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Publications de l'équipe OSE

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99documents trouvés

18027
02/03/2018

Comprehensive modeling of multimode fiber sensors for refractive index measurement and experimental validation

H.APRIYANTO, G.RAVET, O.BERNAL, M.CATTOEN, HC.SEAT, V.CHAVAGNAC, F.SURRE, J.H.SHARP

OSE, GET- UMR 5563, City University, Glasgow

Rapport LAAS N°18027, Mars 2018, 11p.

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142554
18016
08/02/2018

Optical feedback flowmetry: Impact of particle concentration on the signal processing method

R.ATASHKHOOEI, E.E.RAMIREZ MIQUET, R.DA COSTA MOREIRA, A.QUOTB, S.ROYO, J.PERCHOUX

UPC, MPQ, OSE

Revue Scientifique : IEEE Sensors Journal, Vol.18, N°4, pp.1457-1463, Février 2018 , N° 18016

Lien : https://hal.archives-ouvertes.fr/hal-01685176

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Abstract

Optical feedback interferometry (OFI) based flowmetry enables simple, robust, self-aligned and low cost systems to measure the fluid flow velocity with reasonable accuracy. The particle concentration in the fluid causes significant changes in the signal of OFI sensors. While the spectral analysis of the particle induced Doppler shift remains as the most usual approach to determine the flow properties, different processing algorithms have been proposed in order to evaluate the average flow velocity within the measurement volume. In this paper, the validity of the commonly used methods with regards to particle concentrations and flow rates is verified.

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17383
15/11/2017

Analysis and implementation of a direct phase unwrapping method for displacement measurement using self-mixing interferometry

A.EHTESHAM, U.ZABIT, O.BERNAL, G.RAJA, T.BOSCH

Riphah, OSE, UETTAXILA

Revue Scientifique : IEEE Sensors Journal, Vol.17, N°22, pp.7425-7432, Novembre 2017, DOI 10.1109/JSEN.2017.2758440 , N° 17383

Lien : https://hal.archives-ouvertes.fr/hal-01617743

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Abstract

Self-Mixing (SM) or optical feedback interferometry has been widely used for displacement and velocity measurement applications. For metric information retrieval with < λ/2 precision, various phase unwrapping methods have been proposed. However, these are computationally heavy and require large number of hardware resources, thereby hindering the development of real-time, embedded solutions for large bandwidth applications. In this regard, a simple and efficient feedback phase retrieval algorithm, called Consecutive Samples based Unwrapping (CSU) is presented. Detailed analysis of its error performance has been conducted as a function of key optical feedback parameters. A theoretical study has also been conducted to explain as to why such good error performance is obtained for such a simple algorithm by establishing a linear relation between the modulated laser power signal and the laser phase in the absence of optical feedback for specific ranges of key optical feedback parameters. We applied CSU on various simulated and experimentally acquired signals using SMI for the retrieval of harmonic and arbitrary displacements and found out that CSU retrieves target displacement with a precision of about λ/10 while consuming much less time and hardware resources. The paper also presents FPGA based hardware design results of CSU and compares its performance with a traditional analytical phase unwrapping method in terms of maximum clock frequency, latency, and on-chip hardware resources. This hardware comparison strongly establishes the advantages of such a fast and computationally light algorithm, readily suitable for large bandwidth, embedded, real-time sensing applications.

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17529
01/11/2017

Single nano-particle flow detection and velocimetry using Optical Feedback Interferometry

R.DA COSTA MOREIRA, J.PERCHOUX, Y.ZHAO, C.TRONCHE, F.JAYAT, T.BOSCH

OSE, MICA, I2C

Manifestation avec acte : IEEE SENSORS 2017 du 31 octobre au 01 novembre 2017, Glasgow (Ecosse), Novembre 2017, 3p. , N° 17529

Lien : https://hal.archives-ouvertes.fr/hal-01685162

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Abstract

We present a sensing technique based on the Optical Feedback Interferometry (OFI) scheme in a laser diode that enables single particle detection at micro and nano-scales through the Doppler-Fizeau effect. Thanks to the proposed signal processing, this sensing technique can detect the presence of single spherical micro/nanoparticles and measure their velocity, even while their diameter is below half the laser wavelength. The method was validated with polystyrene spheres with diameter ranging from 196 nm to 10.14 µm flowing in diluted aqueous solutions. These results indicate potential applications for the biomedical and chemical engineering fields

142466
17517
01/11/2017

Optical feedback interferometry for raster scan profilometry

B.GRIMALDI, A.LUNA ARRIAGA, F.BONY, C.TRONCHE, J.PERCHOUX

OSE, I2C

Manifestation avec acte : IEEE SENSORS 2017 du 31 octobre au 01 novembre 2017, Glasgow (Ecosse), Novembre 2017, 3p. , N° 17517

Lien : https://hal.archives-ouvertes.fr/hal-01685167

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Abstract

This paper evaluates optical feedback interferome-try for raster scan profilometry applications. It is shown both experimentally and theoretically that the spot size on target plays a major role as the phase distribution of the scattering contributions impacts drastically the sensor signal.

142355
17352
28/09/2017

Optical feedbacksensinginmicrofluidics:designandcharacterizationof VCSEL-based compactsystems

Y.ZHAO

MICA, OSE

Doctorat : INSA de Toulouse, 28 Septembre 2017, 151p., Président: A.HUMEAU-HEURTIER, Rapporteurs: P.DEBERNARDI, S.ROYO, Examinateurs: M.NORGIA, Directeurs de thèse: V.BARDINAL DELAGNE, J.PERCHOUX , N° 17352

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Résumé

L’interférométrie par retro-injection optique (OFI) est une technique de détection émergente pour les systèmes fluidiques. Son principe est basé sur la modulation de la puissance et/ou de la tension de polarisation d’une diode laser induites par interférence entre le faisceau propre de la cavité laser et la lumière réfléchie ou rétro-diffusée par une cible distante. Grâce à l’effet Doppler, cette technique permet de mesurer précisément la vitesse de particules en mouvement dans un fluide, et de répondre aux besoins croissants de mesure de débit dans les systèmes d’analyse biomédicale ou chimique. Dans cette thèse, les performances de la vélocimétrie par rétro-injection optique sont étudiées théoriquement et expérimentalement pour le cas de micro-canaux fluidiques. Un nouveau modèle numérique multi-physique (optique, optoélectronique et fluidique) est développé pour reproduire les spectres Doppler expérimentaux. En particulier, les effets de la concentration en particules, de la distribution angulaire de la diffusion du laser par les particules, ainsi que du profil d’écoulement dans le canal sont pris en compte. Un bon accord est obtenu entre les vitesses d’écoulement théoriques et expérimentales. Ce modèle est également appliqué avec succès à la mesure de la vitesse locale dans un micro-canal et à l’analyse de l’impact sur le signal des configurations particulières de canal. Enfin, la conception d’un capteur OFI tirant parti des avantages des Lasers à Cavité Verticale à Emission par la Surface (VCSEL) est proposée. Grâce au développement de techniques de microfabrication à base de matériaux polymères, un premier démonstrateur composé d’un VCSEL à lentille intégrée est réalisé et testé sans aucune optique macroscopique additionnelle. Les résultats obtenus en termes de mesure de flux sur des canaux micro-fluidiques de tailles différentes valident l’intérêt de cette approche et ouvrent la voie vers la réalisation de capteurs OFI ultra-compacts.

Abstract

Optical feedback interferometry (OFI) is an emerging sensing technique which has been studied in fluidic systems. This sensing scheme is based on the modulation of the laser emission output power and/or the junction voltage induced by the interaction between the back-scattered light from a distant target and the laser inner cavity light. Thanks to the Doppler Effect, OFI can precisely measure the velocity of seeding particles in flowing liquids which is much required in chemical engineering and biomedical fields. In the present thesis, optical feedback interferometry performance for microscale flow sensing is studied theoretically and experimentally. A new numerical modeling approach based on multi-physics numerical simulations for OFI signal simulation in the micro-scale flowmetry configuration is presented that highlight the sensor performances. In this model, many factors are involved such as particle concentration and laser-particle scattering angle distribution and flow velocity distribution. The flow rate measurement shows good agreement with the modeling. The implementation of OFI based sensors in multiple fluidic systems, investigating the impact of the fluidic chip specific configuration on the sensor signal. Finally, a compact OFI flowmetry sensor based on Vertical-Cavity Surface-Emitting Lasers (VCSELs) using micro optical fabrication techniques is demonstrated as well. The simulation method for the design and the microfabrication procedures are detailed. After an evaluation of the experimental results, the capabilities of this new OFI sensor in microfluidic measurements are emphasized, thus demonstrating an open path towards ultra-compact microfluidic systems based on the OFI sensing technique.

Mots-Clés / Keywords
Optical feedback interferometry; VCSEL; Microfluidics; Flow measurement; Doppler effect; Interférométrie par réinjection optique; Micro-fluidique; Mesure de débit; Effet doppler;

141153
17353
15/09/2017

Characterization of acoustic sources by optical feedback interferometry

PF.URGILES ORTIZ, J.PERCHOUX, T.BOSCH

OSE

Revue Scientifique : Proceedings, Vol.4, N°1, 348p., Septembre 2017 , N° 17353

Lien : https://hal.laas.fr/hal-01611659

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Abstract

Sound can be described as the propagation of pressure variations in compressible media that involves compression and expansion and induces a change in the density of the medium. This change in acoustic pressure as it induces a change of the refractive index can be measured by optical methods, the most recent being the optical feedback interferometry. With this technique, a laser diode is beaming on a reflective surface thus creating a cavity where the acoustic wave propagates. This paper presents anovel experimental technique to measure radiation pattern of acoustic sources based on optical feedback interferometry in a laser diode.

141155
17384
15/09/2017

All analog processing of speckle affected self-mixing interferometric signals

A.SIDDIQUI, U.ZABIT, O.BERNAL, G.RAJA, T.BOSCH

Riphah, OSE, UETTAXILA

Revue Scientifique : IEEE Sensors Journal, Vol.17, N°18, pp.5892-5899, Septembre 2017 , N° 17384

Lien : https://hal.archives-ouvertes.fr/hal-01617748

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Abstract

Self-mixing (SM) or optical feedback interferometry has been extensively used for high precision displacement and vibration sensing. However, presence of speckle can significantly degrade the SM interferometric signal and cause changes in signal amplitude as well as in the operating optical feedback regime, resulting in reduction in measurement precision. Previously, different advanced digital signal processing techniques have been proposed to undo the effects caused by speckle. However, their complex and computationally heavy nature inhibits their use for real-time, high bandwidth sensing applications. In this regard, an all analog signal processing algorithm has been presented in this paper, which allows real-time processing of speckle affected SM signal while using standard analog circuits. Various simulations indicated that it is able to correctly process speckle affected SM signals having amplitude variation of at least one order and optical feedback parameter C reduction until 0.5. This proposed algorithm has been tested on experimentally acquired speckle affected SM signals and found capable of dealing with variations in optical feedback regime and amplitude modulation of SM signals, in accordance with simulation results. The developed hardware prototype circuit measures a maximum displacement amplitude of 0.4 mm at a maximum target velocity of 8 mm/s for an SM sensor with a laser wavelength of 785 nm as long as C >0.5 . The proposed all analog processing could be a significant step toward a robust, low-cost, integrated, real-time SM displacement sensor.

141318
17367
01/09/2017

Optical feedback interferometry flowmetry sensor in microfluidics chip

Y.ZHAO, J.PERCHOUX, T.CAMPS, V.BARDINAL

MICA, OSE

Revue Scientifique : Proceedings, Vol.4, N°1, 4p., Septembre 2017 , N° 17367

Lien : https://hal.laas.fr/hal-01611672

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Abstract

Optical feedback interferometry (OFI) applied to microscale flow sensing is studied theoretically and experimentally. A new model is investigated that predicts the OFI signal. This model is based on the Lang-Kobayashi equations and highlights the importance of the laser beam propagation and the laser-particle scattering performances. For the first time, the angle distribution of the scattered light is involved in the model. The model evaluates the impact on the OFI signal of the light propagation in the micro-scale channel geometry. The flow rate measurement shows good agreement with the model.

141235
17368
01/09/2017

Impact of high coupling factor in absolute distance measurement with self-mixing interferometry

M.VENG, J.PERCHOUX, F.BONY

OSE

Revue Scientifique : Proceedings, Vol.1, N°4, 373p., Septembre 2017 , N° 17368

Lien : https://hal.laas.fr/hal-01611675

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Abstract

Absolute distance measurement by means of a self-mixing interferometer (SMI) can be obtained by modulating the laser frequency. This modulation is typically achieved through the modulation of the laser injection current with a triangle waveform. Various strategies have been proposed to increase the performances and recent researches have shown real-time performance of SMI with resolution reaching 100 μm for distances up to 2 m. In the present paper, we demonstrate for the first time, both experimentally and by modeling, that with high coupling factors between the laser and the target, disappearance of interferometric fringes occurs that can strongly affect the measurement reliability.

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