scholarly journals Analytic Solution for Double Optical Metasurface Beam Scanners

Mapping Intimacies â—˝  
2021 â—˝  
Author(s):  
Jingru Wang â—˝  
Yuehe Ge â—˝  
Zhizhang (David) Chen â—˝  
Zhimeng Xu â—˝  
Hai Zhang
Keyword(s):  
Small Volume â—˝  
Analytic Solution â—˝  
Low Cost â—˝  
Beam Steering â—˝  
Steering System â—˝  
New Approach â—˝  
Blind Zone â—˝  
Inverse Solutions â—˝  
Control Light â—˝  
Light Beams

Abstract Optical metasurfaces are researched more and more intensively for the possible realization of lightweight and compact optical devices with novel functionalities. In this paper, a new beam-steering system based on double metasurface lenses (metalenses) is proposed and developed. The proposed system is lightweight, small volume, low cost, and easy to integrate. The exact forward and inverse solutions are derived respectively using the generalized Snell’s law of refraction. Given the orientations of the double metalenses, the pointing position can be accurately determined. If the desired pointing position is given, the required metalenses’ orientations can be obtained by applied global optimization algorithms to solve nonlinear equations related to the inverse problem. The relationships of the scan region and blind zone with the system parameters are derived. The method to eliminate the blind zone is given. Comparison with double Risley-prism systems is also conducted. This work provides a new approach to control light beams.

A novel low-cost millimeter-wave beam-steering system

2005 â—˝  
Author(s):  
C. Barth â—˝  
K. Van Caekenberghe â—˝  
K. Sarabandi
Keyword(s):  
Millimeter Wave â—˝  
Wave Beam â—˝  
Low Cost â—˝  
Beam Steering â—˝  
Steering System

Janus – A New Approach to Air Combat Pilot Training

2019 â—˝  
Vol 2019 (4) â—˝  
pp. 7-22
Author(s):  
Georges Bridel â—˝  
Zdobyslaw Goraj â—˝  
Lukasz Kiszkowiak â—˝  
Jean-Georges Brévot â—˝  
Jean-Pierre Devaux â—˝  
...  
Keyword(s):  
Low Cost â—˝  
Cost Effective â—˝  
High Energy â—˝  
Training System â—˝  
Embedded Sensors â—˝  
Pilot Training â—˝  
New Approach â—˝  
Combat Aircraft â—˝  
Air Combat â—˝  
The Cost

Abstract Advanced jet training still relies on old concepts and solutions that are no longer efficient when considering the current and forthcoming changes in air combat. The cost of those old solutions to develop and maintain combat pilot skills are important, adding even more constraints to the training limitations. The requirement of having a trainer aircraft able to perform also light combat aircraft operational mission is adding unnecessary complexity and cost without any real operational advantages to air combat mission training. Thanks to emerging technologies, the JANUS project will study the feasibility of a brand-new concept of agile manoeuvrable training aircraft and an integrated training system, able to provide a live, virtual and constructive environment. The JANUS concept is based on a lightweight, low-cost, high energy aircraft associated to a ground based Integrated Training System providing simulated and emulated signals, simulated and real opponents, combined with real-time feedback on pilot’s physiological characteristics: traditionally embedded sensors are replaced with emulated signals, simulated opponents are proposed to the pilot, enabling out of sight engagement. JANUS is also providing new cost effective and more realistic solutions for “Red air aircraft” missions, organised in so-called “Aggressor Squadrons”.

scholarly journals A New Approach for Approximate Solution of ADE: Physical-Based Modeling of Carriers in Doping Region

Mathematics â—˝  
10.3390/math9050458 â—˝  
2021 â—˝  
Vol 9 (5) â—˝  
pp. 458
Author(s):  
Leobardo Hernandez-Gonzalez â—˝  
Jazmin Ramirez-Hernandez â—˝  
Oswaldo Ulises Juarez-Sandoval â—˝  
Miguel Angel Olivares-Robles â—˝  
Ramon Blanco Sanchez â—˝  
...  
Keyword(s):  
Differential Equation â—˝  
Approximate Solution â—˝  
Analytic Solution â—˝  
Order Differential Equation â—˝  
Electric Circuit â—˝  
New Approach â—˝  
In Doping â—˝  
Electric Behavior â—˝  
Spatio Temporal â—˝  
Physical Phenomena

The electric behavior in semiconductor devices is the result of the electric carriers’ injection and evacuation in the low doping region, N-. The carrier’s dynamic is determined by the ambipolar diffusion equation (ADE), which involves the main physical phenomena in the low doping region. The ADE does not have a direct analytic solution since it is a spatio-temporal second-order differential equation. The numerical solution is the most used, but is inadequate to be integrated into commercial electric circuit simulators. In this paper, an empiric approximation is proposed as the solution of the ADE. The proposed solution was validated using the final equations that were implemented in a simulator; the results were compared with the experimental results in each phase, obtaining a similarity in the current waveforms. Finally, an advantage of the proposed methodology is that the final expressions obtained can be easily implemented in commercial simulators.

scholarly journals Stories, journeys and smart maps: an approach to universal access

2021 â—˝  
Author(s):  
Xi Wang â—˝  
Danny Crookes â—˝  
Sue-Ann Harding â—˝  
David Johnston
Keyword(s):  
Universal Access â—˝  
Low Cost â—˝  
Research Question â—˝  
Emotional Engagement â—˝  
New Approach â—˝  
Reception Study â—˝  
Audio Description â—˝  
Museum Experience â—˝  
Interactive Map â—˝  
Partially Sighted

AbstractThis paper proposes a new approach to universal access based on the premise that humans have the universal capacity to engage emotionally with a story, whatever their ability. Our approach is to present the “story” of museum resources and knowledge as a journey, and then represent this journey physically as a smart map. The key research question is to assess the extent to which our “story” to journey to smart map’ (SJSM) approach provides emotional engagement as part of the museum experience. This approach is applied through the creation of a smart map for blind and partially sighted (BPS) visitors. Made in partnership with Titanic Belfast, a world-leading tourist attraction, the interactive map tells the story of Titanic’s maiden voyage. The smart map uses low-cost technologies such as laser-cut map features and software-controlled multi-function buttons for the audio description (AD). The AD is enhanced with background effects, dramatized personal stories and the ship’s last messages. The results of a reception study show that the approach enabled BPS participants to experience significant emotional engagement with museum resources. The smart model also gave BPS users a level of control over the AD which gave them a greater sense of empowerment and independence, which is particularly important for BPS visitors with varying sight conditions. We conclude that our SJSM approach has considerable potential as an approach to universal access, and to increase emotional engagement with museum collections. We also propose several developments which could further extend the approach and its implementation.

Differential steering-based electric vehicle lateral dynamics control with rollover consideration

2019 â—˝  
Vol 234 (3) â—˝  
pp. 338-348
Author(s):  
Hui Jing â—˝  
Rongrong Wang â—˝  
Cong Li â—˝  
Jinxiang Wang
Keyword(s):  
Electric Vehicles â—˝  
Measurement Problem â—˝  
Low Cost â—˝  
Steering System â—˝  
Front Wheel â—˝  
Steering Control â—˝  
Lateral Velocity â—˝  
Lateral Dynamics â—˝  
Vehicle Rollover â—˝  
Differential Steering

This article investigates the differential steering-based schema to control the lateral and rollover motions of the in-wheel motor-driven electric vehicles. Generated from the different torque of the front two wheels, the differential steering control schema will be activated to function the driver’s request when the regular steering system is in failure, thus avoiding dangerous consequences for in-wheel motor electric vehicles. On the contrary, when the vehicle is approaching rollover, the torque difference between the front two wheels will be decreased rapidly, resulting in failure of differential steering. Then, the vehicle rollover characteristic is also considered in the control system to enhance the efficiency of the differential steering. In addition, to handle the low cost measurement problem of the reference of front wheel steering angle and the lateral velocity, an [Formula: see text] observer-based control schema is presented to regulate the vehicle stability and handling performance, simultaneously. Finally, the simulation is performed based on the CarSim–Simulink platform, and the results validate the effectiveness of the proposed control schema.

Hybrid beam steering system for laser communication between mobile platforms

10.1117/12.708290 â—˝  
2007 â—˝  
Author(s):  
Vladimir V. Nikulin â—˝  
Donald J. Nicholson
Keyword(s):  
Beam Steering â—˝  
Steering System â—˝  
Laser Communication â—˝  
Mobile Platforms â—˝  
Hybrid Beam

Pointing error analysis of Risley-prism-based beam steering system

Applied Optics â—˝  
2014 â—˝  
Vol 53 (25) â—˝  
pp. 5775 â—˝  
Author(s):  
Yuan Zhou â—˝  
Yafei Lu â—˝  
Mo Hei â—˝  
Guangcan Liu â—˝  
Dapeng Fan
Keyword(s):  
Error Analysis â—˝  
Beam Steering â—˝  
Steering System â—˝  
Pointing Error

scholarly journals Integrated optical phased array based large angle beam steering system fabricated on silicon-on-insulator

10.1117/12.875491 â—˝  
2011 â—˝  
Author(s):  
David N. Kwong â—˝  
Yang Zhang â—˝  
Amir Hosseini â—˝  
Ray T. Chen
Keyword(s):  
Phased Array â—˝  
Beam Steering â—˝  
Large Angle â—˝  
Steering System â—˝  
Silicon On Insulator â—˝  
Integrated Optical â—˝  
Optical Phased Array

An application of high-temperature superconductors YBCO to magnetic separation

2017 â—˝  
Vol 31 (25) â—˝  
pp. 1745001 â—˝  
Author(s):  
Qiudong Guo â—˝  
Peng Zhang â—˝  
Lin Bo â—˝  
Guibin Zeng â—˝  
Dengqian Li â—˝  
...  
Keyword(s):  
Magnetic Field â—˝  
High Temperature â—˝  
Magnetic Separation â—˝  
High Magnetic Field â—˝  
Low Cost â—˝  
Rapid Development â—˝  
High Temperature Superconductors â—˝  
New Approach â—˝  
Industrial Areas â—˝  
Ybco Tape

With the rapid development of manufacturing technology of high temperature superconductive YB[Formula: see text]Cu3O[Formula: see text] YBCO materials and decreasing in cost of production, YBCO is marching into industrial areas with its good performances as source of high-magnetic field and rather low cost in reaching superconductivity. Based on analysis of the performance of high temperature superconductors YBCO and development of technology in superconductive magnetic separation both home and abroad, we propose a new approach of taking YBCO tape to make a solenoid as the source of a high magnetic field of magnetic separatior of ores. The paper also looks into the future of the YBCO high temperature superconductive magnetic separation from the perspective of technology and cost, as well as its applications in other industries.

scholarly journals Tunable laser induced periodic surface structures in Ge2Sb2Te5 thin films

2021 â—˝  
Vol 2086 (1) â—˝  
pp. 012170
Author(s):  
Irina G Bessonova â—˝  
Pavel I Trofimov â—˝  
Petr I Lazarenko â—˝  
Demid A Kirilenko â—˝  
Nikolay A Bert â—˝  
...  
Keyword(s):  
Thin Films â—˝  
Phase Change â—˝  
Low Cost â—˝  
Beam Steering â—˝  
Tunable Laser â—˝  
Surface Structures â—˝  
Periodic Surface â—˝  
Light Localization â—˝  
Rapid Fabrication â—˝  
Direct Laser

Abstract Planar photonic structures, such as gratings and metasurfaces, are routinely used for beam steering, waveguide coupling, and light localization. However, conventional fabrication techniques that involve lithography are demanding in terms of time and cost. Much cheaper and simpler methods for surface patterning and formation of periodic surface structures are enabled by direct laser processing. Here, we demonstrate low-cost rapid fabrication of high-quality phase gratings based on the formation of laser induced periodic surface structures (LIPSS, or ripples) in Ge2Sb2Te5 (GST) thin films. Due to unique phase change properties of GST, the structures demonstrate strong modulation of refractive index with period controlled by the wavelength of laser irradiation. We study the formation of phase change LIPSS in a broad range of excitation wavelengths and observe transition between regimes with different orientations of generated ripples with respect to laser polarization.

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