Recursos de colección

Archivo Digital UPM (122.777 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Optica

Mostrando recursos 1 - 13 de 13

  1. A review of the promises and challenges of micro-concentrator photovoltaics

    Domínguez Domínguez, César; Jost, Norman; Askins, Stephen; Victoria Pérez, Marta; Anton Hernandez, Ignacio
    Micro concentrator photovoltaics (micro-CPV) is an unconventional approach for developing high-efficiency low-cost PV systems. The micrifying of cells and optics brings about an increase of efficiency with respect to classical CPV, at the expense of some fundamental challenges at mass production. The large costs linked to miniaturization under conventional serial-assembly processes raise the need for the development of parallel manufacturing technologies. In return, the tiny sizes involved allows exploring unconventional optical architectures or revisiting conventional concepts that were typically discarded because of large material consumption or high bulk absorption at classical CPV sizes.

  2. Experimental analysis and simulation of a production line for CPV modules: impact of defects, misalignments, and binning of receivers

    Herrero Martin, Rebeca; Anton Hernandez, Ignacio; Victoria Pérez, Marta; Domínguez Domínguez, César; Askins, Stephen; Sala Pano, Gabriel; De Nardis, Davide; Araki, Kenji
    An inherent characteristic of high concentrator photovoltaics (HCPV) modules is a tight mechanical tolerance caused by the narrow angular transmission of the optical system, typically below or close to 1°. Misalignments in the modules caused during the assembly process in the production line will degrade not only the electrical but also the angular performance of the module. Moreover, dispersion in the electrical characteristics of the elementary units comprising a module would lead also to power loss. Quality control and data analysis on the production line is of great significance for adjusting the production line and preserving the angular tolerance and...

  3. An end of service life assessment of PMMA lenses from veteran concentrator photovoltaic systems

    Miller, David C.; Khonkar, Hussameldin I.; Herrero Martin, Rebeca; Anton Hernandez, Ignacio; Johnson, David K.; Hornung, Thorsten; Schmid-Schirling, Tobias; Vinzant, Todd B.; Deutch, Steve; To, Bobby; Sala Pano, Gabriel; Kurtz, Sarah R.
    The optical performance of poly(methyl methacrylate) lenses from veteran concentrator photovoltaic modules was examined after the end of their service life. Lenses from the Martin-Marietta and Intersol module designs were examined from the “Solar Village” site near Riyadh, Saudi Arabia, as well as the Phoenix Sky Harbor airport, followed by the Arizona Public Service Solar Test and Research (APS-STaR) center in Tempe, Arizona. The various lens specimens were deployed for 20, 27, and 22 years, respectively. Optical characterizations included lens efficiency (Solar Simulator instrument), material transmittance and haze (of coupons cut from veteran lenses, then measured again after their faceted...

  4. Caracterización de la reflectancia bidireccional 0º:45º de un material de reflectancia difusa

    Coronado Pons, Mar
    El presente proyecto se ha llevado a cabo en el Instituto de Óptica del CSIC (Consejo Superior de Investigaciones Científicas). Se trata de un trabajo esencialmente experimental cuyo objetivo es la caracterización absoluta de un material de reflectancia difusa a la geometría 0°: 45° , en el intervalo espectral del visible. Para ello se valida y mejora una metodología y se comprueba su compatibilidad con los patrones disponibles actualmente en el Instituto de Óptica del CSIC. Se aplica este procedimiento sobre una material de reflectancia difusa, una muestra cerámica (AP03 según la catalogación interna del CSIC). Este material ha de ser lo suficientemente estable como para mantenerse...

  5. Characterization of optical pulses generated by Gain Switching a 1310 nm VCSEL

    Rosado, Alejandro; Vilera Suárez, Mariafernanda; Pérez-Serrano, Antonio; García Tijero, Jose Manuel; Esquivias Moscardo, Ignacio
    We present the characterization of the optical response of a commercially available 1310 nm VCSEL under gain-switching operation. We demonstrate short pulse generation with pulse widths of 45 ps at 2 GHz repetition rate. The experimental results are compared with simulations based on a rate equation model for single-mode semiconductor lasers. A good agreement is found after a sensible estimation of the simulation parameters.

  6. Modifying light propagation in planar waveguides with cladding liquid crystals

    Gil Valverde, Manuel; Caño Garcia, Manuel; Otón Martínez, Eva; Geday, Morten Andreas; Quintana Arregui, Patxi Xabier; Oton Sanchez, Jose Manuel
    Liquid crystal devices are increasingly being used in non-display applications to manufacture small devices that can be driven by low voltage electronics. LCs are low cost, light weight and avoid using mechanical components. A wide number of interesting applications involve the use of LCs for phase modulation of light. This can be done with light propagating through the LC itself or rather with light propagating in a waveguide (WG) where sections of its cladding are filled with LC that interacts with the light?s evanescent field. Several device families based on this general outline are being tested in our group. The...

  7. Light coupling in microscale polymer photonic circuits

    Gil Valverde, Manuel; Caño García, Manuel; Poudereux Sánchez, David; Geday, Morten Andreas; Otón Sánchez, José Manuel; Quintana Arregui, Patxi Xabier
    Photonic integrated circuits (PICs) are devices that integrate multiple photonic functions. The visible light is guided between components by light waveguides of the same order as light wavelength, i.e. 1-5?m or even less [1]. Because of the size of connections, coupling light into PICs is a challenging task previous to characterizing them. The aim of our group is to turn a passive PIC into an active one by adding layers of electro-optics materials, either as a component within the light path, or deposited onto the waveguide affecting the evanescent field of the guided light. Testing the light behavior inside the...

  8. Polymer selective laser curing for integrated optical switches

    Gil Valverde, Manuel; Caño Garcia, Manuel; Delgado, Rodrigo; Zuo, Tianyi; Otón Sánchez, José Manuel; Quintana Arregui, Patxi Xabier; Geday, Morten Andreas
    A simple in-layer electro optical switch has been prepared by selectively curing a photocurable optical polymer with a UV laser. The core of the device is a NOA-81 multimode waveguide grown by selective laser curing. The cladding is a positive calamitic liquid crystal, which allows tunability and switching of the waveguide by external driving electric signals. The effective refractive index in the guide changes upon switching the liquid crystal. Depending on the geometry, this setup leads to an electrooptical modulator or a switch between two levels of transmitted light

  9. Feasibility of tracking laparoscopic instruments in a box trainer using a Leap Motion Controller

    Oropesa García, Ignacio; Jong, Tom de; Sanchez Gonzalez, Patricia; Dankelman, J.; Gómez Aguilera, Enrique J.
    Motion analysis is employed to assess minimally invasive surgical psychomotor skills in box trainers. Tracking of laparoscopic instruments requires sensor-based systems that can be expensive, limit movements and modify their ergonomic properties. We evaluate the feasibility of using Leap Motion as a cheap, unobtrusive alternative. Four experiments were performed to determine its precision while tracking a laparoscopic instrument inside and outside a box trainer. Static long and short term precision of the Leap Motion was <2.5 mm. Precision between 12 different positions within the box trainer was <0.7 mm for all measured distances between neighbors. Dynamic precision when moving the...

  10. Stopping of α particles from the core in corona plasmas

    Mima, Kunioki; Tajima, Toshiki; Alvarez Ruiz, Jesus; Tanaka, K.A.; Perlado Martín, José Manuel; Nagatomo, H.; Johzaki, T.; Sunahara, A.
    In the laser fusion reactor design, the protection of first wall and the final optics from high energy ions is the key issue. So, it is necessary to predict the precise energy spectra of ions.In the previous reactor designs, the ion energy spectra were provided by the classical ion transport codes. However, this poster shows that the α particle spectrum is significantly modified by the anomalous process in ablated plasmas.

  11. Uncertainty in ellipse fitting using a flatbed scanner: development and experimental verification

    Vicente Oliva, Jesús de; Sanchez Perez, Angel M.; Berzal Rubio, Miguel; Maresca, Piera; Gomez Garcia, Emilio
    In the field of dimensional metrology, the use of optical measuring machines requires the handling of a large number of measurement points, or scanning points, taken from the image of the measurand. The presence of correlation between these measurement points has a significant influence on the uncertainty of the result. The aim of this work is the development of an estimation procedure for the uncertainty of measurement in a geometrically elliptical shape, taking into account the correlation between the scanning points. These points are obtained from an image produced using a commercial flat bed scanner. The characteristic parameters of the...

  12. Diseño de una red de fibra óptica para la implementación de servicios de una banda ancha en una zona de viviendas en casco urbano

    Barroso García, Andrés
    El objetivo del proyecto es el diseño y la instalación de una red de fibra óptica para la implementación de servicios de banda ancha en una zona de viviendas. Mediante esta instalación se dará servicio de fibra óptica hasta el hogar (FTTH). El proyecto cubre la instalación desde la Central de Comunicación hasta los usuarios.

  13. Super-resolution properties of the Spherical Geodesic Waveguides using the perfect drain

    Gonzalez Lopez, Juan Carlos; Grabovičkić, Dejan; Miñano Dominguez, Juan Carlos; Benitez Gimenez, Pablo
    Perfect drain for the Maxwell Fish Eye (MFE) is a nonmagnetic dissipative region placed in the focal point to absorb all the incident radiation without reflection or scattering. The perfect drain was recently designed as a material with complex permittivity ? that depends on frequency. However, this material is only a theoretical material, so it can not be used in practical devices. Recently, the perfect drain has been claimed as necessary to achieve super-resolution [Leonhard 2009, New J. Phys. 11 093040], which has increased the interest for practical perfect drains suitable for manufacturing. Here, we analyze the superresolution properties of...

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