Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Pilar Candelas"'
Publikováno v:
Scientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
Abstract Ultrasound focusing is a hot topic due to its multiple applications in many fields, including biomedical imaging, thermal ablation of cancerous tissues, and non destructive testing in industrial environments. In such applications, the abilit
Externí odkaz:
https://doaj.org/article/9e00820c0fa043448aaf2fab64b52a2e
Publikováno v:
Sensors, Vol 21, Iss 24, p 8285 (2021)
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 discrete sequence of the same lengt
Externí odkaz:
https://doaj.org/article/2aea9e16c927432380db0ac372109b1d
Publikováno v:
Sensors, Vol 21, Iss 18, p 6086 (2021)
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 in those fields where directi
Externí odkaz:
https://doaj.org/article/882fe01393924bdb9fda797362e32722
Publikováno v:
Sensors, Vol 21, Iss 15, p 5066 (2021)
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 decreasing the width of some of the FZP
Externí odkaz:
https://doaj.org/article/6ea7ddfd63674e419010bf30603fbddf
Autor:
Sergio Pérez-López, Daniel Tarrazó-Serrano, Dimitry O. Dolmatov, Constanza Rubio, Pilar Candelas
Publikováno v:
Sensors, Vol 20, Iss 23, p 6824 (2020)
Fresnel Zone Plates are planar lenses that can be used to focus ultrasound beams. This kind of acoustic lenses can play a key role in the resolution of ultrasonic NDT systems. In this type of pulse-echo applications, the pulse duration is an importan
Externí odkaz:
https://doaj.org/article/5657d0f68abc43a5a72ddc632af8df36
Autor:
Sergio Pérez-López, José Miguel Fuster, Pilar Candelas, Daniel Tarrazó-Serrano, Sergio Castiñeira-Ibáñez, Constanza Rubio
Publikováno v:
Sensors, Vol 20, Iss 3, p 705 (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
Externí odkaz:
https://doaj.org/article/aa31de79fa0d48e8bd9c8c35886aaf3b
Publikováno v:
Sensors, Vol 14, Iss 5, Pp 8821-8828 (2014)
The lensing capabilities of a single subwavelength slit surrounded by a finite array of grooves milled into a brass plate is presented. The modulation of the beam intensity of this ultrasonic lens can be adjusted by varying the groove depth. Numerica
Externí odkaz:
https://doaj.org/article/3387a4017b02464e98fcc5a41948d876
Publikováno v:
Sensors, Vol 19, Iss 19, p 4313 (2019)
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 become very appealing for a wide
Externí odkaz:
https://doaj.org/article/4577025ee7494c009e4689c53b2ecee4
Publikováno v:
Sensors, Vol 19, Iss 18, p 3919 (2019)
A method of detecting dielectric objects hidden behind an opaque barrier located on a reflective background, based on the distortion of interference fringes, is proposed in this article. Experiments conducted in the millimeter wavelength range demons
Externí odkaz:
https://doaj.org/article/e487225f703b408f885fd3507bc1987d
Autor:
Daniel Tarrazó-Serrano, Sergio Castiñeira-Ibáñez, Oleg V. Minin, Pilar Candelas, Constanza Rubio, Igor V. Minin
Publikováno v:
Sensors, Vol 19, Iss 2, p 378 (2019)
The image performance of acoustic and ultrasound sensors depends on several fundamental parameters such as depth of focus or lateral resolution. There are currently two different types of acoustic diffractive lenses: those that form a diffraction-lim
Externí odkaz:
https://doaj.org/article/062c6e1bf3f9405984a28d34fe6a5ab1