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18375
23/11/2018

Acoustic flat lensing using an indefinite medium

M.DUBOIS, J.PERCHOUX, A.VANEL, C.TRONCHE, Y.ACHAOUI, G.DUPONT, K.BERTLING, A.D.RAKIC, T.ANTONAKAKIS, S.ENOCH, R.ABDEDDAIM, R.V.CRASTER, S.GUENNEAU

Fresnel, OSE, Imperial College, I2C, FEMTO-ST, IRPHE, QUT, Multiwave Technologie

Rapport LAAS N°18375, Novembre 2018, 5p.

Lien : https://hal.archives-ouvertes.fr/hal-01917261

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Abstract

Acoustic flat lensing is achieved here by tuning a phononic array to have indefinite medium behaviour in a narrow frequency spectral region along the acoustic branch in the irreducible Brillouin zone (IBZ). This is confirmed by the occurrence of a flat band along an unusual path in the IBZ and by interpreting the intersection point of isofrequency contours on the corresponding isofrequency surface; coherent directive beams are formed whose reflection from the array surfaces create lensing. Theoretical predictions using a mass-spring lattice approximation of the phononic crystal (PC) are corroborated by time-domain experiments, airborne acoustic waves generated by a source with a frequency centered about 10.6 kHz, placed at three different distances from one side of a finite PC slab, constructed from polymeric spheres, yield distinctive focal spots on the other side. These experiments evaluate the pressure field using optical feedback interferometry and demonstrate precise control of the three-dimensional wave trajectory through a sonic crystal.

145253
18399
01/05/2018

Visualization of an acoustic stationary wave by optical feedback interferometry

PF.URGILES ORTIZ, J.PERCHOUX, A.LUNA ARRIAGA, F.JAYAT, T.BOSCH

OSE, I2C

Revue Scientifique : Optical Engineering, Vol.57, N°5, 051502p., Mai 2018 , N° 18399

Lien : https://hal.laas.fr/hal-01939780

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Abstract

This paper presents an experimental technique for two-dimensional imaging of dynamic acoustic pressure changes that is applied to visualize a stationary acoustic wave. This technique uses the optical feedback interferometry sensing scheme with a near-infrared laser diode and a two-axis scanning system. The stationary acoustic wave is generated by using a 40 kHz piezoelectric transducer pointing toward a concave acoustic reflector. The acoustic pressure dynamic changes are measured due to its impact on the propagating medium refractive index, which variation is integrated along the laser optical path from the laser diode to a distant mirror and back. The imaging system records a 100×50  pixels image of the acoustic pressure in 66 min.

145435
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.

142333
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
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
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
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.

141237
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
17371
01/07/2017

Optical feedback interferometry : from basics to applications of laser flowmetry

E.E.RAMIREZ MIQUET, J.PERCHOUX, R.DA COSTA MOREIRA, Y.ZHAO, A.LUNA ARRIAGA, C.TRONCHE, O.SOTOLONGO-COSTA

OSE, I2C, UAEM

Revue Scientifique : Revista Cubana de Fisica, Vol.34, N°1, pp.48-57, Juillet 2017 , N° 17371

Lien : https://hal.laas.fr/hal-01611682

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Abstract

Optical feedback interferometry (OFI) is a contactless technique that is employed for measuring parameters related to object's motion. The light emitted by a laser is backreflected or scattered from a moving object and a small portion of the scattered waves re-enters the laser cavity and impacts the laser's emission properties. We review the theoretical basics of optical feedback interferometry and explain the physical principles in the frame of laser Doppler flowmetry. We present a model derived from the Lang and Kobayashi rate equations to show the particular features of the optical feedback signal in temporal and frequency domain. In addition, we present experimental measurements relative to the detection of flowing particles in a microchannel, the measurement of unsteady flows and the quantification of blood perfusion in skin, which demonstrate the potential use of OFI sensors in the assessment of fluidic systems of interest in chemical and biomedical engineering.

141242
16613
03/11/2016

An embedded 2D imager for microscale flowmetry based on optical feedback interferometry

R.DA COSTA MOREIRA, A.QUOTB, C.TRONCHE, F.JAYAT, A.LUNA ARRIAGA, T.BOSCH, J.PERCHOUX

OSE, I2C

Manifestation avec acte : IEEE SENSORS 2016 du 30 octobre au 02 novembre 2016, Orlando (USA), Novembre 2016, 3p. , N° 16613

Lien : https://hal.laas.fr/hal-01435994

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Abstract

We present a compact and embedded imager based on the Optical Feedback Interferometry (OFI) sensing scheme that gives quantitative information about the velocity in fluids at micro-scale through the Doppler-Fizeau effect. This sensor can reach a spatial imaging resolution up to 5 μm in 2D scanning using a MEMS 2 axis beam-steering mirror. As an illustration of the imager performances, a 500 μm circular channel flow profile is measured. An image (300x50 pixels) of a 100 μm square section channel is successfully obtained thus validating the device.

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