Christine Barthod - Academia.edu (original) (raw)

Papers by Christine Barthod

Journal of Physics: Conference Series, 2013

2016 IEEE 18th International Conference on e-Health Networking, Applications and Services (Healthcom), 2016

... Mechatronical approach for the definition of future functionalities for a chest simulator. L.... more ... Mechatronical approach for the definition of future functionalities for a chest simulator. L. Maréchal 1 , Christine Barthod 1 , JC Jeulin, Gérard Gautier 1 , Jacques Lottin 1. (05/2008). 1 : Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME). Université de Savoie. ...

Biostec, 2008

Luc Marechal, Christine Barthod, Gérard Gautier, Jacques Lottin Laboratory SYstems and Materials ... more Luc Marechal, Christine Barthod, Gérard Gautier, Jacques Lottin Laboratory SYstems and Materials for MEchatronics (SYMME),University of Savoie, BP80439, Annecy-le-Vieux, France luc.marechal@univ-savoie.fr, christine.barthod@univ-savoie.fr

... Mechatronics for real time quality control in hadrontherapy. Madjid Boutemeur 1 , Christine B... more ... Mechatronics for real time quality control in hadrontherapy. Madjid Boutemeur 1 , Christine Barthod 1 , Gérard Gautier 1 , Jacques Lottin 1 , Laurent Goujon 1 , M. Passard 1. (14/07/2007). 1 : Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME). ...

The present paper proposes an optical device for measuring low-frequency (50-60 Hz) high electric... more The present paper proposes an optical device for measuring low-frequency (50-60 Hz) high electric fields (0-200 kV.cm 1 ) using a LiNbO 3 crystal as sensing medium without any contacting electrode. Thus, a good galvanic insulation of material and person is obtained. An experimental setup is developed in the laboratory by using the electro-optical effect or Pockels effect, and several measurements are realized. Simulations are performed with the finite element method (FEM) to optimize the sensing medium of the device. Experimental and simulation results are presented and discussed. The sensor induces a weak disturbance of the local electric field to be measured. The sensibility of the sensor is about 4 A/(kV.cm 1 ).

Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2007

Despite the lack of studies, chest physiotherapy (CPT) is widely used for newborn babies sufferin... more Despite the lack of studies, chest physiotherapy (CPT) is widely used for newborn babies suffering from bronchiolitis. The limited data regarding this technique is mainly due to the difficulties making in situ measurements during the act. In the presented study, original instrumented gloves were designed and realized to perform measurements on babies during the CPT act. Custom-designed associated electronics and software were specially developed to monitor and record the forces applied by the physiotherapist's hands on the infant's chest and their trajectories. A prospective study, with babies in real situation, validates the principle measurement. Measurements with the system was led on babies in a referent physiotherapist consulting room between January and March 2007. The results are being analyzed and typical phases of the CPT act are highlighted.

Currently, constraint-free realistic context training is nonexistent in infant physiotherapy. In ... more Currently, constraint-free realistic context training is nonexistent in infant physiotherapy. In order to enhance the vocational learning of novices, in close collaboration with expert physiotherapists, we designed an innovative simulator dedicated to the training of infant respiratory physiotherapy. This paper describes the simulator's functionalities and the method used to design its physical structure and the learning paradigm. Firstly, regarding a cognitive approach, relevant vocational and didactic criteria were defined in order to characterize the gesture and determine its limits for a nondangerous practice. Subsequently, we chose physical parameters to assess the criteria and define the specifications of the simulator. The mechatronic functions arose from a didactic transposition of the expected simulationbased functionalities. A 6-month-old infant torso physical structure has been designed with the use of finite element simulations. Its mechanical behaviour provides the possibility to deform the mannequin like a real infant during physiotherapy manoeuvres. A prototype has been realized and validated.

2014 10th France-Japan/ 8th Europe-Asia Congress on Mecatronics (MECATRONICS2014- Tokyo), 2014

Proceedings of the 2000 IEEE/EIA International Frequency Control Symposium and Exhibition (Cat. No.00CH37052), 2000

ABSTRACT

2012 9th France-Japan & 7th Europe-Asia Congress on Mechatronics (MECATRONICS) / 13th Int'l Workshop on Research and Education in Mechatronics (REM), 2012

ABSTRACT Semi active devices to modify the stiffness or the damping of systems received significa... more ABSTRACT Semi active devices to modify the stiffness or the damping of systems received significant attention in the recent years. In this paper, two solutions of a variable compliance device to change the physiotherapists feeling of the thorax compliance of a 6-month old infant torso training simulator are presented. A first solution, using a variable orifice device which allows to change the compliance by changing the radius of a flow pipe is proposed. Another solution is to use a magnetorheological fluid damper. Both systems are presented in detail and discussed especially for their applicability to be integrated in the simulator.

The 12th IEEE International Conference on e-Health Networking, Applications and Services, 2010

ABSTRACT Chest physiotherapy is widely used for newborn babies suffering from bronchiolitis, desp... more ABSTRACT Chest physiotherapy is widely used for newborn babies suffering from bronchiolitis, despite the lack of studies regarding the technique. Qualitative protocols for Chest Physiotherapy technique have been established but no quantitative definition has been made to prove the efficiency or to characterize the gestures. Thus, with the growth in demand for training from the physiotherapy's community, we have decided to quantitatively characterize the gesture in order to enhance learning. So, an instrumented device has been implemented, in order to measure the relevant parameters that have been defined for an efficient gesture during the act. Moreover, as far as education is concerned, courses are mainly academic and the need of a realistic tool for learning seems to be essential to propose a didactic learning to physiotherapist students. Using such a realistic tool would allow the student to feel the limits of his gesture, before performing it on a baby. In the present study, we explain the approach we defined in close collaboration between expert physiotherapists and researchers in instrumentation, in order to design a torso simulator for learning. Its functionalities, expected by the practitioners have to be translated in terms of mechatronical functions to define the specifications. Last, the design of the structure is described.

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Studies in Mechanobiology, Tissue Engineering and Biomaterials, 2012

In-vivo characterization of soft tissue is a key step towards accurate biomechanical simulation e... more In-vivo characterization of soft tissue is a key step towards accurate biomechanical simulation enabling planning and intra-operative assisted surgery. This chapter presents the new version of LASTIC, a device measuring soft tissue deformations using a negative pressure. Its capabilities are compared with standard tensile tests on five samples with different elastic properties, i.e Young modulus, from 10 kPa to 1 MPa, in order to estimate its accuracy and define the functional measurement range. Results show that LASTIC overestimates Young modulus by an average of 24 % compared to the tensile devices. This error, although rather large, allows a first estimation of the elastic modulus of different materials, especially living tissues, even during surgery. Directions for improvements are given that will allow for better patient-specific biomechanical simulations of soft tissues.

Sensors and Actuators A: Physical, 2004

ABSTRACT The present study concerns an optical device measuring electric field by using a lithium... more ABSTRACT The present study concerns an optical device measuring electric field by using a lithium niobate (LiNbO3) crystal as the sensing medium, without any electrodes. Such a device has the advantage of providing a good galvanic insulation of materials and persons. A likely application is the high electric field measurement near electric power installations (frequency 50–60 Hz). The principle of measurement implements the electro-optic effect in the crystal. The sensing medium has been designed—thanks to finite element simulations—and a probe prototype constructed, with which measurements can be made far away through optical fibers. Experimental setups are developed in order to validate the physical principle, and also to calibrate the probe. As simulation results are in good agreement with experimental results, the behavior of the probe in a real environment is presented. Finally, the use of the probe to detect ice accretion on high power electric cables is proposed and validated.

Applications of Optical Fiber Sensors, 2000

ABSTRACT The conventional measurement systems for low frequency (50 - 60 Hz) high electric fields... more ABSTRACT The conventional measurement systems for low frequency (50 - 60 Hz) high electric fields measurement currently lay on active metallic probes which can disturb the measured electric field. The present study concerns an optical device using a LiNbO3 crystal, which is known to be electrooptic, as sensing medium. The experimental set-up uses two electrodes to create the electric field to be measured. The principle of measurement implements the electrooptical effect in the crystal without any contacting electrode and is based on the classical static method in which the polarization of light is analyzed after going through the crystal. In order to minimize thermo-optical effects, the light beam propagates along the optical axis and the electric field is applied perpendicularly to the beam. Thanks to an excellent agreement between simulation with Finite Element Method and experiment, the shape of the crystal and its protection ring are optimized. The crystal used here has a regular octagonal section (radius #1.5 mm) and a length of 8 mm.

Smart Materials and Structures, 2011

Finite element modeling is used in this study to optimize the electromechanical behavior of 0-3 c... more Finite element modeling is used in this study to optimize the electromechanical behavior of 0-3 composites according to the material properties of their constituents. Our modeling approach considers an 'extended' 2D representative volume element (RVE) with randomly dispersed piezoelectric particles. A variable distribution of their polarization axes is also implemented because a full periodic arrangement of fillers and a unique poling orientation are unrealistic in practice. Comparisons with a simpler RVE and with an analytical model based on the Mori-Tanaka approach are performed as a function of the particle concentration for the elastic, dielectric and piezoelectric homogenized properties. An optimization of the piezoelectric response of 0-3 composites according to material considerations is then computed, allowing it to be shown that the piezoelectric strain coefficient is not the only relevant parameter and that lead-free piezoelectric fillers such as LiNbO 3 and ZnO are competitive alternatives. Finally, the piezoelectric responses of 0-3 composites with different filler arrangements are quantitatively compared to 1-3 composites and to the corresponding bulk material.