Results 41 to 50 of about 5,580 (232)
Accelerating and abruptly-autofocusing beam waves in the Fresnel zone of antenna arrays [PDF]
, 2013 We introduce the concept of spatially accelerating (curved) beam waves in the Fresnel region of properly designed antenna arrays. These are transversely localized EM waves that propagate in free space in a diffraction-resisting manner, while at the same ...
Chremmos, Ioannis +2 more
core +1 more source
Lightweight smart autofocusing eyeglasses
MOEMS and Miniaturized Systems XVII, 2018 More than 100 million people in the United States of America alone suffer from age-related presbyopia caused by a loss of focal accommodation of the eye crystalline lens as the lens stiffens with age. The resulting accommodative error or lag produces blurred images of objects placed at different distances.
N, Hasan +6 more
openaire +3 more sources
zPIE: an autofocusing algorithm for ptychography [PDF]
Optics Letters, 2020 An autofocusing algorithm for ptychography is proposed. The method optimizes a sharpness metric that would be observed in a differential interference microscope and is valid for both amplitude and phase modulating specimens. We experimentally demonstrate that the algorithm, based on the extended ptychographic iterative engine (ePIE), calibrates the ...
Loetgering, Lars +3 more
openaire +3 more sources
International Journal of Aerospace Engineering, 2016 In order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated.
Zhichao Chen, Tao Zhang
doaj +1 more source
Implementation and Optimization of a Dual-confocal Autofocusing System
Sensors, 2020 This paper describes the implementation and optimization of a dual-confocal autofocusing system that can easily describe a real-time position by measuring the response signal (i.e., intensity) of the front and the rear focal points of the system. This is
Chia-Ming Jan +2 more
doaj +1 more source
A Workstation for microassembly [PDF]
, 2007 In this paper, an open-architecture, reconfigurable microassembly workstation for efficient and reliable assembly of micromachined parts is presented.
Kunt, Emrah Deniz +2 more
core +1 more source
Correcting Presbyopia With Autofocusing Liquid-Lens Eyeglasses [PDF]
IEEE Transactions on Biomedical Engineering, 2022 12 pages, 13 ...
Mohit U. Karkhanis +7 more
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Manipulating self-focusing beams induced by high-dimensional parabolic umbilic beams
Results in Physics, 2023 The excellent property that the intensity of autofocusing beams in the focal plane increases exponentially, makes them especially beneficial for biomedical treatment.
Zhuo Sun +4 more
doaj +1 more source
Sensors, 2023 Multiple autonomous underwater vehicles (AUVs) have gradually become the trend in underwater operations. Identifying and detecting these new underwater multi-targets is difficult when studying underwater moving targets. A 28-element transducer is used to
Xiaofeng Yin +3 more
doaj +1 more source
A nonquadratic regularization-based technique for joint SAR imaging and model error correction [PDF]
, 2008 Regularization based image reconstruction algorithms have successfully been applied to the synthetic aperture radar (SAR) imaging problem. Such algorithms assume that the mathematical model of the imaging system is perfectly known.
Cetin, Mujdat +3 more
core +1 more source