Results 11 to 20 of about 4,282 (222)

Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses [PDF]

Sensors, 2020
In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental ...
Sergio Pérez-López, José Miguel Fuster, Pilar Candelas, Daniel Tarrazó-Serrano, Sergio Castiñeira-Ibáñez, Constanza Rubio   +5 more
doaj   +2 more sources

GPS Multipath Analysis Using Fresnel Zones [PDF]

Sensors, 2018
GNSS (Global Navigation Satellite Systems) multipath has been subject to scientific research for decades and although numerous methods and techniques have already been developed to mitigate this effect, it is still one of the accuracy-limiting factors in
Florian Zimmermann, Berit Schmitz, Lasse Klingbeil, Heiner Kuhlmann   +3 more
doaj   +3 more sources

Comparison of the results of restoring the radiation pattern of a conical horn antenna in the far zone based on measurements in the Fresnel zone at different positions of the antenna aperture center relative to the center of rotation [PDF]

Космические аппараты и технологии
Currently, antenna parameter measurement methods can be divided into two main groups: far-range and near-range methods. Long-range methods do not require expensive and complex equipment, but their implementation often requires an antenna range hundreds ...
Grits V. I.
doaj   +2 more sources

Broadband Achromatic Metalens in the Visible Light Spectrum Based on Fresnel Zone Spatial Multiplexing. [PDF]

Nanomaterials (Basel), 2022
Shi R, Hu S, Sun C, Wang B, Cai Q.
europepmc   +3 more sources

Study of the Off-Axis Fresnel Zone Plate of a Microscopic Tomographic Aberration. [PDF]

Sensors (Basel), 2022
Yang L, Ma Z, Liu S, Jiao Q, Zhang J, Zhang W, Pei J, Li H, Li Y, Zou Y, Xu Y, Tan X.   +11 more
europepmc   +3 more sources

Enhanced Terahertz Sensing via On-Chip Integration of Diffractive Optics with InGaAs Bow-Tie Detectors [PDF]

Sensors
The practical implementation of terahertz (THz) imaging and spectroscopic systems in real operational conditions requires them to be of a compact size, to have enhanced functionality, and to be user-friendly.
Karolis Redeckas, Vytautas Jakštas, Matas Bernatonis, Vincas Tamošiūnas, Gintaras Valušis, Linas Minkevičius   +5 more
doaj   +2 more sources

3D Nanofabrication of High-Resolution Multilayer Fresnel Zone Plates. [PDF]

Adv Sci (Weinh), 2018
Sanli UT, Jiao C, Baluktsian M, Grévent C, Hahn K, Wang Y, Srot V, Richter G, Bykova I, Weigand M, Schütz G, Keskinbora K.   +11 more
europepmc   +3 more sources

Four-Ce:Nd:YAG-rod solar laser with 4.49% conversion efficiency through Fresnel lens [PDF]

Scientific Reports
The development of solar laser systems that combine high efficiency and cost-effectiveness is key to the practical implementation of this renewable technology. This paper presents the outcomes of the assessment of a solar laser prototype performed in the
Hugo Costa, Dawei Liang, Joana Almeida, Bruno D. Tibúrcio, Cláudia R. Vistas   +4 more
doaj   +2 more sources

Author Correction: Nanofocusing of hard X-ray free electron laser pulses using diamond based Fresnel zone plates. [PDF]

Sci Rep, 2020
David C, Gorelick S, Rutishauser S, Krzywinski J, Vila-Comamala J, Guzenko VA, Bunk O, Färm E, Ritala M, Cammarata M, Fritz DM, Barrett R, Samoylova L, Grünert J, Sinn H.   +14 more
europepmc   +3 more sources

Author Correction: Towards Millimeter-wavelength: Transmission-Mode Fresnel-Zone Plate Lens Antennas using Plastic Material Porosity Control in Homogeneous Medium. [PDF]

Sci Rep, 2018
Pourahmadazar J, Denidni TA.
europepmc   +3 more sources