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Quiroga Mellado, Juan Antonio ; Vargas, Javier ; González Fernández, Luis M. ; Belenguer Dávila, Tomás | Optical Society of America | 2010-06-01We demonstrate a method to calibrate a Shack-Hartmann sensor as an orthographic camera. This calibration method permits us to obtain the distance, the rotation matrix between the microlens array and CCD imaging planes, and the projection matrix,[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Belenguer Dávila, Tomás | 2010-11-01We demonstrate a method to directly demodulate closed-fringe interferograms using a kind of active contour called a snake. This method can be used to demodulate a single closed-fringe interferogram when its background illumination and/or contras[...]texto impreso
Ramos Zapata, Gonzalo ; Belenguer Dávila, Tomás ; Balado, Ana ; Encinas, José M. ; Armendáriz, Iñaki ; Carretero, Ángel ; Arza, César ; Alcacera, María A. ; Fernández, José A. ; Muñóz, Elisa ; Tinetti, Giovanna ; Eccleston, Paul ; Swinyard, Bruce ; Middleton, Kevin ; Bryson, Ian ; Zapatero, Mª Rosa | SPIE | 2014-08-28EChO (Exoplanet atmospheres Characterization Observatory), a proposal for exoplanets exploration space mission, is considered the next step for planetary atmospheres characterization. It would be a dedicated observatory to uncover a large select[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Restrepo, R. ; Belenguer Dávila, Tomás | Elsevier Science B. V. | 2011-08-15We demonstrate a method to easily and quickly extend the dynamic range imaging capabilities of the camera in a typical interferometric approach. The camera dynamic range is usually low and limited to 256 gray levels. Also, it is well known that [...]texto impreso
González Fernández, Luis M. ; Pastor Sempere, Carmen ; Belenguer Dávila, Tomás ; Arrazola, David ; Fernández, Marianela ; González, Concha | 2016Space optics is present in almost all instruments embarked in spatial missions. Among others large-aperture long-focal length optical systems, spectrometers and visible/IR cameras are common instruments. Operation in the hostile spatial environm[...]texto impreso
This paper explains two iterative phase recovery methods where the goal of each one is different. The Phase Diversity method is used to recover the wavefront aberrations in optical incoherent imaging systems when an extended object is illuminate[...]texto impreso
Zuloaga-Ramirez, Pablo ; Frövel, Malte ; Belenguer Dávila, Tomás ; Salazar, Felix | Elsevier | 2015-03This work presents the evaluation of a new non-contact technique to assess the fatigue damage state of CFRP structures by measuring surface roughness parameters. Surface roughness and stiffness degradation have been measured in CFRP coupons cycl[...]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
Quiroga Mellado, Juan Antonio ; Uribe Patarroyo, Néstor R. ; Vargas, Javier ; Álvarez Herrero, Alberto ; Belenguer Dávila, Tomás | The Optical Society Of America | 2010-02-01Liquid crystal variable retarders (LCVRs) are starting to be widely used in optical systems because of their capacity to provide a controlled variable optical retardance between two orthogonal components of incident polarized light or to introdu[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Álvarez Herrero, Alberto ; Belenguer Dávila, Tomás | The Optical Society Of America | 2011-01-17The presence of uncontrolled mechanical vibrations is typically the main precision-limiting factor of a phase-shifting interferometer. We present a method that instead of trying to insolate vibrations; it takes advantage of their presence to pro[...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; Belenguer Dávila, Tomás | The Optical Society Of America | 2011-04-15An asynchronous phase-shifting method based on principal component analysis (PCA) is presented. No restrictions about the background, modulation, and phase shifts are necessary. The presented method is very fast and needs very low computational [...]texto impreso
Pastor Sempere, Carmen ; Jellema, Willem ; Zuluaga Ramírez, Pablo ; Arrazola, David ; Fernández Rodríguez, M. ; Belenguer Dávila, Tomás ; González Fernández, Luis M. ; Audley, Michael D. ; Evers, Jaap ; Eggens, Martin ; Torres Redondo, Josefina ; Najarro, Francisco ; Roelfsema, Peter | SPIE | 2016SpicA FAR infrared Instrument, SAFARI, is one of the instruments planned for the SPICA mission. The SPICA mission is the next great leap forward in space-based far-infrared astronomy and will study the evolution of galaxies, stars and planetary [...]texto impreso
Quiroga Mellado, Juan Antonio ; Vargas, Javier ; González Fernández, Luis M. ; Belenguer Dávila, Tomás | The Optical Society Of America | 2010-05-01In the optical quality measuring process of an optical system, including diamond-turning components, the use of a laser light source can produce an undesirable speckle effect in a Shack-Hartmann (SH) CCD sensor. This speckle noise can deteriorat[...]texto impreso
Vargas, Javier ; Restrepo Gómez, René ; Belenguer Dávila, Tomás | The Optical Society Of America | 2014-01-27We present a robust, dense, and accurate Shack-Hartmann spot dislocation map determination method based on a regularized optical flow algorithm that does not require obtaining the spot centroids. The method is capable to measure in presence of s[...]texto impreso
Cheben, Pavel ; Calvo Padilla, María Luisa ; Belenguer Dávila, Tomás ; Núñez Peral, Armonía | Elsevier Science BV | 1998-03-01A novel method of substrate mode hologram (SMH) design and fabrication is presented. The coupling between a homogeneous plane wave and an arbitrary free propagating wave is achieved via a total internally reflected (TIR) wave. The input slanted [...]
