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Listar por autor "Pérez López, Sergio"

Mostrando ítems 1-20 de 24

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Acoustic Focusing Enhancement In Fresnel Zone Plate Lenses

Tarrazó-Serrano, Daniel; Pérez-López, Sergio; Candelas Valiente, Pilar; Uris Martínez, Antonio; Rubio Michavila, Constanza (Nature Publishing Group, 2019)

[EN] The development of flat acoustic lenses for different applications such as biomedical engineering is a topic of great interest. Flat lenses like Fresnel Zone Plates (FZPs) are capable of focusing energy beams without ...
Analysis of Fresnel Zone Plates Focusing Dependence on Operating Frequency

Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Castiñeira Ibáñez, Sergio; Pérez López, Sergio; Rubio Michavila, Constanza (MDPI AG, 2017)

[EN] The focusing properties of Fresnel Zone Plates (FZPs) against frequency are analyzed in this work. It is shown that the FZP focal length depends almost linearly on the operating frequency. Focal depth and focal ...
Analysis of Predistortion Techniques on Fresnel Zone Plates in Ultrasound Applications

Fuster Escuder, José Miguel; Pérez-López, Sergio; Belmar Ibáñez, Francisco; Candelas Valiente, Pilar (MDPI AG, 2021-08)

[EN] In this work, we analyze the effect of predistortion techniques on the focusing profile of Fresnel Zone Plates (FZPs) in ultrasound applications. This novel predistortion method is based on either increasing or ...
Análisis de la eficiencia de lentes de Fresnel acústicas

Pérez López, Sergio (Universitat Politècnica de València, 2019-08-01)

[ES] En este trabajo se ha realizado un estudio teórico de la eficiencia de transmisión de lentes de Fresnel. Los resultados muestran que la distribución de las regiones transparentes y opacas de la lente no influye cuando ...
Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses

Pérez-López, Sergio; Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Tarrazó-Serrano, Daniel; Castiñeira Ibáñez, Sergio; Rubio Michavila, Constanza (MDPI AG, 2020)

[EN] 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 ...
Caracterización Basada en Imagen de la Función de Transferencia de Modulación de Instrumentos Ópticos para Teledetección

Pérez López, Sergio (Universitat Politècnica de València, 2020-05-13)

[ES] Los satélites con instrumentos ópticos pasivos son ampliamente utilizados para la teledetección de la superficie terrestre, con aplicaciones que abarcan desde la cartografía hasta la monitorización de recursos naturales. ...
Caracterización de un generador y un receptor de corriente continua

Rubio Michavila, Constanza; Gasque Albalate, Maria Concepcion; Pérez López, Sergio; Llopis Cosin, Juan Vicente (Universitat Politècnica de València, 2020-05-04)

El objetivo de este screencast es, por tanto, obtener las curvas características de un generador y de un receptor de corriente continua. Además, se calculará el rendimiento de ambos elementos. Como generador de corriente ...
Caracterización experimental de la dispersión temporal y angular del canal radio a 60 GHz

Pérez López, Sergio (Universitat Politècnica de València, 2017-12-02)

In this Final Degree Project it has been analyzed an experimental characterization of angular spread and temporal spread main parameters from the radio propagation channel. Temporal spread characterization has been made ...
Design of Acoustic Bifocal Lenses Using a Fourier-Based Algorithm

Fuster Escuder, José Miguel; Pérez-López, Sergio; Candelas Valiente, Pilar (MDPI AG, 2021-12)

[EN] In this work, we develop a new design method based on fast Fourier transform (FFT) for implementing zone plates (ZPs) with bifocal focusing profiles. We show that the FFT of the governing binary sequence provides a ...
Design of Acoustic Lenses for Ultrasound Focusing Applications

Pérez López, Sergio (Universitat Politècnica de València, 2022-01-17)

[ES] La focalización de ultrasonidos tiene muchas aplicaciones en una gran variedad de áreas tanto científicas como industriales. Los ultrasonidos focalizados son una de las herramientas principales usada por médicos en ...
Design of Binary-Sequence Zone Plates in High Wavelength Domains

Fuster Escuder, José Miguel; Pérez-López, Sergio; Candelas Valiente, Pilar; Rubio Michavila, Constanza (MDPI AG, 2018)

[EN] The design of zone plates is an important topic in many areas of physics, such as optics, X-rays, microwaves or ultrasonics. In this paper, a zone plate design method, which provides high flexibility in the shaping ...
Determicación del campo magnético terrestre

Rubio Michavila, Constanza; Gasque Albalate, Maria Concepcion; Pérez López, Sergio; Llopis Cosin, Juan Vicente (Universitat Politècnica de València, 2020-06-05)

El campo magnético terrestre se genera como consecuencia del movimiento de los metales líquidos en el centro de la Tierra, debido a los movimientos de traslación y rotación terrestre. El campo magnético terrestre es una ...
Fractal lenses based on Cantor binary sequences for ultrasound focusing applications

Pérez-López, Sergio; Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Rubio Michavila, Constanza (Elsevier, 2019)

[EN] In this work, we demonstrate the application of Cantor fractal lenses in acoustics. The Cantor Zone Plate (CZP), previously introduced in optics, is designed from a conventional Fresnel Zone Plate (FZP) using a binary ...
Liquid-liquid core-shell configurable mesoscale spherical acoustic lens with subwavelength focusing

Pérez-López, Sergio; Candelas Valiente, Pilar; Fuster Escuder, José Miguel; Rubio Michavila, Constanza; Minin, Oleg V.; Minin, Igor V. (Japan Society of Applied Physics, 2019)

[EN] In this work, we present a lens based on a thin hollow ABS spherical container structure, which can be filled up with different compatible liquids. The acoustic jet can be dynamically shaped by either shifting the ...
M-Bonacci Zone Plates for Ultrasound Focusing

Pérez-López, Sergio; Fuster Escuder, José Miguel; Candelas Valiente, Pilar (MDPI AG, 2019-10)

[EN] In this work, we present a thorough analysis on M-bonacci zone plates for ultrasound focusing applications. These planar lenses are capable of providing bifocal focusing profiles with equal intensity in both foci and ...
Medida de la temperatura mediante un sensor termorresistivo (RTD)

Gasque Albalate, Maria Concepcion; Llopis Cosin, Juan Vicente; Pérez López, Sergio; Rubio Michavila, Constanza (Universitat Politècnica de València, 2020-05-04)

Se explica un procedimiento para la medida de la temperatura de un líquido a temperatura ambiente en el laboratorio utilizando una termorresistencia. Previamente se comprueba el modelo matemático.
Observation of ultrasonic Talbot effect in perforated plates

Candelas Valiente, Pilar; Fuster Escuder, José Miguel; Pérez-López, Sergio; Uris Martínez, Antonio; Rubio Michavila, Constanza (Elsevier, 2019)

[EN] The Talbot effect using ultrasonic waves transmitted through a periodic perforated plate is presented. The ultrasonic wave-field at the exit of the perforated plate replicates the perforated pattern at the Talbot ...
On the Design of Soret Zone Plates based on Binary Sequences using Directional Transducers

Candelas Valiente, Pilar; Pérez-López, Sergio; Fuster Escuder, José Miguel (MDPI AG, 2021-09)

[EN] In this work, we analyze the effect of the distribution of transparent Fresnel regions over the focusing profile of Soret Zone Plates (SZP) based on binary sequences. It is shown that this effect becomes very significant ...
On the focusing enhancement of Soret zone plates with ultrasound directional transducers

Pérez-López, Sergio; Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Rubio Michavila, Constanza (American Institute of Physics, 2019-06-03)

[EN] This work analyzes the influence of the distribution of transparent Fresnel regions over the focusing profile of Soret Zone Plates. It is shown that this effect becomes very significant in those fields where directional ...
On the use of phase correction rings on Fresnel zone plates with ultrasound piston emitters

Sergio Pérez-López; Fuster Escuder, José Miguel; Candelas Valiente, Pilar; Rubio Michavila, Constanza; Belmar Ibáñez, Francisco (American Institute of Physics, 2018)

[EN] In this work, the distortion of the Fresnel Zone Plate focusing profile generated by a piston emitter in ultrasound applications is significantly reduced through the use of phase correction rings, which compensate the ...