A5036098288- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Adaptive optics and wavefront sensing
- Spectroscopy and Laser Applications
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Photonic Crystal and Fiber Optics
- Optical Polarization and Ellipsometry
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Optical measurement and interference techniques
- Astro and Planetary Science
- Near-Field Optical Microscopy
- Atmospheric and Environmental Gas Dynamics
- Optical Coatings and Gratings
- Geomagnetism and Paleomagnetism Studies
- Millimeter-Wave Propagation and Modeling
- Advanced Chemical Sensor Technologies
- Neurobiology and Insect Physiology Research
- Advanced Optical Imaging Technologies
- Advanced X-ray Imaging Techniques
- Superconducting and THz Device Technology
- Metamaterials and Metasurfaces Applications
- CCD and CMOS Imaging Sensors
Instituto Nacional de Técnica Aeroespacial
2015-2023
Universidad Complutense de Madrid
2012-2013
Instituto de Óptica "Daza de Valdés"
2012
Universidad de Cantabria
2007-2008
Heriot-Watt University
2004-2006
This paper describes the Polarimetric and Helioseismic Imager on Solar Orbiter mission (SO/PHI), first magnetograph helioseismology instrument to observe Sun from outside Sun-Earth line. It is key meant address top-level science question: How does solar dynamo work drive connections between heliosphere? SO/PHI will also play an important role in answering other questions of Orbiter, as well hosting potential a rich return further science. measures Zeeman effect Doppler shift FeI 617.3nm...
We have measured the optical phase sensitivity of fiber based on poly(methyl methacrylate) under near-single-mode conditions at 632.8 nm wavelength. The elongation is 131 +/- 3 x 10(5) rad m(-1) and temperature -212 26 K(-1). These values are somewhat larger than those for silica consistent with expected basis bulk polymer properties.
The long interaction pathlengths provided by hollow-core photonic bandgap fibers (HC-PBFs) are especially advantageous for the detection of weakly absorbing gases such as methane (CH 4 ).In this paper, we demonstrate sensing with a 1670-nm band HC-PBF.A multiline algorithm is used to fit R( 6) manifold (near 1645 nm) and, in way, measure gas concentration.With method, minimum detectivity 10 ppmv system configuration was estimated.
We describe the first application of multiplexed fibre Bragg grating strain sensors in a multicore fibre.Sets gratings, acting as gauges, are co-located such that they enable curvature to be measured.Multiple sets these gratings allow measured at several points along fibre.This sensor is configured monitor displacement concrete tunnel sections, and was demonstrated capable measurement with resolution ±0.1 mm over range millimeters.
The feasibility of employing a hollow-core photonic bandgap fibre (HC-PBF) to measure methane concentrations below its lower explosive limit is assessed. Using 5.6 m-long HC-PBF as gas cell, the spectrum at ν2+2ν3 band 1300 nm has been recorded and Q-branch 1331.55 selected for sensing purposes. A minimum detectivity 49 ppmv-m system configuration estimated.
We present experimental measurements of the peak splitting reflection spectra fiber Bragg gratings as a result birefringence induced by transverse loading multicore fiber. Measurements show that is function applied load and direction relative to azimuth A model for calculating stress in due an good agreement with our observations.
We demonstrate the sensitivity of Bragg gratings in a multicore fiber to transverse load. The peaks are split because stress-induced birefringence, magnitude which depends upon load and grating position relative axis. Experiments show that set four-core can measure axis angle +/- 5 degrees 15 N m(-1) up 2500 m(-1). consider alternative designs for optimal sensing compare experimental modeled data.
Liquid crystal variable retarders (LCVR) based polarimeters perform temporal polarization modulation by applying a sequence of driving voltages to introduce different optical retardances. However, even after careful design and fabrication, manufacturing tolerances (i.e., slight axis misalignments, instrument residual polarization, activity in the LCVRs...) or final system configuration LCVRs convergent beam, thermal gradient across clear aperture...) produce deviations from ideal setup. As...
This Letter shows the effect of geometrical and material properties lead lines connections on robustness reliability optical antennas working as distributed bolometers. We analyze operational limits biasing voltage using a mutiphysics finite element method. demonstrate that, after evaluating electromagnetic irradiance falling device, is main limiting factor to maintain operative titanium antennas. Results have been experimentally verified by finding values needed destroy Structural damage...
The Multi Element Telescope for Imaging and Spectroscopy (METIS) is one of the remote sensing instruments to be onboard future NASA/ESA Solar Orbiter mission. science nominal mission orbit will take spacecraft from 0.28 0.95 astronomical units Sun, setting challenging variable thermal conditions its payload. METIS an inverted-occultation coronagraph that image solar corona in visible UV wavelength range. In light path a Polarization Modulation Package (PMP) performs polarimetric analysis...
Optical antennas and resonant structures have been extensively investigated due to its potential for electromagnetic detection energy harvesting applications.However their integration into large arrays the role of connection lines between individual has drawn little attention.This is necessary if we want exploit constructively enable economical large-scale fabrication.In this contribution point out some features that an efficient antenna array should address.Experimental measurements on...
In recent years, hollow-core photonic bandgap fibers (HC-PBFs) have been demonstrated to be a promising technology for gas sensing. particular, the long interaction path lengths available with these are especially advantageous detection of weakly absorbing gases such as methane. near-infrared region, methane has strongest absorption band, 2ν<sub>3</sub>, at 1670 nm. However, HC-PBFs were not until recently in this wavelength range and sensing devices based on previously made weaker band...
We present a method to obtain the phase modulation characteristic curve of spatial light modulator (SLM) under severe vibration conditions. The procedure is based on well-known advanced iterative algorithm (AIA), which allows wavefront extraction from unknown phase-shifted interferograms. Generally, AIA used determine and determined shifts are little interest. In contrast, in our method, main goal using induced by an SLM during calibration procedure. Using segmented approach calibration,...
Gas detection and gas sensing based on hollow core photonic bandgap fiber (HC-PBF) is a very promising technique due to the long interaction light-gas lengths that are achievable. However, path-lengths also imply higher filling times of response systems what can constitute serious practical inconvenience. In this paper, high sensitivity maintained but sensor time reduced by using multiple-coupling gaps. The results conclusions extracted from systematic experimental study (comparing spectra...
We describe the first application of multiplexed fibre Bragg grating strain sensors in a multicore fibre. Sets gratings, acting as gauges, are co-located such that they enable curvature to be measured. Multiple sets these gratings allow measured at several points along This sensor is configured monitor displacement concrete tunnel sections, and was demonstrated capable measurement with resolution ±0.1 mm over range millimeters.
An enhanced optical system design for NDIR gas detection is presented. Multiple paths lengths within the same cavity are used to auto reference system. The has good thermo-mechanical stability: it requires no special thermal stabilization, shows sensitivity emitter drift and moving parts involved. Long term stability, virtually zero-drift sub-ppm level were achieved using commercial thermopile sensors a modulated at low frequency (~0.5 Hz). Experimental tests performed carbon monoxide (CO)...
The Full Disk Telescope is part of the Polarimetric Helioseismic Instrument on board future Solar Orbiter ESA/NASA mission. It will provide full-disk measurements photospheric magnetic field vector and line-of-sight velocity, as well continuum intensity in visible wavelength range. Along this mission, it expected that thermal drifts induce image focus displacements. Consequently, providing an autofocus system mandatory to prevent degradation. refocusing based autonomous contrast analysis...
The Tunable Magnetograph (TuMag) is one of the three post-focus instruments onboard SUNRISE III mission. It consists a one-meter aperture telescope balloon within NASA Long Duration Balloon Program to study solar dynamics. TuMag diffraction-limited imager, high sensitivity polarimeter and resolution spectrometer. will be able magnetic fields at spatial (~100km on surface). make images surface field after measuring state polarization light selected spectral lines: Fe I lines 525.02nm...
An experimental setup to measure the three-dimensional phase-intensity distribution of an infrared laser beam in focal region has been presented. It is based on knife-edge method perform a tomographic reconstruction and transport intensity equation-based numerical obtain propagating wavefront. This approach allows us characterize focalized when use image or interferometer arrangements not possible. Thus, we have recovered phase aberrated dominated by astigmatism. The evolution fully...
Our group in the Space Optics Department at INTA has been working during more than 20 years development of devices based on liquid crystals for optical payloads onboard space missions. Currently, there are three our successfully operation PHI and METIS instruments Solar Orbiter ESA/NASA mission. Therefore, they have highest technology maturity level, TRL9 (Technology Readiness Level). To best knowledge, we pioneers use polarization modulators a telescope or camera platform. <br/> Liquid...
Liquid Crystal Polarization Rotators (LCPRs) have been developed for the Miniaturized Absolute Magnetometer (MAM) instrument in NanoMagSat project, an ESA's SCOUT program mission. This project consists of a constellation three nanosatellites aimed to study Earth's magnetic and ionospheric environment based on 16U CubeSat-type structure. The MAM is optically pumped scalar vector magnetometer derived from ASM flown ESA Swarm In this type instruments, device rotate direction incident linear...