FRD - CENES: Materiales subidos recientemente
Mostrando ítems 61-80 de 110
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Spectral sensor resolution measurement improvements by temporal analysis
(IEEE Xplore, 2017-12-18)In this work we present time domain interferometry (TDI) and spectral domain interferometry (SDI) techniques applied to a fiber optic Fizeau interferometer sensor. This class of sensor is capable of measuring parameters ... -
Extending low-coherence interferometry dynamic range using heterodyne detection
(2020-08)Low-coherence interferometry (LCI) technique is generating considerable interest in industrial applications where there is a need for larger measurements with high resolution. Conventional Fourier domain systems reach a ... -
Dual system increases the resolution of a low coherence interferometer system through a signal detector astigmatic focus
(2015-10-29)La interferometría de baja coherencia en el espacio de Fourier (OCT-FD) es una técnica que permite medir distancia con valores típicos de rango dinámico en el orden de 3 mm y resolución por debajo de los 10 µm. En este ... -
Dynamic Detection of Thicknesses in Polymer Deformation Based on the Optical Coherence Interferometry Technique
(2015-07-31)We describe the implementation of the optical coherence interferometry (OCT) technique in the dynamic measurement of the deformation of polymers. The experimental set-up of the interferometer system and the signal processing ... -
Characterization of reference standards for dirt by Laser Ablation Induced Photoacoustics (LAIP)
(2009-07-23)Measurements of surface cleanliness and dirt characterization are important problems in a wide range of processes in industry and production. Standard methods are in most cases cumber some laboratory procedures that must ... -
Simple method for thickness measurement in opaque samples with a Michelson-Sagnac interferometer
(2008-04-24)We present in this work a method to measure thicknesses of opaque samples. The technique combines the use of low coherence interferometry with a Michelson-Sagnac configuration. This ring set-up let us to measure both faces ... -
Preliminary study of a heterodyne detection system for optical coherence tomography signals
(2019-10-24)A heterodyne detection system for optical coherence tomography signalsis presented and characterized. The system allows to expand the range of measurement and overcome the limitations of conventional systems which typically ... -
Application of a long-rangesweptsource optical coherence tomography-based scheme for dimensional characterization of multilayer transparent objects
(2017-08-18)This work presents the use of a recently develop edinter ferometric system based on the swept source optical coherence tomography (SS-OCT) technique, which allows the characterization of transparent and semitransparent ... -
Fast scanner with position monitor forlargeopticaldelays
(2001-11-01)Wepresent a new fastscansystemthatemploys a stepper motor used in a single steposcillatingmode and a position monitor devicebasedon a diode laser. Thesetupusedgeneratesdelays as large as 105 ps at 10 Hz, with 100% dutycycle. ... -
Wide band interferometryforthicknessmeasurement
(2003)In thisworkwepresentthe concept of wide band interferometry as opposed to white-light interferometry to introduce a thickness measurementmethodthatgainsprecisionwhenthebandwidthisreduced to anadequatecompromise in order ... -
Transparent glass slab thickness measurement by binary-spot focus signal
(2019-12-12)Focus error systems based on the astigmatic principle relying on four quadrant photo detectors as the signal generation element have widely been used in many different applications. Nevertheless, its working principle ... -
Molecular rotational diusion detected by dierential fluorescence energy
(2000-03-01)In this paper, we present a complete study of the influence of the molecular rotational diffusion movement in the fluorescence signal when a sample is excited by two short pulses. The study includes the calculations of ... -
Evaluation of plastic deformation in steels with magnetic and acoustic techniques
(2020-02-06)Barkhausen Magnetic Noise (MBN) and Magnetic Acoustic Emission (MAE) are phenomena that occur in ferromagnetic materials which undergo changes in their magnetization. These phenomena are very sensitive to changes on ... -
Redes Neuronales aplicadas al monitoreo de procesos de perforación en probetas de material geológico
(2019)Una Red Neuronal Artificial (RNA) es un modelo matemático computacional que intenta imitar, limitadamente, la estructura y funcionamiento de neuronas biológicas las cuales, a grandes rasgos, toman señales eléctricas de ... -
Simultaneous measurement of deformation and thickness change in polymer films
(2006-08-14)We present experimental results in deformation measurement and thickness change in polymer films employing Fourier domain interferometry. The set-up is a Michelson configuration in which interference signal betweeen light ... -
Dimensional characterization of large opaque samples and microdeformations by low coherence interferometry
(2020-01-25)We report on the application of an interferometric system based on the low-coherence interferometry technique to the dimensional characterization of large opaque mechanical parts as well as microdeformations experienced ... -
Topografía de superficies obtenida por interferometría de baja coherencia de alta resolución espacial
(2016)La tomografía óptica coherente (OCT por sus siglas en inglés) es una técnica óptica no destructiva, que utiliza una fuente de luz de gran ancho espectral que se enfoca sobre un punto de la muestra para determinar la distancia ... -
Microscopía óptica coherente por interferometría de baja coherencia de una sola rama aplicada a la caracterización de topografía de superficies
(2016)En este trabajo se presenta la técnica de microscopia óptica coherente basada en la interferometría de baja coherencia en el dominio de las frecuencias (FD-OCM por sus siglas en ingles) en un esquema experimental que propone ... -
Interferometría óptica de baja coherencia para caracterización dimensional de microestructuras
(2016)En este trabajo se presenta un sistema de laboratorio basado en la técnica de interferometría óptica de baja coherencia en el dominio de las frecuencias (FD-OCT) para la caracterización dimensional de microestructuras. El ... -
Desarrollo de un equipo basado en un interferómetro de baja coherencia para medición de topografía y tomografía de materiales
(2017)Este trabajo presenta los resultados de un proyecto del desarrollo de un equipo para realizar topografías y tomografías de materiales basado en una técnica óptica aplicado como ensayo no destructivo para la caracterización ...