Laboratoire d’analyse et d’architecture des systèmes
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.
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.
U.ZABIT, K.SHAHEEN, M.NAVEED, O.BERNAL, T.BOSCH
Revue Scientifique : IEEE Sensors Journal, Vol.18, N°22, pp.9195-9202, Novembre 2018 , N° 18512
Laser feedback-based self-mixing interferometry (SMI) has been demonstrated for diverse metric sensing applications. Typically, SMI sensors are based on such laser diodes (LDs) which provide mono-modal emission resulting in SMI signals in which each interferometric fringe occurs due to change in optical path length of λ/2, where λ is emission wavelength. However, in case multiple laser modes undergo SMI, then each mode contributes its own set of fringes. As LDs can emit multiple modes under variable operating conditions, so, non-detection of multiple SMI modes can cause drastic increase in measurement error due to wrong interpretation of fringes. Previously, the detection of multiple laser modes undergoing SMI was achieved by adding spectroscopic instruments to the SMI set-up. This, however, compromises the inherent simplicity of SMI sensing. In this paper, an automatic SMI-based multi-modality detection method is proposed which is able to detect if multiple modes of deployed LD are undergoing SMI and are contributing additional fringes within the SMI signal under variable sensing conditions. Such detection enables correct interpretation of SMI fringe count and can be used to signal occurrence of mode-hopping or secondary mode excitation. The method uses an artificial neural network, able to automatically identify uni-, bi-, or tri-modal SMI signals. Two different LDs (emitting at 637 and 650 nm) were used to acquire 131 experimental uni-, bi-, and tri-modal SMI signals for variable operating conditions and target vibration amplitude. The proposed system has achieved modality detection accuracy of 98.57% on 70 unseen experimental SMI signals.
L.CIOTIRCA, O.BERNAL, J.ENJALBERT, T.CASSAGNES, H.TAP, H.BEAULATON, S.SAHIN
OSE, NXP -Semiconductors, ENSEEIHT
Revue Scientifique : IEEE Sensors Journal, Vol.18, N°15, pp.6106-6114, Août 2018 , N° 18298
Over the past years, cutting-edge advances in electronics and microfabrication have allowed the integration of multiple sensors within integrated analog and digital circuits to design Micro Electro Mechanical Systems (MEMS). The multiple sensor integration or sensor fusion, enables both cost and surface reduction, while maintaining high performances. This paper presents a new control system for an underdamped three-axis accelerometer, which allows the co-integration in the same cavity with a three-axis Coriolis gyroscope, to design a Six Degrees of Freedom (DoF) combo sensor. The accelerometer Analog Front End (AFE) consumes from a. power supply and is able to reach its steady state in compared to a open-loop and no damping configuration. The transducer control is implemented using a simultaneous multirate electrostatic damping method. To conclude on the closed loop system stability, an innovative approach, based on the multirate signal processing, theory has been developed.
HC.SEAT, M.CATTOEN, O.BERNAL, F.LIZION, G.RAVET, L.MICHAUT, J.CHERY, F.BOUDIN, P.BERNARD, C.BRUNET, P.CHAWAH, G.PLANTIER, A.SOURICE, S.GAFFET, D.BOYER, A.CAVAILLOU
OSE, IDEA, Geoscience, CNRS, ENS Paris, IPGP, LAUM, LSBB, CNRS
Manifestation avec acte : Congrès Optique ( OPTIQUE ) 2018 du 03 juillet au 06 juillet 2018, Toulouse (France), Juillet 2018 , N° 18173
K. W.WONG, O.BERNAL, A.CARA, A.FEDOROV, R.BARUAH, R.MATHON, C.AMOROS, H.TAP, B.LAVRAUD
Singapore, OSE, IRAP
Manifestation avec acte : International Workshop on Analogue and Mixed-Signal Integrated Circuits for Space Applications ( AMICSA ) 2018 du 17 juin au 20 juin 2018, Louvain (Belgique), Juin 2018, 2p. , N° 18527
Low-power analog front-end circuits for channeltron detectors (or Channel Electron Multiplier: CEMs) have been fabricated in 0.35-μm CMOS technology to characterize low energy solar wind particles. They have been designed to readout signals for incident charges ranging from 50 fC to 20 pC. Each front end circuit consists of a charge preamplifier, an amplifier, a discriminator, a monostable circuit and a LVDS. Requirement on the complete front end is to consume less than 6.5 mW/channel for a maximum event detecting rate of 40 MHz.
PF.URGILES ORTIZ, J.PERCHOUX, A.LUNA ARRIAGA, F.JAYAT, T.BOSCH
Revue Scientifique : Optical Engineering, Vol.57, N°5, 051502p., Mai 2018 , N° 18399
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.
H.APRIYANTO, G.RAVET, O.BERNAL, M.CATTOEN, HC.SEAT, V.CHAVAGNAC, F.SURRE, J.H.SHARP
OSE, GET- UMR 5563, City University, Glasgow
Revue Scientifique : Scientific Reports, Vol.8, 5912p., Avril 2018 , N° 18027
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
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.
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
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.
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
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