposed surveillance system aided by pervasive computing system can be delivered to remote terminals. Experimental results reveal that the environmental monitoring and alarm information can be processed in real time with devices, such as cell phones, telephones, and PCs. Therefore, the proposed approach can improve the performance of the surveillance systems. © 2025 spie.

关键词： Alarm systems

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Simulation and Compensation of Thermal Lensing in Highpower optical systems

Simulation and Compensation of Thermal Lensing in Highpower ...

引用

conference on computational optics held as part of part of spie optical systems design conference

作者： Rall, Phillip Lino Pflaum, Christoph Univ Erlangen Nurnberg Chair Syst Simulat 110 Cauerstr 11 Erlangen Germany Erlangen Grad Sch Adv Opt Technol SAOT Erlangen Germany

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

High-power laser beams are usually imaged with the help of suitable optics, consisting of several optical elements. The propagation of such high-power beams can result in a significant thermally induced focus shift, the thermal lens effect. This is mainly due to the deposited power of the beam itself, acting as a heat source in the optical elements. The resulting change in temperature leads to both, a deformation of the optical element, and a change of the refractive index. In this work, the finite element method was coupled with ray tracing, in order to get both, optical and thermal-structural simulation results. Additionally, thermal radiation and the mutual influence of optical elements have to be considered. With the method proposed, the thermal lens of optical systems can be determined exactly, but it also enables for designing of new methods to completely compensate for thermal lensing. In this work, a complete compensation of thermal lensing for a F-theta-scanner could be simulated, which even works at optical powers of 10kW.

关键词： Ray tracing finite element thermal lensing optical design

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The design of illumination optics for vehicle communication issues 6

The design of illumination optics for vehicle communication ...

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conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Bogdanov, Nikolay Sokolov, Vadim G. Potemin, Igor S. Ryzhova, Irina Birukov, Elissey ITMO Univ St Petersburg 197101 Russia RAS Keldysh Inst Appl Math Moscow 125047 Russia

ISBN: (纸本)9781510645936;9781510645929

Currently, the vehicle-to-vehicle communication systems is actively developing, where various wireless communication technologies are used. One such technology is wireless optical communication. However, most research has focused on designing and testing electrical circuits using standard optical elements such as spherical lenses. In this paper, we propose an effective method for designing hybrid free-form optical systems, which would provide a given spatial distribution of the signal-carrying light radiation within a given angular field.

关键词： nonimaging optics freeform surfaces light engineering optical design Vehicle-to-vehicle communication

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Propagation of light in gradient index media with symmetrical iso-indicial (constant refractive index) contours

Propagation of light in gradient index media with symmetrica...

引用

conference on computational optics held as part of part of spie optical systems design conference

作者： Flynn, Conor Goncharov, Alexander, V Natl Univ Ireland Sch Phys Appl Opt Grp Univ Rd Galway Ireland

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

Light propagation in non-homogeneous media with varying refractive index is challenging to analyse, even with knowledge of the gradient index (GRIN) structure n(x,y,z). Differential equations can be used to describe the path light rays take when travelling through a medium. Solutions to a differential equation are used to calculate the focal length of a GRIN lens with focus on quadratic GRIN profiles. Ray-tracing in GRIN media is notoriously difficult, and usually not possible without numerical methods, however for several types of GRIN lenses, the analytical solution exists. Examples of spherical GRIN lenses can be found in nature such as the lens in an octopus eye. A formula is proposed here to calculate the focal length of such a lens which will be compared to previous studies and models created on ray-tracing software, ZEMAX.

关键词： GRIN lenses Gradient-index optics Refractive index Ray tracing Geometrical optics ZEMAX Eye model Octopus Trout

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Principles of operation and prospects for the development of laser lithographic systems for the synthesis of optical elements

Principles of operation and prospects for the development of...

引用

conference on computational optics held as part of part of spie optical systems design conference

作者： Khomutov, V. N. Shimansky, R., V Nasyrov, R. K. Korolkov, V. P. Russian Acad Sci IA&E SB RAS Inst Automat & Electrometry Siberian Branch Moscow Russia

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

The development and research of new devices and systems of diffractive and integrated optics, which based on elements with thin-layer micro- and nanostructures, requires the improvement of the technological base. The most massive and lowcost is planar optical elements, on the surface of which diffractive and raster computer-synthesized micro- and nanostructures are formed, as well as structures based on synthesized metamaterials. In recent years, off-axis and axisymmetric computer-synthesized holograms for control and alignment of optical systems, microstructured optical elements with 3D microrelief for complex transformations of wavefronts and intensity distributions of light beams (micro-optics), integrated-optical passive and active circuits have been greatly developed. In this paper describes the principles of operation of two different scanning laser nanolithography system developed operating in a writing and polar coordinate system. Development and research work these lithographic systems were conducted at the Institute of Automation and Electrometry of the SB RAS for many years. The areas of applicability of these systems are described, their differences and technical limitations are considered. The emphasis is made on fundamentally similar units of installations of this class and the prerequisites for their unification are considered. Methods for increasing their resolution, speed and accuracy of writing are proposed, prospects and directions of their development are analyzed. The results of writing test optical elements on metal films using the described methods are demonstrated.

关键词： scanning laser nanolithography diffraction gratings thin metal films thermochemical laser recording

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Automotive headlamp optics for a pixelated μLED source 6

Automotive headlamp optics for a pixelated μLED source

引用

conference on Illumination optics VI held as part of part of spie optical systems design conference

作者： Brick, Peter Guenther, Alexander Groetsch, Stefan OSRAM Opto Semicond GmbH Leibnizstr 4 D-93055 Regensburg Germany

ISBN: (纸本)9781510645936;9781510645929

Advances in LED technology facilitate a variety of new application scenarios in automotive exterior lighting. Attractive features in this field are related to dynamic lighting scenarios. To replace mechanical adjustments of the past, the newest mu LED technology provides a high-resolution source array based on a monolithic block of IC-chip, opto chip, and converter layer. Nevertheless, design and implementation of a corresponding optical system are required to project the mu LED array onto the road.

关键词： automotive headlamp mu LED pixelate LED

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The virtual prototyping of complex optical systems on multiprocessor workstations

The virtual prototyping of complex optical systems on multip...

引用

conference on computational optics held as part of part of spie optical systems design conference

作者： Zhdanov, Andrey Zhdanov, Dmitry Sorokin, Maksim ITMO Univ 49 Kronverksky Pr St Petersburg 197101 Russia

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

Realistic rendering that relies on physically correct laws of propagation and accumulation of light energy, is used for solving a wide range of applied problems, including virtual prototyping of complex optical systems. With the increasing computation efficiency and complexity of computational architecture, both rendering complexity, and the required computational accuracy increase. Taking into account that modern workstations might have several CPUs with up to 128 virtual cores each, the task of the effective parallelization of the rendering algorithms that utilize all CPU resources is an urgent challenge. In the scope of the current research, the authors investigated the application of various CPU parallelization approaches for the realistic rendering algorithms based on the backward photon mapping, and their limitations. These methods include traditional methods such as synchronous and asynchronous parallelization approaches and their combination. As a result of the research, the authors developed the three-level parallelization method, consisting of fully synchronous, partially synchronous, and asynchronous levels. The key feature of the three-level parallelization method is the additional semi-synchronous level with shared memory. Due to the use of semi-synchronous calculations and asynchronous data exchange between threads, there is no need to synchronize the access to a shared data, which results in increased rendering speed. The three-level parallelization model can also be used in distributed systems due to the asynchronous model is used at the top level. The results of the comparative testing of parallelization approaches on the multiprocessor workstation when rendering images formed by virtual prototypes of the real systems are presented.

关键词： virtual prototyping realistic rendering bidirectional ray tracing photon mapping backward photon mapping parallel computing distributed computing

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Opto-thermal simulation model for optimizing the thermal response of the optical properties of Ce:YAG single-crystal phosphors

Opto-thermal simulation model for optimizing the thermal res...

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conference on computational optics held as part of part of spie optical systems design conference

作者： Chatzizyrli, Elisavet Afentaki, Angeliki Hinkelmann, Moritz Lachmayer, Roland Neumann, Joerg Kracht, Dietmar Laser Zentrum Hannover eV Hollerithallee 8 D-30419 Hannover Germany Gottfried Wilhelm Leibniz Univ Hannover Inst Produktentwicklung & Geratebau IPeG Univ 1 D-30823 Garbsen Germany Cluster Excellence PhoenixD Photon Opt & Engn In Hannover Germany

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

As laser diodes (LDs) replace LEDs in the remote phosphor setup, a new class of lighting solutions emerges, giving rise to laser-excited remote phosphor (LERP) systems. While already in use in some commercial applications such as automotive lighting, these systems have not yet matured. The optical behavior of phosphors is temperature dependent, specifically the absorption coefficient, the conversion efficiency reflected in the quantum efficiency (QE) coefficient, and, to a lesser extent, the emission spectrum. For this reason, opto-thermal analysis is critical for further investigating and optimizing these systems. A steady-state opto-thermal simulation scheme that combines ray tracing in opticstudio software with heat transfer calculations using the finite element method (F.E.M.) in ANSYS is presented and experimentally validated here. Furthermore, the temperature-dependent models established for phosphor properties are used to optimize the phosphor sample.

关键词： Multi-physics simulation modeling laser-excited remote phosphor systems experimental validation optimization

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A Regularized Optimization Approach for Optogenetic Stimulation using Ferroelectric SLMs

A Regularized Optimization Approach for Optogenetic Stimulat...

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conference on computational optics held as part of part of spie optical systems design conference

作者： Ampeliotis, Dimitris Politi, Christina (Tanya) Anastasiou, Aggeliki Alexandropoulos, Dimitris Ionian Univ Dept Digital Media & Commun Corfu Greece Univ Patras Dept Mat Sci Rion Patra Greece Univ Peloponnese Dept Elect & Comp Engn Tripoli Greece

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

In this work, the problem of designing proper Phase-Shifting Masks (PSMs) suitable for optogenetic applications is considered. In such applications, structured light is used to stimulate neurons or groups of neurons while short-term excitation is required to study the dynamics of the neuronal activity. In practice, such fast response times can be achieved only via the use of ferroelectric Spatial Light Modulators (fSLMs) that posses significantly smaller response times as compared to the, more common, liquid crystal based SLMs. However, typical fSLMs are restricted to using only a small number of discrete phase levels. To this end, we propose a regularized cost function for Phase-Shifting Mask design, that promotes phases in a discrete phase set. Significantly higher Peak Signal-to-Noise Ratio (PSNR) is achieved by the proposed approach, as compared to other approaches.

关键词： Optogenetics discrete levels phase shifting mask design ferroelectric SLMs

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