17documents trouvés
Self-mixing laser sensor for large displacements: signal recovery in the presence of speckle
U.ZABIT, O.BERNAL, T.BOSCH
OSE
Revue Scientifique : IEEE Sensors Journal, Vol.13, N°2, pp.824-831, Février 2013 , N° 12667
Lien : http://hal.archives-ouvertes.fr/hal-00762287
Diffusable
Plus d'informations
Abstract
Laser self-mixing (SM) sensors have been successfully used to measure displacement in the absence of speckle. However, speckle deforms the SM signal rendering it unusable for standard displacement extraction techniques. This article proposes a new signal processing technique, based on tracking the signal envelope, to remedy this problem. Algorithm was successfully employed to measure long-range displacements (25 mm), in the presence of speckle and the lateral movement of the target, both causing severe corruption of the SM signal. It therefore enabled the use of the sensor on non-cooperative targets without the need for sensor positioning and/or alignment. The results have been obtained for SM signals where the envelope amplitude has varied by a factor 28, without a loss of interferometric fringes. The use of this technique effectively removes the need for opto/electro-mechanical components traditionally used to measure long-range displacement in the presence of speckle.
Flow profile measurement in microchannel using the optical feedback interferometry sensing technique
L.CAMPAGNOLO, M.NIKOLIC, J.PERCHOUX, Y.L.LIM, K.BERTLING, K.LOUBIERE, L.PRAT, A.D.RAKIC, T.BOSCH
OSE, Queensland, LGC
Revue Scientifique : Microfluidics and Nanofluidics, Vol.14, N°1-2, pp.113-119, Janvier 2013 , N° 13003
Lien : http://hal.archives-ouvertes.fr/hal-00757538
Diffusable
Plus d'informations
Abstract
The need to accurately measure flow profiles in microfluidic channels is well recognised. In this work, we present a new optical feedback interferometry (OFI) flow sensor that accurately measures local velocity in fluids and enables reconstruction of a velocity profile inside a microchannel. OFI is a self-aligned interferometric technique that uses the laser as both the transmitter and the receiver thus offering high sensitivity, fast response, and a simple and compact optical design. The system described here is based on a commercial semiconductor laser and has been designed to achieve a micrometer-range spatial resolution. The sensor performance was validated by reconstructing the velocity profile inside a circular cross-section flow-channel with 320 µm internal diameter, with a relative error smaller than 1.8 %. The local flow velocity is directly measured, thus avoiding the need for model based profile calculation and uncertainties inherent to this approach. The system was validated by successfully extracting the flow profiles in both Newtonian and shear-thinning liquids.
Laser dynamics in sawtooth-like self-mixing signals
R.TEYSSEYRE, F.BONY, J.PERCHOUX, T.BOSCH
OSE
Revue Scientifique : Optics Letters, Vol.37, N°18, pp.3771-3773, Septembre 2012 , N° 12738
Lien : http://hal.archives-ouvertes.fr/hal-00757566
Diffusable
Plus d'informations
Abstract
In this Letter, we experimentally show that transient phenomenons in self-mixing signals from a moving target contain information about the target reflectivity and distance. These transient phenomenons are well explained with a dynamical model of the laser diode, which is used to trace an abacus giving the target reflectivity and distance from a measured high-bandwidth, self-mixing signal.
Digital to analog conversion methodology applied to self-mixing displacement signals
A.LUNA ARRIAGA, F.BONY, T.BOSCH
OSE
Manifestation avec acte : International Conference on Vibration Measurements by Laser and Noncontact Techniques (AIVELA 2012), Ancona (Italie), 27-29 Juin 2012, pp.125-131 , N° 12485
Lien : http://hal.archives-ouvertes.fr/hal-00716538
Non diffusable
128046Robust real-time self-mixing interferometric laser vibration sensor with embedded MEMS accelerometer
U.ZABIT, O.BERNAL, T.BOSCH
OSE
Manifestation avec acte : International Conference on Vibration Measurements by Laser and Noncontact Techniques (AIVELA 2012), Ancona (Italie), 27-29 Juin 2012, pp.148-155 , N° 12493
Lien : http://hal.archives-ouvertes.fr/hal-00733534
Diffusable
Plus d'informations
Abstract
In this paper, we present a real-time implementation of a Self-Mixing (SM) interferometric laser diode (LD) based vibration sensor coupled with an embedded MEMS (microelectromechanical system) accelerometer. Such a sensor allows measuring correct target movements even when the LD based SM sensor is subject to extraneous movements. This results in a vibration sensing system that can be used for embedded applications as there is no more need of keeping the sensor stationary. Such an approach opens the way for the use of such laser sensors in conditions where the use of anti-vibration support is not available or possible. The proposed data fusion between a MEMS accelerometer and a LD based SM sensor results in a robust, compact and low-cost sensing system.
Error analysis due to laser beams misalignment of a double laser self-mixing velocimeter
B.TANIOS, F.BONY, T.BOSCH
OSE
Manifestation avec acte : International Conference on Vibration Measurements by Laser and Noncontact Techniques (AIVELA 2012), Ancona (Italie), 27-29 Juin 2012, pp.139-147 , N° 12436
Lien : http://hal.archives-ouvertes.fr/hal-00717214
Non diffusable
127854Real time displacement sensor based on self-mixing interferometry
A.LUNA ARRIAGA, F.BONY, T.BOSCH
OSE
Manifestation avec acte : IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2012), Graz (Autriche), 13-16 Mai 2012, pp.1370-1374 , N° 12379
Lien : http://hal.archives-ouvertes.fr/hal-00716500
Diffusable
Plus d'informations
Abstract
This paper deals with the real time reconstruction of a self-mixing displacement signal under devices with limited resources. By implementing a first-order-hold interpolation used in digital-to-analog converters, the signal recovery problem has been reduced to the efficient usage of an adaptive filter with high potential of parallelism, suitable to meet hard timing constraints, low memory usage and easily integrable with other mitigation algorithms of the physical phenomena proper to laser behavior, towards the creation of a robust embedded displacement sensor.
Self-mixing sensor for real-time measurement of harmonic and arbitrary displacements
U.ZABIT, O.BERNAL, T.BOSCH
OSE
Manifestation avec acte : IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2012), Graz (Autriche), 13-16 Mai 2012, 5p. , N° 12285
Lien : http://hal.archives-ouvertes.fr/hal-00708480
Diffusable
Plus d'informations
Abstract
A real-time self-mixing laser displacement sensor is presented that uses a fast consecutive-samples based unwrapping algorithm. The processing is achieved at a rate of 125KHz by an integrated micro-converter (ADuC7020) embedded on the SM sensor. Arbitrary and harmonic displacements have been measured in real-time with λ /10 precision as compared with the reference built-in capacitive feedback sensor of the target, where λ is the laser wavelength. The algorithm does not require any parameter estimation or huge memory and corrects possible false fringe detections. This results in a compact, integrated, precise and self-aligned laser sensor that costs less than 40 $.
Optimization of the performances of a self-mixing velocimeter by using a double laser diode configuration
B.TANIOS, F.BONY, T.BOSCH
OSE
Manifestation avec acte : IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2012), Graz (Autriche), 13-16 Mai 2012, pp.1944-1948 , N° 12380
Lien : http://hal.archives-ouvertes.fr/hal-00716977
Diffusable
Plus d'informations
Abstract
In this paper, we present a self-mixing double-head laser diode velocimeter. Several analyzes are performed to determine the optimal architecture of the double laser diode in terms of accuracy. We demonstrate that the double-head laser diode is insensitive to angle variation contrary to the single laser diode. The accuracy of the double-head laser diode sensor is verified by simulations and experiments.
Amélioration d'un capteur optoélectronique embarqué par interférométrie à rétro-injection optique
U.ZABIT, O.BERNAL, T.BOSCH
OSE
Manifestation avec acte : Colloque International Francophone du club CMOI/SFO "Contrôles et Mesures Optiques pour l'Industrie", Lille (France), 21-25 Novembre 2011, 6p. , N° 11809
Diffusable
126601