A Low-Power Light-Weight Tunable Lens for Ophthalmic Applications

2016 ◽  
Author(s):  
Nazmul Hasan ◽  
Aishwaryadev Banerjee ◽  
Hanseup Kim ◽  
Carlos H. Mastrangelo
Keyword(s):  
Low Power ◽  
Light Weight ◽  
Tunable Lens

Development of a low-power xenon ion thruster for light-weight satellites

1996 ◽  
Author(s):  
O. Gorshkov ◽  
V. Muravlev ◽  
V. Grigor'yan
Keyword(s):  
Low Power ◽  
Light Weight ◽  
Ion Thruster

Design and implementation of atmospheric multi-parameter sensor for UAV-based aerosol distribution detection

Sensor Review ◽  
2017 ◽  
Vol 37 (2) ◽  
pp. 196-210 ◽  
Author(s):  
Fangjie Yu ◽  
Yunfei Liu ◽  
Longqing Fan ◽  
Linhua Li ◽  
Yong Han ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Embedded System ◽  
Low Power ◽  
Aerosol Particle ◽  
Particle Concentration ◽  
Pressure Probe ◽  
Light Weight ◽  
Content Type ◽  
The Difference ◽  
Pm2.5 And Pm10

Purpose In this paper, a light-weight, low-power atmospheric multi-parameter sensor (AMPS), which could be mounted on small flying platforms such as a tethered balloon, a quad-rotor unmanned aerial vehicle (UAV), a UAV helicopter, etc., is implemented and integrated to sample vertical distribution of aerosols with integrated parameters of aerosol particle concentration, temperature, relative humidity and atmospheric pressure. Design/methodology/approach The AMPS integrates three kinds of probes in an embedded system. A synchronous method based on GPS is proposed to drive the laser aerosol particle sensor, the temperature and humidity probe and the pressure probe to sample four channels approximately simultaneously. Different kinds of housing are designed to accommodate various flying platforms, and the weight is controlled to adapt the payload of each platform. Findings A series of validation tests show that while the AMPS achieves high precision, its power consumption is less than 1.3 W, which is essential for light flying platforms. The AMPS was mounted on different flying platforms and the difference was evaluated. For three times every five days, vertical profiles of PM2.5 and PM10 concentrations were observed by the AMPS mounted on a quad-rotor UAV, which revealed the significant correlation between the aerosol particle concentration and atmospheric parameters. Originality/value A new light-weight and low-power AMPS for small flying platforms is designed and tested, which provides an effective way to explore the properties of aerosol vertical distribution, and to monitor pollutants flexibly.

Light-weight Routing Protocol in IoT-based Inter-Device Telecommunication Wireless Environment

2016 ◽  
Vol 6 (5) ◽  
pp. 2352 ◽  
Author(s):  
Hayoung Oh ◽  
Sangsoon Lim
Keyword(s):  
Low Power ◽  
Routing Protocol ◽  
Probability Distributions ◽  
Base Stations ◽  
Neighbor Discovery ◽  
Light Weight ◽  
Lossy Networks ◽  
Ipv6 Address ◽  
Wireless Environment ◽  
Iot Devices

<p><span lang="EN-US">The primary task for IoT-based hyper-connectivity communications lies in the development of direct communications technique among IoT devices in RPL (Routing Protocol for Low-Power and Lossy Networks) environment without the aid from infras such as access points, base stations etc. In a low-power and lossy wireless network, IoT devices and routers cannot keep the original path toward the destination since they have the limited memory, except for a limited number of the default router information.. Different from the previous light-weight routing protocols focusing on the reduction of the control messages, the proposed scheme provides the light-weight IPv6 address auto-configuration, IPv6 neighbor discovery and routing protocol in a IoT capable infra-less wireless networks with the bloom filer and enhanced rank concepts. And for the first time we evaluate our proposed scheme based on the modeling of various probability distributions in the IoT environments with the lossy wireless link. Specifically, the proposed enhanced RPL based light-weight routing protocol improves the robustness with the multi-paths locally established based on the enhanced rank concepts even though lossy wireless links are existed. We showed the improvements of the proposed scheme up to 40% than the RPL based protocol.</span></p>

Flexible low-power source-gated transistors with solution-processed metal–oxide semiconductors

Nanoscale ◽  
2020 ◽  
Vol 12 (42) ◽  
pp. 21610-21616
Author(s):  
Dingwei Li ◽  
Momo Zhao ◽  
Kun Liang ◽  
Huihui Ren ◽  
Quantan Wu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Power Consumption ◽  
Low Power ◽  
High Gain ◽  
Power Source ◽  
Metal Oxide Semiconductors ◽  
Low Power Consumption ◽  
Light Weight ◽  
Solution Processed ◽  
Oxide Semiconductors

Flexible light weight In2O3-based source-gated transistors are achieved with high gain, fast saturation and low power consumption.

scholarly journals Realizing a Low-Power Head-Mounted Phase-Only Holographic Display by Light-Weight Compression

2020 ◽  
Vol 29 ◽  
pp. 4505-4515
Author(s):  
Burak Soner ◽  
Erdem Ulusoy ◽  
A. Murat Tekalp ◽  
Hakan Urey
Keyword(s):  
Low Power ◽  
Light Weight ◽  
Holographic Display

scholarly journals Ultrathin Tunable Lens Based on Boundary Tension Effect

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4018 ◽  
Author(s):  
Ao Yang ◽  
Jie Cao ◽  
Fanghua Zhang ◽  
Yang Cheng ◽  
Qun Hao
Keyword(s):  
Liquid Film ◽  
Small Volume ◽  
Optical Design ◽  
Optical Systems ◽  
Light Weight ◽  
Fabrication Method ◽  
Processing Mode ◽  
Liquid Lenses ◽  
Working Principle ◽  
Tunable Lens

Solid and liquid lenses are commonly used in optical design. Such lenses have suitable thicknesses due to their working principle and processing mode. Thus, zoom optical systems comprising solid and liquid lenses are extremely large. This work presents a new ultrathin tunable lens (UTL) comprising two liquid film lenses (LFLs) obtained through aspheric deformation and produced from the surface of a micro-liquid under gravity and boundary tension. The UTL can flexibly change focal lengths between positive and negative lenses when the device thickness is merely 2.15 mm. The proposed lens has the advantages of small volume, light weight, simple fabrication, and independence from external force during zooming. This research makes up for the drawback that traditional solid and liquid lenses cannot further reduce their thicknesses. The proposed UTL provides a new lens form and fabrication method, and can be used to replace solid and liquid lenses for designing miniature zoom optical systems.

scholarly journals Recent Advances in MEMS Metasurfaces and Their Applications on Tunable Lens

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 505 ◽  
Author(s):  
Shaowei He ◽  
Huimin Yang ◽  
Yunhui Jiang ◽  
Wenjun Deng ◽  
Weiming Zhu
Keyword(s):  
Structural Design ◽  
Microelectromechanical Systems ◽  
Cost Effective ◽  
Light Weight ◽  
Fast Speed ◽  
The Past ◽  
Recent Advances ◽  
Mems Technology ◽  
Pros And Cons ◽  
Tunable Lens

The electromagnetic (EM) properties of metasurfaces depend on both structural design and material properties. microelectromechanical systems (MEMS) technology offers an approach for tuning metasurface EM properties by structural reconfiguration. In the past 10 years, vast applications have been demonstrated based on MEMS metasurfaces, which proved to have merits including, large tunability, fast speed, small size, light weight, capability of dense integration, and compatibility of cost-effective fabrication process. Here, recent advances in MEMS metasurface applications are reviewed and categorized based on the tuning mechanisms, operation band and tuning speed. As an example, the pros and cons of MEMS metasurfaces for tunable lens applications are discussed and compared with traditional tunable lens technologies followed by the summary and outlook.

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