Antonio M. Pozo

Antonio M. Pozo
University of Granada | UGR · Department of Optics

Associate professor

About

34
Publications
10,862
Reads
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214
Citations
Citations since 2017
3 Research Items
105 Citations
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Publications

Publications (34)
Article
Full-text available
Carbon monoxide (CO) is a highly toxic gas, which can cause death if it is inhaled in small quantities for a long time or in large quantities for a short time. Since this gas can be lethal, it is essential to detect it from minute to large concentrations. Our study consists of the design of a superficial plasmonic resonance (SPR) CO sensor of tiny...
Article
Surface plasmons are a revolution in nanophotonics because they permit the transport of energy along metal-dielectric interfaces, something which is of vital importance in sensors which measure refractive indexes. The aim of this research has been the design and optimization of several surface plasmon resonance (SPR) sensors to measure the refracti...
Article
Signposting and illuminating obstacles is meant to reduce risks to aircraft by aiding the pilot in locating dangers. However, many of the obstacles to air transport, such as telecommunication towers, can surpass heights of 45 m. This implies that the installation or repair of the beacon system can involve serious risks to the personnel in charge of...
Article
Full-text available
A standard problem in large tanks at oil refineries and petrol stations is that water and fuel usually occupy the same tank. This is undesirable and causes problems such as corrosion in the tanks. Normally, the water level in tanks is unknown, with the problems that this entails. We propose herein a method based on surface plasmon resonance (SPR) t...
Article
When an array of LEDs has to be repaired in or removed from a traffic light, it is necessary interrupt traffic. A lift has to elevate workers to the traffic-light disks, entailing job-safety dangers, high costs, and traffic disruption. To allay some of these problems, we have designed a new illumination system with LEDs, using minilenses set into t...
Article
Full-text available
Background In this work, we propose the Halo test, a simple visual test based on a freeware software for quantifying and displaying night-vision disturbances perceived by subjects under different experimental conditions, more precisely studying the influence of the alcohol consumption on visual function. Methods In the Halo test, viewed on a monit...
Article
Full-text available
Purpose. To evaluate the influence of alcohol consumption on the retinal-image quality and visual performance under surrounding low-illumination conditions. Methods. A volunteer sample of 67 subjects was analyzed. Optical quality of the eye was evaluated by means of the Strehl ratio, the Objective Scattering Index (OSI), and the tear-film quality....
Article
Full-text available
In this work we studied the color dependence with a horizontal-viewing angle and colorimetric characterization of two liquid-crystal displays (LCD) using two different backlighting: Cold Cathode Fluorescent Lamps (CCFLs) and light-emitting diodes (LEDs). The LCDs studied had identical resolution, size, and technology (TFT - thin film transistor). T...
Article
Full-text available
Spectroradiometric measurements have been made for the experimental characterization of the RGB channels of autostereoscopic 3D displays, giving results for different measurement angles with respect to the normal direction of the plane of the display. In the study, 2 different models of autostereoscopic 3D displays of different sizes and resolution...
Article
Full-text available
An analysis has been made of the stability of the images generated by electronic autostereoscopic 3D displays, studying the time course of the photometric and colorimetric parameters. The measurements were made on the basis of the procedure recommended in the European guideline EN 61747-6 for the characterization of electronic liquid-crystal displa...
Article
Full-text available
In recent years, flat-panel display (FPD) technology has undergone great development, and now FPDs appear in many devices. A significant element in FPD manufacturing is the display front surface. Manufacturers sell FPDs with different types of front surfaces, which can be matte (also called anti-glare) or glossy screens. Users who prefer glossy scr...
Conference Paper
Full-text available
In this work, we present a teaching methodology using active-learning techniques in the course “Devices and Instrumentation” of the Erasmus Mundus Master's Degree in “Color in Informatics and Media Technology” (CIMET). A part of the course “Devices and Instrumentation” of this Master's is dedicated to the study of image sensors and methods to evalu...
Conference Paper
In this work, we present a low-cost experimental setup to evaluate the image quality of digital-camera sensors, which can be implemented in undergraduate and postgraduate teaching. The method consists of evaluating the modulation transfer function (MTF) of digital-camera sensors by speckle patterns using a ping-pong ball as a diffuser, with two han...
Conference Paper
The European Higher Education Area (EHEA) proposes substantial changes in the teaching-learning model, moving from a model based mainly on the activity of teachers to a model in which the true protagonist is the student. This new framework requires that students develop new abilities and acquire specific skills. This also implies that the teacher s...
Article
Full-text available
Charge-coupled device (CCD) and complementary metal-oxide semiconductor (CMOS) matrices offer excellent features in imaging systems. For assessing the suitability of each technology according to the application, the complete characterization of the detector arrays becomes necessary. A system is optically characterized by the modulation transfer fun...
Article
Full-text available
In recent years, the flat-panel display (FPD) technology has undergone great development. Currently, FPDs are present in many devices. A significant element in FPD manufacturing is the display front surface. Manufacturers sell FPDs with different types of front surface which can be matte (also called anti-glare) or glossy screens. Users who prefer...
Article
Today, video cameras connected to frame grabbers or video capture cards (VCCs) are used in many applications such as traffic control, surveillance, medical systems or machine vision. In this work, we present a method for determining the spatial-frequency response of VCCs. This method is based on the modulation transfer function (MTF) determination...
Article
Charge-coupled device (CCD) and complementary metal-oxide semiconductor (CMOS) matrices offer excellent features in imaging systems. A suitability evaluation of either technology according to a specific application requires a complete characterization of the different detector types. A system is optically characterized by the modulation transfer fu...
Article
Tesis Univ. Granada. Departamento de Óptica. Leída el 6 de noviembre de 2008
Article
Full-text available
We present a method for comparing the optical quality of spectacle lenses based on determining the modulation transfer function (MTF) using random-dot patterns. Furthermore, we determine the precision of the method under repeatability conditions of measurement. The experimental device is composed of a laptop computer in which the LCD monitor presen...
Article
This study analyses the way that the disc structure of the cone outer segment of the human retina affects light propagation through the cones, and how it influences the Stiles–Crawford effect of the first kind (SCE I). For this, we have used the finite-difference time-domain method (FDTD), enabling a numerical solution of Maxwell's equations. The i...
Article
Full-text available
Today, CCD and CMOS detector arrays present excellent features in imaging systems. To investigate the suitability of each technology according to various applications, in this work we have comparatively studied the quality of the images provided by different cameras. To this end we have used the speckle method to determine the modulation transfer f...
Article
Full-text available
Usually, although not always, manufacturers producing optical fiber state that the functioning will be single mode in most cases without specifying the wavelengths to be worked with. A rapid method of light simulation within the optical fibers was developed for a single-mode characterization, which avoids errors and problems in transmitting the sig...
Article
Full-text available
We present and evaluate two corrections applicable in determining the modulation transfer function (MTF) of a charge-coupled device (CCD) by the speckle method that minimize its uncertainty: one for the low frequency region and another for the high frequency region. The correction at the low-spatial-frequency region enables attenuation of the high...
Article
Full-text available
A method is presented for measuring the modulation transfer function of ophthalmic lenses by use of the generation of laser speckle with an integrating sphere. The measurements are performed with a rectangular double-slit aperture positioned at the output port of the integrating sphere. The distance between the lens and the detector determines the...
Article
In this work, we analyse the propagation of light in the human retinal cones by the finite-difference time-domain method (FDTD) in cylindrical coordinates, for systems with axial symmetry or body of revolution (BOR). This work constitutes a preliminary approach to the study of the Stiles–Crawford effect of the first kind (SCE I), as a cone has been...
Article
Full-text available
Two methods for measuring the modulation transfer function (MTF) of a charge-coupled device (CCD) that are based on the generation of laser speckle are analyzed and compared. The method based on a single-slit aperture is a quick method, although the measurements are limited to values of less than the Nyquist frequency of the device. The double-slit...
Conference Paper
Full-text available
De igual manera que se utilizan las funciones de mezcla para predecir igualaciones de color ya sean metámeras o isómeras [1], también pueden emplearse los fundamentales fisiológicos correspondientes a las largas (L), medias (M), y cortas (S) longitudes de onda [2]. Si se utiliza como método aplicado a los estímulos generados por un colorímetro, pod...
Article
We present the discretized equations of the 12 PML (perfectly matched layer) in the three-dimensional case using the Cartesian geometry. These equations can be used in different fields where Maxwell equations need to be solved.

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