Información del autor
Autor Bernabeu Martínez, Eusebio |
Documentos disponibles escritos por este autor (123)
texto impreso
González Montes, Mario ; Martínez Antón, Juan Carlos ; Vázquez Moliní, Daniel ; Álvarez Fernández Balbuena, Antonio ; Bernabeu Martínez, Eusebio | Hindawi Publishing Corporation | 2014This work is aimed to design and evaluate different achromatic Fresnel lens solutions capable of operating as concentrators aimed at photovoltaic cells systems. Throughout this study, the theoretical parametric design of the achromatic lens will[...]texto impreso
Álvarez Herrero, Alberto ; López Heredero, Raquel ; Levy, David ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2001-02-01The variation of the optical properties of porous Vycor glass (Corning, Model 7930) under different relative-humidity conditions was studied. The adsorption of water into the glass pores was investigated with spectroscopic ellipsometry. The chan[...]texto impreso
An electronic charge compensation device (ECCD) is a passive device that carries electrical currents away, on time, to the electrical Earth field. It prevents lightning’s impacts, derivative electric current pulses, and reduces the radiofrequenc[...]texto impreso
Álvarez Herrero, Alberto ; Guerrero Padrón, Héctor ; Levy, David ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-11-01An optical method to determine the nanostructure and the morphology of porous thin films is presented. This procedure is based on the response of a side-polished optical fiber with the film under study, when an adsorption-desorption cycle is car[...]texto impreso
Quiroga Mellado, Juan Antonio ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1998-09-01An algorithm for accurately extracting the local fringe direction is presented. The algorithm estimates, in the neighborhood of n × n points, the direction of the gradient that points normal to the local fringe direction. The performance of four[...]texto impreso
González Montes, Mario ; Vázquez Moliní, Daniel ; Álvarez Fernández Balbuena, Antonio ; Bernabeu Martínez, Eusebio | Society of Photo-optical Instrumentation Engineers | 2014-06-20New aeronautical ground lighting techniques are becoming increasingly important to ensure the safety and reduce the maintenance costs of the plane's tracks. Until recently, tracks had embedded lighting systems whose sources were based on incande[...]texto impreso
Gómez Pedrero, José Antonio ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2001-07We present a new algorithm to calculate the optical imbalances and differential prismatic effects that appear when two eyes look at an object through correcting eyeglasses. These are important magnitudes in ophthalmic optics because large amount[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Vázquez Moliní, Daniel ; Álvarez Fernández-Balbuena, Antonio ; Bernabeu Martínez, Eusebio ; García Botella, Ángel ; Herráenz Ferreiro, Juan Antonio ; Egido Rodríguez, Marian, del | SPIE | 2009-08-22This work is intended to deal with the problems which arise when illuminanting Paleolithic cave paintings. We have carried out the spectral and colorimetric characterization of some paintings located in the Murcielagos (bats) cave (Zuheros, Córd[...]texto impreso
Bernabeu Martínez, Eusebio ; Sánchez Brea, Luis Miguel ; Siegmann, Philip ; Martínez Antón, Juan Carlos ; Gómez Pedrero, José Antonio ; Wilkening, Günter ; Koenders, Ludger ; Müller, Franz ; Hildebrand, M. ; Hermann, Harti | Elsevier Science B. V. | 2001-08-16In this report a classification of the main surface structures found on fine metallic wires is carried out (between ?20 and 500 ?m in diameter). For this, we have analyzed a series of wires of different metallic materials, diameters and producti[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Salgado Remacha, Francisco Javier ; Morlanes Calvo, Tomás ; Jiménez Castillo, Isidoro ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2010-06-10We present a collimation technique based on a double grating system to locate with high accuracy an emitter in the focal plane of a lens. Talbot self-images are projected onto the second grating producing moiré interferences. By means of two pho[...]texto impreso
Quiroga Mellado, Juan Antonio ; Alonso Fernández, José ; Zoido, J. ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1994-09-10Least-squares approximation can be used in image-based colorimetry once the set of sampling functions is selected. We discuss the accuracy obtained in earlier research, and we compare it with a better calculation method.texto impreso
Siegmann, Philip ; Sánchez Brea, Luis Miguel ; Martínez Antón, Juan Carlos ; Bernabeu Martínez, Eusebio | Elsevier Science B. V. | 2004-11-15Conventional microscopy techniques, such as atomic force microscopy (AFM), scanning electron microscopy (SEM), and confocal microscopy (CM) are not suitable for on-line surface inspection of fine metallic wires. In the recent years, some optical[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2009-10-20We analyze the Talbot effect produced by a mask composed of two diffraction gratings. Combinations with phase and amplitude gratings have been studied in the near-field regime. For a two-phase-gratings configuration, the Talbot effect is cancele[...]texto impreso
Saez Landete, José ; Alonso Fernández, José ; Sánchez Brea, Luis Miguel ; Morlanes Calvo, Tomás ; Bernabeu Martínez, Eusebio | Optical Society of America | 2009-09-01Two-grating measurement systems are routinely employed for high-resolution measurements of angular and linear displacement. Usually, these systems incorporate zero reference codes (ZRCs) to obtain a zero reference signal (ZRS), which is used as [...]texto impreso
Espinosa Luna, Rafael ; Atondo Rubio, Gelacio ; Bernabeu Martínez, Eusebio ; Hinojosa Ruiz, Sinhué Lizandro | Gustav Fischer Verlag | 2010A number of depolarization metrics is applied to a series of reported Mueller matrices. It is shown the depolarization scalar metric Q(M) provides consistent results with the reported scalar metrics like the depolarization index and the degree o[...]texto impreso
Peral Cerdá, Assumpta ; Alonso Fernández, José ; Canos Sanz, Joán ; Bernabeu Martínez, Eusebio | Elsevier Science B. V. | 2000-11The warpage of a set of six hard resin spherical lenses was measured when they were compressed by means of the tangential force exerted by a metal frame. The technique employed to measure the lenses improves over previous work both because great[...]texto impreso
Kamal Abd El-Hady, Hala ; Alda, Javier ; Vázquez Moliní, Daniel ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2004In this paper we analyze different alternatives in the design of optimized optical arrays having spatial integration feature in a plane arrangement. More specifically, we focus our attention in the evaluation of the number of useful individual u[...]texto impreso
Herrera Fenández, José María ; Vilas, José Luis ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Optical Society of America | 2015-11-20A superachromatic quarter-wave retarder using an arbitrary number of waveplates in a broadband spectral range has been proposed. Their design is based on the optimization of a merit function, the achromatism degree (AcD), which represents a glob[...]texto impreso
Saez Landete, José ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-05-30A method to obtain the absolute measure of the position is by means of the autocorrelation of two zero reference marks. In one-axis measurement systems one dimensional mark are used and the design of these marks is relatively complex. When the m[...]texto impreso
Saez Landete, José ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-01-10The grating measurement systems can be used for displacement and angle measurements. They require of zero reference codes to obtain zero reference signals and absolute measures. The zero reference signals are obtained from the autocorrelation of[...]texto impreso
Tejeda, César ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2004-03-01We propose a model for determining the far-field diffraction pattern of wires with waviness. Analytical solutions are obtained by means of the stationary phase method, which allows us to determine dimensional parameters such as wire diameter and[...]texto impreso
Quiroga Mellado, Juan Antonio ; Martínez Antón, Juan Carlos ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio ; Álvaro Labajo, M. ; Cortés Testillano, V. | SPIE--The International Society for Optical Engineering. | 2001We provide a simple solution for the particular problem of the in-service inspection of aeronautic surfaces in order to detect bumps that otherwise it is made visually and usually less reliably. Bumps and other surface defects can be a symptom o[...]texto impreso
Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-06-01In optical metrology the final experimental result is normally an image acquired with a CCD camera. Owing to the sampling at the image, an interpolation is usually required. For determining the error in the measured parameters with that image, k[...]texto impreso
In this paper we present a model to determine the light scattered by a metallic cylinder when it is illuminated with a light beam in oblique incidence. This model is based on an approximate solution to the Helmholtz-Kirchhoff integral by means o[...]texto impreso
Siegmann, Philip ; Sánchez Brea, Luis Miguel ; Martínez Antón, Juan Carlos ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2002We present an analytical model to obtain the diffraction pattern in far field of a metallic, thick slit based on the Geometrical Theory of Diffraction. The edges of the slit are modelled as semicylinders. We have considered that the thickness of[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2008-11-24We analyze the far field and near field diffraction pattern produced by an amplitude grating whose strips present rough edges. Due to the stochastic nature of the edges a statistical approach is performed. The grating with rough edges is not pur[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2008-12-01Steel tape gratings are used in different metrology applications. As the period of these gratings was large (around 100?m,), its analytical study has been performed, up to date, using a geometrical approach. Nowadays, steel tape gratings can be [...]texto impreso
Herrera Fernández, José María ; Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Morlanes Calvo, Tomás ; Bernabeu Martínez, Eusebio | IOP Publishing | 2016-06-14We propose an accurate technique for obtaining highly collimated beams, which also allows testing the collimation degree of a beam. It is based on comparing the period of two different self-images produced by a single diffraction grating. In thi[...]texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | European Optical Soc | 2011We analyze the effect of the fill factor of binary diffraction gratings on the near field propagation. We show that the location of the best-visibility planes changes with the configuration parameters of the grating, that is, the amplitude and p[...]texto impreso
Kriging is a family of linear methods for the estimation of physical quantities with spatial dependence which are optimal in the squared minima sense. To perform the interpolation, kriging considers, in addition to the value and location of the [...]texto impreso
García Botella, Ángel ; Álvarez Fernández Balbuena, Antonio ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2006-10-10Nonimaging optics is a field devoted to the design of optical components for applications such as solar concentration or illumination. In this field, many different techniques have been used to produce optical devices, including the use of refle[...]texto impreso
Quiroga Mellado, Juan Antonio ; Martínez Antón, Juan Carlos ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio ; Álvaro Labajo, M. ; Cortés Testillano, V. | The Optical Society Of America | 2001-06-01We have extended the use of shadow Moiré technique to be implemented in simple curved surfaces by using a flexible grating. Dynamic visual inspection of surface micro-damages is significantly favored by the use of well adapted pliable gratings c[...]texto impreso
Usually, the calibration process for three-dimensional microscopy involves the use of a reference flat surface. The random fluctuations of the topographic image for this reference surface are used for determining the uncertainty of the microscop[...]texto impreso
Rueda Ordax, Gloria María ; Alda, Javier ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2010This paper shows how corneal topographic data can be used to determine the value of the longitudinal spherical aberration. We have obtained the corneal profiles and the values of the longitudinal spherical aberration for the rays propagating wit[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-03-01The term generalized grating imaging is used to describe the process of image formation of a grating using only another grating as imaging system. The moiré and the Lau effects could be regarded as particular cases of such a process. Here we dea[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2008-04In this work, we analyze the far-field pattern produced by a grating made of strips with two different random roughness levels. The efficiency and shape of the diffraction orders is obtained, which are shown to depend on the statistical properti[...]texto impreso
Quiroga Mellado, Juan Antonio ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | IOP Publishing Ltd. | 1995-02A method to estimate in a fast and simple way the response of an image acquiring system (such as a charge-coupled device camera plus an image-processing board) for a monochromatic light source is presented. Two images, whose irradiances are rela[...]texto impreso
Jofre, Marc ; Gardelein, Arnaud ; Anzolin, Gabriele ; Amaya, Waldimar ; Capmany Francoy, José ; Ursin, Rupert ; Peñate Quesada, Laura ; López Molina, Demetrio ; San Juan, J. L. ; Carrasco, José Antonio ; García de Quirós, Francisco ; Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio ; Perdigues Armengol, Josep Maria ; Jennewein, Thomas ; Pérez Torres, Juan ; Mitchell, Morgan W. ; Pruneri, Valerio | The Optical Society Of America | 2011-02-28A novel integrated optical source capable of emitting faint pulses with different polarization states and with different intensity levels at 100 MHz has been developed. The source relies on a single laser diode followed by four semiconductor opt[...]texto impreso
Esteban Martínez, Óscar ; Navarrete Fernández, María Cruz ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | SPIE--The International Society for Optical Engineering | 2000The degree of salinity of water is measured by determining its refractive index with a fiber-optics sensor. The physical principle of the device is the attenuation of the optical power guided by the fibre by the resonant coupling with surface pl[...]texto impreso
Navarrete Fernández, María Cruz ; Bernabeu Martínez, Eusebio | Wissenschaftliche Verlag GMBH | 1995-09Two fiber-optic gyro configuration (interferometric and resonator fiber-optic gyro) are considered and their, response functions are derived by means of graph theory. These response functions are compared with previous results.texto impreso
This paper presents a fibre-optic sensor to measure weight in motion based on a multiple fibre-optic interferometer. The differential phase between the arms of the interferometer produced by the pressure is compensated by a feedback system, thus[...]texto impreso
Quiroga Mellado, Juan Antonio ; Crespo Vázquez, Daniel ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 1999-06In this work, a Fourier transform technique for automatic analysis of moire deflectograms is presented. A squared grating is used to multiplex the information of the deflection in two orthogonal directions in one image. This procedure avoids the[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Optical Society of America | 2000-07It is a well-known fact that one grating can act as an imaging element for another grating when the first is illuminated with an extended monochromatic light source. The conditions for image formation in such a system are studied when the finite[...]texto impreso
Saez Landete, José ; Salcedo Sanz, Sancho ; Rosa Zurera, Manuel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | IEEE (Institute of Electrical and Electronics Engineers) | 2007-07In grating measurement systems, a reference signal is needed to achieve an absolute measurement of the position. The zero reference signals are normally obtained illuminating two identical superimposed zero reference codes (ZRCs) and registering[...]texto impreso
Bernabeu Martínez, Eusebio ; Navarrete Fernández, María Cruz | Wissenschaftliche Verlag GMBH | 1994-09The study of an optical network can be simplified with the help of signal flow graph theory. In this work a brief overview of this theory, and its application to some simple optical networks is given. The graph theory is particularly useful in t[...]texto impreso
García Rodriguez, Lucas ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2004-05-31The pseudo-imaging process in a system consisting of two periodic gratings and illuminated by an incoherent polychromatic and finite extension source placed at a finite distance from the gratings is studied. An analytical expression of the irrad[...]texto impreso
Vázquez Moliní, Daniel ; Álvarez Fernández-Balbuena, Antonio ; García Fernández, Berta ; Bernabeu Martínez, Eusebio | SPIE--The International Society for Optical Engineering | 2008Transmission of light through a 90 degrees elbow in a hollow light guide is an important step in the development of natural lighting applications. In this paper we present a new design that has more than 260% higher efficiency in flux transfer t[...]texto impreso
Vázquez Moliní, Daniel ; González Montes, Mario ; Álvarez Fernández-Balbuena, Antonio ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 2010-12We describe an analytical and numerical method to design and optimize LED (light-emitting diode) collimators. The optimization process is confirmed by optical simulations and experimental measurements of a scaled prototype. The collimator's defi[...]texto impreso
Stretched poly(ethylene-terephthalate) films appear to be an interesting optical plastic for use in polarization control devices. By means of stretching ratios its birefringence, in practice, can be tailored from ?0 to ?0.17. It has a very wide [...]texto impreso
Quiroga Mellado, Juan Antonio ; Sánchez Brea, Luis Miguel ; García Botella, Ángel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2000-08-10A histogram-based technique for robust contrast measurement is proposed. The method is based on fitting the histogram of the measured image to the histogram of a model function, and it can be used for contrast determination in fringe patterns. S[...]texto impreso
García Botella, Ángel ; Álvarez Fernández-Balbuena, Antonio ; Vázquez Moliní, Daniel ; Bernabeu Martínez, Eusebio ; González Cano, Agustín | The Optical Society Of America | 2009-02-01We present a family of three-dimensional concentrators constructed from the photic field generated by a Lambertian emitter. The profile of these concentrators is obtained from the field lines for a two-dimensional truncated wedge and is based on[...]texto impreso
García Botella, Ángel ; Álvarez Fernández Balbuena, Antonio ; Vázquez Moliní, Daniel ; Bernabeu Martínez, Eusebio | Pergamon-Elsevier Science, Ltd. | 2009Nonimaging optics is a field devoted to the design of optical components for applications such as solar concentration or illumination. In this field, many different techniques have been used for producing reflective and refractive optical device[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1995-04-10We present an application of linear-programming techniques to generate metameric spectral radiant power distributions. Conditions concerning physical color properties, dominant wavelength, and excitation purity lead us to propose criteria that p[...]texto impreso
Quiroga Mellado, Juan Antonio ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1998-09-10An improved moiré deflectometry phase-shifting technique is presented. A squared grating is used to multiplex the information of the deflections in two orthogonal directions in one image. This procedure avoids the need to rotate the gratings to [...]texto impreso
Álvarez Fernández-Balbuena, Antonio ; Vázquez Moliní, Daniel ; Alda, Javier ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 2006-07The flux transfer efficiency of an optical array with spatial integration has been improved by adding a new element at the input surface. The optical characteristics of the input surfaces of the individual units do not affect the spatial integra[...]texto impreso
Quiroga Mellado, Juan Antonio ; González Moreno, Ricardo ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | VDI-VDE - Verlag GMBH | 2004CCD-based setups are widely extended in commercial beam profilers. In many beam-profiling applications the high sensitivity of CCD-camera makes necessary the attenuation of the beam. It can affect the beam profile and cause lost of information i[...]texto impreso
Martínez Antón, Juan Carlos ; Siegmann, Philip ; Sánchez Brea, Luis Miguel ; Gómez Pedrero, José Antonio ; Canabal Boutureira, Héctor ; Bernabeu Martínez, Eusebio | The International Society for Optical Engineering (SPIE) | 2001We have developed a prototype for in-line detection of surface defects in metallic wires, specially for scratches. A simple geometrical relationship between surface topography and conical reflection, permits to correlate the defects with intensi[...]texto impreso
Sánchez Brea, Luis Miguel ; Saez Landete, José ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2008-04-01The Talbot effect is a well studied phenomenon by which grating pseudoimages appear at certain periodic distances when monochromatic light is used. Recently, numerical simulations have shown a new phenomenon; when a polychromatic light beam is u[...]texto impreso
Canabal Boutureira, Héctor ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 2001-11A deflectometric method for the characterization of optical systems is presented. It is based on the use of a CCD camera and a subpixel resolution algorithm for the measurement of the deflection of a laser beam that propagates through the system[...]texto impreso
Quiroga Mellado, Juan Antonio ; González Moreno, Ricardo ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Spie-Soc Photo-Optical Instrumentation Engineers | 2005-02A method to enlarge the dynamic range of a CCD-based laser beam profiler is presented. The method is based on extended-image-range techniques. The algorithm that generates the extended-irradiance-range image is described in detail. An equivalent[...]texto impreso
López Alonso, José Manuel ; Vázquez Moliní, Daniel ; Bernabeu Martínez, Eusebio | SPIE--The International Society for Optical Engineering | 2005The use of Light Emitting Diodes (LED) offers a multitude of advantages over conventional illuminating displays in various fields (traffic, publicity, screens for public events and so on). Each pixel of these displays is normally formed by a col[...]texto impreso
García Fernández, Berta ; Vázquez Moliní, Daniel ; Álvarez Fernández Balbuena, Antonio ; Bernabeu Martínez, Eusebio | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2012Cylindrical prismatic hollow light guides are able to transmit daylight properly into the spaces of a building in which natural light has a difficult access. Transmission through the guide depends on the optical characteristics of the material, [...]texto impreso
Gómez Pedrero, José Antonio ; Peñaranda, José Antonio ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1998-04-01A lineal illuminating system based on an optical fiber array is studied. It can be applied to automatic industrial inspection systems, e.g., those used for chromatic classification of ceramic floor tiles. Improvement in the existing system’s per[...]texto impreso
Vázquez Moliní, Daniel ; Álvarez Fernández-Balbuena, Antonio ; Alda Serrano, Francisco Javier ; Bernabeu Martínez, Eusebio | Elsevier Science Ltd. | 2007-12The use of louvers attached to variable information display needs to be optimized taking into account different intrinsic and extrinsic parameters. The analysis of the performance of the display–louvers system takes into account the location, or[...]texto impreso
Esteban Martínez, Óscar ; Navarrete Fernández, María Cruz ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1999-09-01A fiber-optic sensor based on surface-plasmon resonance for the determination of the refractive index is used for measuring the degree of salinity of water. The transducing element consists of a multilayer structure deposited on a side-polished [...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | Sociedad Española de Óptica | 1999In this work we propose a systematic procedure in order to integrate an arbitrary function over any chromaticity diagram similar to that associated with the CIE 1931 standard observer. The precision of this method os checked when smooth function[...]texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | IEEE - Inst. Electrical Electronics Engineers Inc. | 2011-03-15Micro-optical devices embedded in transparent materials are usually manufactured focusing a pulsed laser in bulk fused silica. Under this condition, pulsewidth becomes the most important parameter that rules the size of the inscriptions. Ultrafa[...]texto impreso
The dynamics of thermoplastic-photoconductor films is reviewed. A theory of thermoplastic film deformation is presented for a three-layer structure in air with modified boundary conditions. The amplitude of the deformation A versus the spatial f[...]texto impreso
Esteban Martínez, Óscar ; Navarrete Fernández, María Cruz ; Díaz Herrera, Natalia ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | International Society Offshore & Polar Engineers | 2004A new type of multiparametric optical sensor system for in-situ measurements in seawater was tested under real conditions. Central to the system is an underwater core instrument (CI) which contains light sources and a multichannel spectrometer w[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | IOP Publishing | 2015We analyze the field produced by a cylindrical convex diffraction grating at the Fresnel regime for several kinds of light sources, including a monochromatic quasipunctual source, finite size, and polychromatic sources. These results can help on[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 2013We obtain a general analytical formulation for determining the near field produced by N diffraction gratings disposed in stack using a scalar approximation. Parameters of the gratings such as type-amplitude/phase-, fill factors, periods and rela[...]texto impreso
Herrera Fernández, José María ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2013-06-15Diffractive optical elements (DOEs) are commonly used for beam shaping in the far field. In the present work, we develop an algorithm for near-field beam shaping using a double DOE system with binary modulation, so that it can be easily implemen[...]texto impreso
Ramos Zapata, Gonzalo ; Belenguer Dávila, Tomás ; Monte Muñoz de la Peña, Francisco de ; Levy, David ; Bernabeu Martínez, Eusebio | Amer Chemical Soc | 2003-01-09In this work, we describe the preparation of a novel photoconductive sol?gel material based on an organic/inorganic interpenetrating network (IPN). The composition of the sol?gel photoconductive material mimics the well-known polymeric one based[...]texto impreso
Martínez Antón, Juan Carlos ; Serroukh, Ibrahim ; Bernabeu Martínez, Eusebio | Bureau International des Poids et Mesures (BIPM) | 2001Laser diffraction is a robust and precise technique for measuring wire diameters. However, classical Fraunhofer diffraction formulas are inappropriate for determining the size of three-dimensional objects. Babinet's principle (from classical dif[...]texto impreso
Zoido Chamorro, Jesús Manuel ; Carreño Sánchez, Fernando ; Bernabeu Martínez, Eusebio | Sociedad Española de Óptica | 1996A systematic analysis of the results obtained by MacAdam is presented. We repeat the calculations with the aid of a computer using the data supplied in his paper and the same equations. Significative differences emerge between the results obtain[...]texto impreso
In this work, we have derived a depolarization metric, named Q(M) here, from the nine bilinear constraints between the 16 Mueller-Jones matrix elements, reported previously by several authors following different approaches. This metric Q(M) is s[...]texto impreso
Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | IS&T- The Society for Imaging Science and Technology | 2002-04When estimating the standard deviation of a magnitude with spatial dependence, it is necessary to carry out several measurements at every location where the magnitude is estimated. However, in image applications the standard deviation is commonl[...]texto impreso
This letter analyzes the quality of reproduction of holograms recorded in thermoplastic media as a function of the variations in coating thickness of the different layers. The fidelity of reproduction is investigated by means of a phase sampling[...]texto impreso
Alonso Fernández, José ; Crespo Vázquez, Daniel ; Jiménez Castillo, Isidoro ; Bernabeu Martínez, Eusebio | SPIE--The International Society for Optical Engineering | 2005An all optical autofocus has been designed and tested for tight line width control in a high NA laser photoplotter system. The laser system is based in a GaN semiconductor laser with power 30 mW and wavelength 405 nm. The advantage of using this[...]texto impreso
Carreño Sánchez, Fernando ; Martínez Antón, Juan Carlos ; Bernabeu Martínez, Eusebio | American Institute of Physics | 1994-08Optical interference fringe measurements of the thickness of weakly absorbing media can be rapid, accurate, and nondestructive. When the refractive index n of the sample is known, it will give us the layer thickness d. If, however, n is unknown,[...]texto impreso
Rueda Ordax, Gloria María ; Alda, Javier ; Bernabeu Martínez, Eusebio | Gustav Fischer Verlag | 1999The maximum or minimum character of the optical path is analyzed when the angle of incidence on a dielectric sphere is near the limit angle and the object point is close to the Weierstrass object point.texto impreso
González Díaz, Germán ; Bernabeu Martínez, Eusebio ; Hernández Rojas, J. L. ; Escudero, J. L. ; Guerrero, H. | American Institute of Physics | 1993-09-01Bulk polycrystalline cadmium manganese telluride, Cd(l-x)Mn(x)Te, was manufactured in several compositions by a synthesis process. The structure of the obtained compounds was the characteristic zinc-blende polycrystalline pattern being the grain[...]texto impreso
Sánchez Brea, Luis Miguel ; Siegmann, Philip ; Rebollo, María Aurora ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2000-02-01In industrial applications of thin metallic wires it is important to characterize the surface defects of the wires. We present an optical technique for the automatic detection of surface defects on thin metallic wires (diameters, 50–2000 µm) tha[...]texto impreso
Vilas Prieto, José Luis ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2013-03-20Two plates of different birefringence material can be combined to obtain an achromatic wave retarder. In this work, we achieve a correction for the overall retardation of the system that extends the relation to any azimuth. Current techniques fo[...]texto impreso
VilasPrieto, José Luis ; Sánchez Brea, Luis Miguel ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2013-10-13This reply attempts to cast some more light on the achromatic systems composed by wave plates, in particular to the calculus of the overall retardation and the use of the Jones matrix equivalence theorem. An equivalent expression for the overall[...]texto impreso
Saez Landete, José ; Salcedo Sanz, Sancho ; Rosa Zurera, Manuel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2005-10-15A new technique for the generation of optical reference signals with optimal properties is presented. In grating measurement systems a reference signal is needed to achieve an absolute measurement of the position. The optical signal is the autoc[...]texto impreso
Morlanes Calvo, Tomás ; Peña, José Luis de la ; Sánchez Brea, Luis Miguel ; Alonso Fernández, José ; Crespo Vázquez, Daniel ; Saez Landete, José ; Bernabeu Martínez, Eusebio | Society of Photo-Optical Instrumentation Engineers (SPIE) | 2005In this work, an optoelectronic device that provides the absolute position of a measurement element with respect to a pattern scale upon switch-on is presented. That means that there is not a need to perform any kind of transversal displacement [...]texto impreso
Quiroga Mellado, Juan Antonio ; González Cano, Agustín ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1995-05-10A new algorithm for phase unwrapping of phase maps with noise or logical inconsistencies is proposed. It is based on the use of an adaptive threshold and the second difference of the locally unwrapped phase as a selection criterion for the pixel[...]texto impreso
Quiroga Mellado, Juan Antonio ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1994-10-10Automated fringe-pattern processing is important in a great number of industrial applications, such as optical data testing and quality control. One of the main problems that arises with these processes is the automated phase unwrapping of the p[...]texto impreso
Vázquez Moliní, Daniel ; Alda, Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 1999-03-01A planar optical array is presented that provides a selective concentration of the light incident upon the system onto a given area. Several alternative designs are analyzed and explained geometrically. The photometric calculation is presented f[...]texto impreso
Bernabeu Martínez, Eusebio ; Salgado Remacha, Francisco Javier ; Sánchez Martín, José Antonio | Elsevier Sci. Ltd. | 2014-04We present in this work a study of the diffraction of a focused Gaussian beam by a microrefractive cylinder, and the dependence of the far field diffracted pattern with the location of the beam focal plane, relative to the center of the cylinder[...]texto impreso
texto impreso
López Alonso, José Manuel ; Alda, Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2002-01-10Principal-component decomposition is applied to the analysis of noise for infrared images. It provides a set of eigenimages, the principal components, that represents spatial patterns associated with different types of noise. We provide a method[...]texto impreso
Mejías Arias, Pedro Miguel ; Martínez Herrero, Rosario ; Bernabeu Martínez, Eusebio | American Physical Society | 1986-03A novel type of optical bistable configuration, namely the so-called double-ring (DR) device, is presented. The stationary solutions in the purely absorptive case for a homogeneously broadened atomic system are derived. In the mean-field limit i[...]texto impreso
Espinosa Luna, Rafael ; Atondo Rubio, Gelacio ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2008-04-01A depolarization scalar metric for Mueller matrices, named Q(M) , is derived from the degree of polarization. Q(M) has been recently reported, and it has been deduced from the nine bilinear constraints between the sixteen elements of the Mueller[...]texto impreso
Sánchez Brea, Luis Miguel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2004-06-01When a polychromatic light illuminates a grating, an achromatic and continuous self-imaging regime is produced, what means that Talbot planes are eliminated. In this work, we investigate the existence of this continuous regime for generalized gr[...]texto impreso
Crespo Vázquez, Daniel ; Alonso Fernández, José ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2000-08-01Reflection optical encoders are studied as three-grating moiré systems. An analysis is made of the differences that may appear between it and the standard case in which an optical encoder is regarded as a two-grating system.texto impreso
Salgado Remacha, Francisco Javier ; Sánchez Brea, Luis Miguel ; Álvarez Ríos, Francisco Javier ; Bernabeu Martínez, Eusebio | The Optical Society Of America | 2010-04-01We analyze the focusing properties of Fresnel zone plates fabricated over steel tapes using laser ablation. Our intention is to implement the use of micro-optical elements when the use of conventional chrome–glass elements is not indicated. Beca[...]texto impreso
Sánchez Brea, Luis Miguel ; Torcal Milla, Francisco José ; Herrera Fernández, José María ; Morlanes, Tomás ; Bernabeu Martínez, Eusebio | Optical Society of America | 2014A simple collimation technique based on measuring the period of one self-image produced by a diffraction grating is proposed. Transversal displacement of the grating is not required, and then automatic single-frame processing can be performed. T[...]texto impreso
Torcal Milla, Francisco José ; Sánchez Brea, Luis Miguel ; Salgado Remacha, Francisco Javier ; Bernabeu Martínez, Eusebio | Elsevier Science BV | 2010-10-15We analyze the near field behavior of binary amplitude gratings which present a curved profile. This configuration has an important application in rotary optical encoders. This kind of encoders is used to measure the angular displacement between[...]