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Listar por autor "Madrigal Madrigal, Javier"

Mostrando ítems 1-20 de 32

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Assessment of Fiber Bragg Grating Sensors for Monitoring Shaft Vibrations of Hydraulic Turbines

Sánchez-Botello, Xavier; Roig, Rafael; De La Torre, Oscar; Madrigal-Madrigal, Javier; Sales Maicas, Salvador; Escaler, Xavier (MDPI AG, 2023-08)

[EN] The structural dynamic response of hydraulic turbines needs to be continuously monitored to predict incipient failures and avoid catastrophic breakdowns. Current methods based on traditional off-board vibration sensors ...
Characterization of a FBG sensor interrogation system based on a mode-locked laser scheme

Madrigal-Madrigal, Javier; Fraile-Pelaez, Francisco Javier; Zheng, Di; Barrera Vilar, David; Sales Maicas, Salvador (The Optical Society, 2017-10-02)

[EN] This paper is focused on the characterization of a fiber Bragg grating (FBG) sensor interrogation system based on a fiber ring laser with a semiconductor optical amplifier as the gain medium, and an in-loop electro-optical ...
Coupled-core fiber Bragg gratings for low-cost sensing

Flores-Bravo, Jose A.; Madrigal-Madrigal, Javier; Zubia, Joseba; Sales Maicas, Salvador; Villatoro, Joel (Nature Publishing Group, 2022-01-24)

[EN] Sensors based on Bragg gratings inscribed in conventional single mode fibers are expensive due to the need of a sophisticated, but low-speed, interrogation system. As an alternative to overcome this issue, in this ...
Desarrollo de sensores ópticos realizados en fibras multicore para medios acuáticos

Segarra Salas, Patricia (Universitat Politècnica de València, 2020-01-02)

[ES] Este TFG trata sobre la investigación y el desarrollo de sensores basados en FBGs inscritas en fibras de varios núcleos cuya finalidad será estudiar la variación de la curvatura de la fibra en un medio acuático mediante ...
Diseño, fabricación y caracterización de sensores basados en fibras ópticas de múltiples núcleos

Madrigal Madrigal, Javier (Universitat Politècnica de València, 2022-02-14)

[ES] La fibra óptica ha supuesto una gran revolución en el mundo de las telecomunicaciones debido a su alta capacidad de transmisión y sus bajas pérdidas. Hoy en día no sería posible transportar la cantidad de tráfico que ...
Effects of bonding on the performance of optical fiber strain sensors

Floris, Ignazio; Sangiorgio, Valentino; Adam, Jose M; Uva, Giuseppina; Rapido, Monica; Calderón García, Pedro Antonio; Madrigal-Madrigal, Javier (John Wiley & Sons, 2021-09)

[EN] The structural health monitoring (SHM) of existing buildings, structures, and infrastructures has become increasingly important in recent years, while the interest of the scientific community is focused on the use of ...
Estimación del tiempo medio de estancia en comercios mediante análisis de vídeo

Madrigal Madrigal, Javier (Universitat Politècnica de València, 2015-10-29)

El objetivo de este proyecto es obtener el tiempo de estancia de los clientes en los comercios analizando las secuencias de vídeo proporcionadas por una cámara IP cenital. Para estimar dicho tiempo se empleará la ...
Experimental study of the influence of FBG length on optical shape sensor performance

Floris, Ignazio; Madrigal-Madrigal, Javier; Sales Maicas, Salvador; Adam, Jose M; Calderón García, Pedro Antonio (Elsevier, 2020-03)

[EN] This paper compares the performance of optical Multicore Fibres (MCFs) with inscribed Fibre Bragg Gratings (FBGs) used as curvature and shape sensors in relation to strain sensor length. Two fibre optic shape sensors, ...
Fast Incoherent OFDR Interrogation of FBG Arrays Using Sparse Radio Frequency Responses

Clement, J.; Hervás-Peralta, Javier; Madrigal-Madrigal, Javier; Maestre, H; Torregrosa, G.; Fernandez-Pousa, Carlos R.; Sales Maicas, Salvador (Institute of Electrical and Electronics Engineers, 2018-10-01)

[EN] We present two implementations of fast, discrete incoherent optical frequency-domain reflectometers (I-OFDR) for the interrogation of equally spaced fiber Bragg grating (FBG) arrays, based on the determination of the ...
Few-mode fiber true time delay lines for distributed radiofrequency signal processing

Guillem-Cogollos, Rubén; García-Cortijo, Sergi; Madrigal-Madrigal, Javier; Barrera Vilar, David; Gasulla Mestre, Ivana (The Optical Society, 2018)

[EN] We report, for the first time to our knowledge. distributed radiofrequency signal processing built upon true time delay operation on a step-index few-mode fiber. Two 3-sample configurations with different time delay ...
Few-mode fibre delay lines with inscribed long period gratings for radiofrequency signal processing

García-Cortijo, Sergi; Guillem-Cogollos, Rubén; Madrigal-Madrigal, Javier; Barrera Vilar, David; Sales Maicas, Salvador; Gasulla Mestre, Ivana (IEEE, 2019-09-26)

[EN] We propose and experimentally demonstrate distributed radiofrequency signal on a few-mode-fibre device. The inscription of long period gratings at specific locations along the fibre allows the excitation of the ...
High-voltage Sensor Based on Fiber Bragg Grating in Fibers with Electrodes

Pereira, J. M. B.; Sartiano, Demetrio; Hervás, J.; Barrera, D.; Madrigal-Madrigal, Javier; Sales Maicas, Salvador; Laurell, F.; Tarasenko, O.; Margulis, W. (IEEE, 2020-05-15)

[EN] This work describes the use of FBGs inscribed in optical fiber with electrodes for voltage sensing. The results show a quadratic voltage dependence. The device can be explored for a multipoint, single-ended voltage ...
Impact of COVID-19 lockdown in telecommunications engineering competency-based alumni ranking

Llorente, Roberto; Rodríguez-Hernández, Miguel A.; Hernandez Franco, Carlos Alberto; Sastre, Jorge; CARRIÓN GARCÍA, ALICIA; Madrigal-Madrigal, Javier (IATED Academy, 2020-11-10)

[EN] Higher education, as other social and economic sectors in Spain, was disrupted on 15th March 2020 following health emergency Laws enacted related to COVID-19. Non-presential lecturing was stablished country-wide until ...
Long Period Gratings in Multicore Optical Fibers for Directional Curvature Sensor Implementation

Barrera Vilar, David; Madrigal-Madrigal, Javier; Sales Maicas, Salvador (Institute of Electrical and Electronics Engineers, 2018)

[EN] Multicore optical fibers are especially attractive for the fabrication of curvature and shape sensors due to the spatial distribution of the different cores. Fiber Bragg gratings have been used in the past for the ...
Medidas en tiempo real de señales acústicas procedentes de tuberías captadas con FBG

Ruiz Escorihuela, Víctor Javier (Universitat Politècnica de València, 2023-10-05)

[ES] Se ha puesto en marcha un sistema de captación en tiempo real de señales acústicas procedentes de tuberías mediante procedimientos ópticos. Para ello se ha configurado una tarjeta de adquisición de datos, además de ...
Microwave Photonic Filtering for Interrogating FBG-Based Multicore Fiber Curvature Sensor

Zheng, Di; Madrigal-Madrigal, Javier; Barrera Vilar, David; Sales Maicas, Salvador; Capmany Francoy, José (Institute of Electrical and Electronics Engineers, 2017-10-15)

[EN] We propose and experimentally demonstrate an approach to perform high-resolution and temperature-insensitive interrogation of a fiber Bragg grating (FBG)-based multicore fiber (MCF) curvature sensor using a microwave ...
Microwave Photonics Filtering Interrogation Technique Under Coherent Regime For Hot Spot Detection on a Weak FBGs Array

Hervás-Peralta, Javier; Barrera Vilar, David; Madrigal-Madrigal, Javier; Sales Maicas, Salvador (Institute of Electrical and Electronics Engineers, 2018)

[EN] An interrogation technique of cascaded FBG sensors based on a microwave photonics filtering technique under coherent regime is presented. The sensing information of a 5-m fiber coil containing 500 weak FBG with a ...
Multi-Core Optical Fibers With Bragg Gratings as Shape Sensor for Flexible Medical Instruments

Khan, Fouzia; Denasi, Alper; Barrera, David; Madrigal-Madrigal, Javier; Sales Maicas, Salvador; Misra, Sarthak (Institute of Electrical and Electronics Engineers, 2019-07-15)

[EN] This paper presents a technique to reconstruct the shape of a flexible instrument in three-dimensional Euclidean space based on data from fiber Bragg gratings (FBGs) that are inscribed in multi-core fibers. Its main ...
Multicore fiber-Bragg-grating-based directional curvature sensor interrogated by a broadband source with a sinusoidal spectrum

Zheng, Di; Madrigal-Madrigal, Javier; Chen, Hailan; Barrera Vilar, David; Sales Maicas, Salvador (The Optical Society, 2017)

[EN] A simple, spectral-drift-insensitive interrogation scheme for a multicore fiber Bragg grating (FBG)-based directional curvature sensor is proposed. The basic principle is to transform the wavelength shift of FBGs into ...
Multicore optical fiber shape sensors suitable for use under gamma radiation

Barrera, David; Madrigal-Madrigal, Javier; Delepine-Lesoille, Sylvie; Sales Maicas, Salvador (The Optical Society, 2019-09-30)

[EN] We have designed and implemented a fiber optic shape sensor for high-energy ionizing environments based on multicore optical fibers. We inscribed two fiber Bragg gratings arrays in a seven-core optical fiber. One of ...