Results 11 to 20 of about 40,593 (282)
Photonics, 2023 The large-aperture space camera needs gravity unloading in the ground imaging quality test. The multi-point gravity balance method is mainly applied to the object with symmetrical structure and regular mass distribution, such as the primary mirror of the
Lihao Zhang +3 more
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Calculation of Temperature Rise in Multi-layer Biological Tissue Based on Large Aperture Concave Sphere Focused Ultrasonic Transducer [PDF]
Iranian Journal of Medical Physics, 2023 Introduction: The large aperture concave spherical focused ultrasonic transducer has stronger acoustic focusing effect and can obtain good temperature rise effect. The purpose of this study was to explore the effect of different frequency, duty cycle and
HU DONG +3 more
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Compact multi-aperture imaging with high angular resolution [PDF]
Journal of the Optical Society of America A, 2015 Previous reports have demonstrated that it is possible to emulate the imaging function of a single conventional lens with an N×N array of identical lenslets to provide an N-fold reduction in imaging-system track length. This approach limits the application to low-resolution imaging.
Carles Santacana, Guillem +4 more
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Fourier Ptychography with Scheimpflug Optics for Multi-Aperture Applications [PDF]
, 2017 We present a new optical configuration using the Scheimpflug principle for Fourier ptychography microscopy. This configuration minimizes the aberrations present in the off-axis lenses of a multi-aperture Fourier ptychography setup. A 3D printed setup was
Harvey, Andrew R. +2 more
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Sensors, 2014 In extremely low-light conditions, random telegraph signal (RTS) noise and dark current white defects become visible. In this paper, a multi-aperture imaging system and selective averaging method which removes the RTS noise and the dark current white ...
Bo Zhang +5 more
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Micromachines, 2022 As a widely clinical detection method, ultrasonography (US) has been applied to the diagnosis of breast cancer. In this paper, the multi-element synthetic aperture focusing (M-SAF) is applied to the ring array of breast ultrasonography (US) imaging ...
Yang Wu +8 more
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Digital equalization of time-delay array receivers on coherent laser communications [PDF]
, 2017 © [2017 Optical Society of America.]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the ...
Belmonte Molina, Aniceto
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A Novel Multi-Aperture Based Sun Sensor Based on a Fast Multi-Point MEANSHIFT (FMMS) Algorithm
Sensors, 2011 With the current increased widespread interest in the development and applications of micro/nanosatellites, it was found that we needed to design a small high accuracy satellite attitude determination system, because the star trackers widely used in ...
Gao-Fei Zhang +3 more
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Ultrasonic Synthetic Apertures: Review
Archives of Acoustics, 2014 In the paper the concept of synthetic aperture used for high resolution/high frame rate ultrasonic imaging is reviewed. The synthetic aperture technique allows building extended “virtual” apertures, synthesized from smaller real aperture resulting in ...
Andrzej NOWICKI, Barbara GAMBIN
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The NRL Multi Aperture SAR system [PDF]
2015 IEEE Radar Conference (RadarCon), 2015 This paper describes the Naval Research Laboratory Multi Aperture Synthetic Aperture Radar (NRL MSAR) and presents initial results from the first field deployment of this system. The NRL MSAR is an airborne test bed designed to investigate remote sensing and surveillance applications that exploit multiple along-track phase centers, in particular ...
Mark Sletten +4 more
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