10documents 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.
Qualifying a CMOS instrumentation chain for charged particles detection in the space environment
F.BOUYJOU, O.BERNAL, H.TAP, G.PICAUT, J.A.SAUVAUD
OSE, EXT, IRAP
Manifestation avec acte : International Workshop on Analogue and Mixed Signal Integrated Circuits For Space Applications (AMICSA 2012), Noordwijk (Pays Bas), 27-29 Août 2012, 7p. , N° 12542
Lien : http://hal.archives-ouvertes.fr/hal-00737979
Diffusable
Plus d'informations
Abstract
For the solar system exploration and the distant universe study, the in-situ particle energy measurement and/or the electron/ion event detection are needed. For our on-board satellite application, the particle sensor that is used to convert particle momentum into measurable electrical charges is a Microchannel plate (MCP). The performances of such a sensor depend on the Analog-Front-End (AFE) circuit used to process the incoming charges. Consequently, a CMOS instrumentation chain for charged particle detection has been designed and tested under space environment. This AFE contains 16 channels, all of which includes a charge pre-amplifier (CPA), a pulse shaper (PS) and a monostable circuit to perform the detection. Using a standard 0.35 μm CMOS process, the proposed AFE has a conversion gain of 0.9mV/fC for electrons and a power consumption of 2.15 mW per channel. Its dynamic range is 79 dB and it is possible to convert charges up to 1.5 pC. The circuit works properly from -20 to 80°C with a measured analog gain variation of 1μV.fC-1.K-1. As far as crosstalk is concerned, experiments show that the proposed instrumentation chain can detect negative charges down to 122 fC without any ambiguity. Further, the proposed chain was irradiated at an average rate of 140 rads (Si) per hour up to 360 krad without any functionality loss.
Robust 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.
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 $.
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
126601A novel FBG interrogation method for potential structural health monitoring applications
T.PHAM, HC.SEAT, O.BERNAL, M.SULEIMAN
LNCMI-T, OSE
Manifestation avec acte : IEEE SENSORS 2011, Limerick (Irelande), 28-31 Octobre 2011, pp.1341-1344 , N° 11811
Diffusable
126605A self-mixing displacement sensor compensating parasitic vibration with a MEMs accelerometer
U.ZABIT, O.BERNAL, T.BOSCH
OSE
Manifestation avec acte : IEEE SENSORS 2011, Limerick (Irelande), 28-31 Octobre 2011, pp.1386-1389 , N° 11813
Diffusable
126609Position Sensing and Electrostatic Actuation Circuits for 2-D Scanning MEMS Micromirror
DD.PHAM, RP.SINGH, DL.YAN, KT.TIEW, O.BERNAL, T.LANGER, A.HIRSHBERG, M.JE
OSE, CAESAREA, A*STAR
Manifestation avec acte : Defense Science Research Conference and Expo (DSR), Singapour (Singapour), 3-5 Août 2011 , N° 11819
Diffusable
126629A low power CMOS instrumentation chain for micro-channel plates in astrophysics
F.BOUYJOU, O.BERNAL, H.TAP, J.A.SAUVAUD
OSE, CESR
Revue Scientifique : IEEE Sensors Journal, Vol.11, N°4, pp.1040-1045, Avril 2011 , N° 11806
Diffusable
126595A MEMS accelerometer embedded in a self-mixing displacement sensor for parasitic vibration compensation
U.ZABIT, O.BERNAL, T.BOSCH, F.BONY
OSE
Revue Scientifique : Optics Letters, Vol.36, N°5, pp.612-614, Mars 2011 , N° 11805
Diffusable
126593