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Artificial eye boosted by hemispherical retina 期刊论文
NATURE, 2020, 581 (7808) : 264-265
作者:  Tregoning, John
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/03

An artificial eye has been reported that incorporates densely packed, nanometre-scale light sensors into a hemispherical retina-like component. Some of its sensory capabilities are comparable to that of its biological counterpart.


A sensory device that mimics the structure of the human eye.


  
Massively parallel coherent laser ranging using a soliton microcomb 期刊论文
NATURE, 2020, 581 (7807) : 164-+
作者:  Casanova, Emmanuelle;  Knowles, Timothy D. J.;  Bayliss, Alex;  Dunne, Julie;  Baranski, Marek Z.;  Denaire, Anthony;  Lefranc, Philippe;  di Lernia, Savino;  Roffet-Salque, Melanie;  Smyth, Jessica;  Barclay, Alistair;  Gillard, Toby;  Classen, Erich;  Coles, Bryony;  Ilett, Michael;  Jeunesse, Christian;  Krueger, Marta;  Marciniak, Arkadiusz;  Minnitt, Steve;  Rotunno, Rocco;  van de Velde, Pieter;  van Wijk, Ivo;  Cotton, Jonathan;  Daykin, Andy;  Evershed, Richard P.
收藏  |  浏览/下载:67/0  |  提交时间:2020/07/03

Coherent ranging, also known as frequency-modulated continuous-wave (FMCW) laser-based light detection and ranging (lidar)(1) is used for long-range three-dimensional distance and velocimetry in autonomous driving(2,3). FMCW lidar maps distance to frequency(4,5) using frequency-chirped waveforms and simultaneously measures the Doppler shift of the reflected laser light, similar to sonar or radar(6,7) and coherent detection prevents interference from sunlight and other lidar systems. However, coherent ranging has a lower acquisition speed and requires precisely chirped(8) and highly coherent(5) laser sources, hindering widespread use of the lidar system and impeding parallelization, compared to modern time-of-flight ranging systems that use arrays of individual lasers. Here we demonstrate a massively parallel coherent lidar scheme using an ultra-low-loss photonic chip-based soliton microcomb(9). By fast chirping of the pump laser in the soliton existence range(10) of a microcomb with amplitudes of up to several gigahertz and a sweep rate of up to ten megahertz, a rapid frequency change occurs in the underlying carrier waveform of the soliton pulse stream, but the pulse-to-pulse repetition rate of the soliton pulse stream is retained. As a result, the chirp from a single narrow-linewidth pump laser is transferred to all spectral comb teeth of the soliton at once, thus enabling parallelism in the FMCW lidar. Using this approach we generate 30 distinct channels, demonstrating both parallel distance and velocity measurements at an equivalent rate of three megapixels per second, with the potential to improve sampling rates beyond 150 megapixels per second and to increase the image refresh rate of the FMCW lidar by up to two orders of magnitude without deterioration of eye safety. This approach, when combined with photonic phase arrays(11) based on nanophotonic gratings(12), provides a technological basis for compact, massively parallel and ultrahigh-frame-rate coherent lidar systems.


  
A biomimetic eye with a hemispherical perovskite nanowire array retina 期刊论文
NATURE, 2020, 581 (7808) : 278-+
作者:  Hueckel, Theodore;  Hocky, Glen M.;  Palacci, Jeremie;  Sacanna, Stefano
收藏  |  浏览/下载:77/0  |  提交时间:2020/07/03

A biomimetic electrochemical eye is presented that has a hemispherical retina made from a high-density array of perovskite nanowires that are sensitive to light, mimicking the photoreceptors of a biological retina.


Human eyes possess exceptional image-sensing characteristics such as an extremely wide field of view, high resolution and sensitivity with low aberration(1). Biomimetic eyes with such characteristics are highly desirable, especially in robotics and visual prostheses. However, the spherical shape and the retina of the biological eye pose an enormous fabrication challenge for biomimetic devices(2,3). Here we present an electrochemical eye with a hemispherical retina made of a high-density array of nanowires mimicking the photoreceptors on a human retina. The device design has a high degree of structural similarity to a human eye with the potential to achieve high imaging resolution when individual nanowires are electrically addressed. Additionally, we demonstrate the image-sensing function of our biomimetic device by reconstructing the optical patterns projected onto the device. This work may lead to biomimetic photosensing devices that could find use in a wide spectrum of technological applications.


  
How Can We Motivate Consumers to Purchase Certified Forest Coffee? Evidence From a Laboratory Randomized Experiment Using Eye-trackers 期刊论文
ECOLOGICAL ECONOMICS, 2018, 150: 107-121
作者:  Takahashi, Ryo;  Todo, Yasuyuki;  Funaki, Yukihiko
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
Eye-tracking  Visual attention  Social experiment  Sustainability labels  Coffee certification  
Remotely-sensed imagery vs. eye-level photography: Evaluating associations among measurements of tree cover density 期刊论文
LANDSCAPE AND URBAN PLANNING, 2017, 157
作者:  Jiang, Bin;  Deal, Brian;  Pan, HaoZhi;  Larsen, Linda;  Hsieh, Chung-Heng;  Chang, Chun-Yen;  Sullivan, William C.
收藏  |  浏览/下载:14/0  |  提交时间:2019/04/09
Urban forestry  Tree cover density  Remotely-sensed imagery  Eye-level photography  Association  
Optimal design and routing of power lines; ecological technical and economic perspectives (OPTIPOL). Final Report, findings 2009 - 2014. 科技报告
来源:Center for International Climate and Environmental Research-Oslo (CICERO). 出版年: 2014
作者:  Bevanger, Kjetil Modolv;  Bartzke, Gundula;  Brøseth, Henrik;  Dahl, Espen Lie;  Gjershaug, Jan Ove;  Hanssen, Frank Ole;  Jacobsen, Karl Otto;  Kleven, Oddmund;  Kvaløy, Pål;  May, Roelof Frans;  Nygård, Torgeir;  Refsnæs, Steinar;  Stokke, Sigbjørn;  Thomassen, Jørn;  Meås, Roger
收藏  |  浏览/下载:29/0  |  提交时间:2019/04/05
fugl  NINA Rapport  dødelighet  kollisjon  syn  øye  korrosjon  overføringskapasitet  fargebelegg  bird  mortality  collision  vision  eye  corrosion  transmission capacity  colour coating  
Cataract Blindness and Simulation-Based Training for Cataract Surgeons: An Assessment of the HelpMeSee Approach 科技报告
来源:Rand Corporation. 出版年: 2012
作者:  James R. Broyles;  Peter Glick;  Jianhui Hu;  Yee-Wei Lim
收藏  |  浏览/下载:10/0  |  提交时间:2019/04/05
ꙸĿ뎈Ŀ  Military Families  Economists  Middle East  Wages andMelinda Moore, Michael Economists  Health Care Technology  Global Health  Developing Countries  Health Care Access  Eye Disorders  Health-related Quality Of Life  
Gaze maps for video sequences: use of eye tracker to record the gaze of viewers of video sequences 科技报告
来源:Center for International Climate and Environmental Research-Oslo (CICERO). 出版年: 2011
作者:  Shrestha, Raju
收藏  |  浏览/下载:4/0  |  提交时间:2019/04/05
Eye tracking  Gaze map  VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation, visualization, signal processing, image processing: 429  
Literature Review Report. Current and Future Eye Tracking Experiments on Web and Print Document Feature Attractiveness 科技报告
来源:Center for International Climate and Environmental Research-Oslo (CICERO). 出版年: 2010
作者:  Assefa, Mekides
收藏  |  浏览/下载:9/0  |  提交时间:2019/04/05
Eye tracking  website  VDP::Mathematics and natural science: 400::Information and communication science: 420::Simulation, visualization, signal processing, image processing: 429