Luc Chassagne - Academia.edu (original) (raw)

Papers by Luc Chassagne

2019 6th International Symposium on Electrical and Electronics Engineering (ISEEE)

Optical Wireless Communications are emerging as promising alternative to radiofrequency and micro... more Optical Wireless Communications are emerging as promising alternative to radiofrequency and microwave communications in order to respond to the increasing demand for data transfer and to the expanding area of wireless applications. In this context, this paper provides a short overview of OWC technologies and focuses on their usage in automotive applications. Thus, vehicular Visible Light Communications and Visible Light Ranging systems recently developed by our research groups are presented in order to set the path toward designing a mixed visible light communications and ranging system for automotive applications based on standard car lighting system.

2019 2nd IEEE International Conference on Soft Robotics (RoboSoft)

Conducting interpenetrating polymer networks (C-IPN) are suitable to sense and actuate with the s... more Conducting interpenetrating polymer networks (C-IPN) are suitable to sense and actuate with the same material, having great potential for applications in soft sensors and soft actuators at macro- or microscale. In this paper, an integrated cantilever consisting of two C-IPN demonstrates the performance of a self-sensing actuator. The sensing output of the structure is analyzed to predict its actuation. Moreover, a compensation method is proposed to balance the current leakage for quasi-static measurement.

This work concerns the field of the dimensional nanometrology, more particularly dedicated to pos... more This work concerns the field of the dimensional nanometrology, more particularly dedicated to positioning and displacements of mechanical stage on millimetre ranges. One will find details concerning the original methods developed at the laboratory, associating mechanical precision, optical sensors and high-frequency electronics which enabled to obtain many experimental results in this field. We are pointing out two spheres of activities more particularly. The first relates to the displacement of a carry-sample stage for applications in partnership with near-field microscopy and lithography where it is necessary to carry out millimetre-length displacements in a plan with repeatabilities of about one nanometer. The second relates to the balance of watt of the Laboratoire National d'Essai where it is necessary to move a mass along an axis at uniform 2 mm.s-1 with an accuracy of 10-9 in relative value.Ces travaux portent sur le domaine de la nanométrologie dimensionnelle, plus parti...

Electronics

One of the most critical challenges in vehicle-to-vehicle (V2V) visible light communications (VLC... more One of the most critical challenges in vehicle-to-vehicle (V2V) visible light communications (VLCs) is the access capability of multi-users over the same channel. VLC links are known to be line of sight (LOS) and highly directional compared to the commonly used radio-frequency (RF) technologies, but multi-user interference can still be problematic. Consequently, it is necessary to develop a medium access control (MAC) protocol for VLC. In the present work, we propose a novel optical code division multiple access (OCDMA) protocol. The fundamentals of the VLC channel are presented, and the interference problem is discussed in more detail. We also explain the CDMA MAC protocol and its adaptation from optical fiber communications. The simulations with our OCDMA protocol based on pseudo-noise (PN) sequence codes are presented, and the results are compared with those obtained using a solution based on VLC and optical orthogonal codes (OOCs) from the OCDMA gold standard. Finally, the resul...

2016 IEEE SENSORS, 2016

This paper presents a novel design of an acousticwave liquid ejector by using PDMS soft-lithograp... more This paper presents a novel design of an acousticwave liquid ejector by using PDMS soft-lithography. Both annular patterned lens membrane and piezoelectric transducer are designed to be replaceable to avoid ink clogging on the ejector surface. With the integration of an external siphoning system, the ejector is capable of jetting downward rather than only upward and refilling ink automatically without external force, which makes it suitable for 3D printing applications. By applying the electric signal at 2.4 MHz, the ejector can eject water downward with a speed of 0.29 m/s and droplet dimension of 720 m.

2017 IEEE International Conference on Robotics and Automation (ICRA), 2017

This work deals with a Conducting-Interpenetrating Polymer Network (C-IPN). The C-IPN exhibits ve... more This work deals with a Conducting-Interpenetrating Polymer Network (C-IPN). The C-IPN exhibits very interesting and promising properties which can make it suitable for applications in robotics as a tool to perform tasks in the fields of manipulation, grasping or force measurement. It is known in the literature that such C-IPN may be actuated and bended to interact with other objects. Some of them can also be used as sensors to characterize the interaction. In this paper, we show that actuation and sensing can be performed at the same time. Moreover, we propose analytical models which can be useful for future work to process the C-IPN output and to control them. All results are verified with experimental data.

Journées Nationales Nanosciences et Nanotechnologies 2011, 2011

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

2017 New Generation of CAS (NGCAS), 2017

In the context of an increasing preoccupation to reduce the number of road accidents, wireless co... more In the context of an increasing preoccupation to reduce the number of road accidents, wireless communications have been identified as a promising solutions in this area. This paper presents the simulation results for a Visible Light Communications (VLC) sensor envisioned for vehicular communication applications. Since the outdoor VLC channel can be affected by multiple noise sources, numerical filters and digital signal processing techniques are used as a solution to increase the robustness to noise and to enhance the sensor's flexibility. Simulations are performed in order to analyze the effect of the modulation frequency, SNR and message length on the BER.

2016 IEEE 19th International Conference on Intelligent Transportation Systems (ITSC), 2016

Vehicle positioning and environment awareness are key components in new intelligent transportatio... more Vehicle positioning and environment awareness are key components in new intelligent transportation systems (ITS) which explains the growing demand in distance sensors. Though several efficient technologies already exist, the growing automation of vehicle requires sensors redundancy. In this paper, we introduce a new, simple and low cost distance measurement scheme using the headlamps and taillights of the vehicles. The following vehicle (FV) emits a periodic signal toward the leading vehicle (LV) which receives, processes and re-emits it. The FV then exploits the phase-shift introduced by this round trip to recover the distance. A complete simulation model is built and tested. This study shows that our system is able to measure distances up to 25 meters with a resolution under 10 centimeters, and up to 30 meters with a 30 centimeters resolution, at a refresh rate of 267 Hz. Even if the regulated optical power and beam limits the range of such a system, it is particularly suited for platooning applications where vehicles are close.

Visible Light Communications (VLC) can play an important role in the Cooperative Intelligent Tran... more Visible Light Communications (VLC) can play an important role in the Cooperative Intelligent Transport Systems (C-ITS) by enabling vehicles to communicate with nearby vehicles (V2V) and infrastructure (V2I) by offering virtually unlimited and unregulated spectrum. Whereas extensive R&D efforts have been made on physical layer techniques, almost no study has been made on Multi-Users Interference (MUI), consequently Medium Access Control (MAC), in VLC. This work sheds light on the impacts of MUI on VLC performances for V2V communications. We first develop an analytical model that formulates the Packet Delivery Ratio (PDR) performances of VLC communication in presence of MUI. We then conduct simulation evaluations to confirm the analytical model and evaluate the VLC performance when there is one or more interfering nodes. The obtained results clearly show that, in an absence of MAC, VLC can suffer from MUI in medium to dense traffic density even when message generation rate at each nod...

We propose a 2D displacement control system with a sub-nanometric repeatability on position over ... more We propose a 2D displacement control system with a sub-nanometric repeatability on position over millimetre travel range on both axes. It could be useful for nanofabrication processes or other applications related to the nanotechnology community. In our case, the apparatus is planned to be used in atomic force microscopes and lithography systems as sample-holding device. The method is based on a heterodyne interferometric sensor and a home-made high frequency phase-shifting electronic board. This paper presents the complete mechanical system and gives experimental results showing repeatability of 0.5 nm over a dynamic range of 5 mm. PACS: 06.20.–f; 42.87.Bg; 06.30.Bp

2019 Global LIFI Congress (GLC), 2019

Multi-band carrierless amplitude and phase modulation ($\pmb{m}$ -CAP) is associated with subcarr... more Multi-band carrierless amplitude and phase modulation ($\pmb{m}$ -CAP) is associated with subcarrier multiplexing (SCM), multi-carrier code division multiple access (MC-CDMA) and power-domain non-orthogonal multiple access (PD-NOMA) to form novel multi-user visible light communication (VLC) schemes. The combination with MC-CDMA and PD-NOMA are explored for the first time using the pmbm\pmb{m}pmbm -CAP modulation. In order to study the associations, their performances are compared experimentally. The data rate per user, the deviation from a user's target throughput and the maximum serviceable area for different number of users are all measured in this paper. The association of PD-NOMA with SCM and pmbm\pmb{m}pmbm -CAP shows a data rate of 40.62 Mb/s per user with only 2.5 Mb/s of throughput variation in a 4-user scenario, as well as an attocell size 1.75 meter square larger than associations based on MC-CDMA.

Les systemes de geolocalisation par lumiere visible qui se deploient dans les espaces interieurs ... more Les systemes de geolocalisation par lumiere visible qui se deploient dans les espaces interieurs comme les musees, les grandes surfaces, les hopitaux et les stations de metro utilisent des lampes a LED alimentees en continu (DC). Cependant, une nouvelle gamme de lampes a LED bon marche fait son apparition. Ici nous decrivons deux techniques de la modulation de lumiere pour interieur et exterieur avec des lampes LED en mode alternatif (AC), par exemple pour des applications de geolocalisation.

2018 IEEE Photonics Conference (IPC), 2018

We want to allocate the users to the optimal subcarriers in visible light communication. Allocati... more We want to allocate the users to the optimal subcarriers in visible light communication. Allocation algorithms adapted from fiber-optic and implemented in an experimental setup attain a deviation from the bit rate target inferior to 5 percent for 11 users.

2018 Global LIFI Congress (GLC), 2018

Vehicle-to-vehicle (V2V) communication is a core brick of the smart vehicle, especially in highwa... more Vehicle-to-vehicle (V2V) communication is a core brick of the smart vehicle, especially in highway platooning configurations where it enables the lateral and longitudinal control of the vehicle trajectory. Although very attractive, the radio systems based on the IEEE 802.11p standard that are classically used for vehicular communication suffer from serious performance degradations in dense traffic scenario, especially in terms of transmission latency. Visible light communication (VLC) has thus been proposed as a complementary technology. In this work, a simple VLC system, based on commercial offthe-shelf (COTS) light-emitting diodes (LED) headlamps and taillights, is presented and tested in several configurations in order to evaluate its compatibility with platooning. It is shown that the system provides, at a data rate of 100 kbps, a bit error rate (BER) below 10 −6 up to 30 m using either the front or back lamps. In addition, the transmission latency is evaluated at 4.2 ms and it is found that a jamming vehicle overtaking the platoon would not cause any performance degradation. These results thus confirm the interest of VLC for platooning.

Réseaux Télécommunications, 2017

Le LiFi, ou Light-Fidelity, est une technologie issue des telecommunications optiques permettant ... more Le LiFi, ou Light-Fidelity, est une technologie issue des telecommunications optiques permettant de transmettre des informations par modulation d’une source de lumiere visible. Normalisee depuis 2011, et associee au deploiement intensif des LED, cette technologie presente un potentiel en termes de performances qui en fait un excellent moyen de communication complementaire des technologies radiofrequences. Les elements constituants d’une chaine de transmission LiFi se rapprochent de ceux d’une chaine d’optique fibree, avec la preoccupation de s’affranchir des conditions environnementales generant des perturbations compte tenu de la bande optique utilisee. Les applications tant internes aux bâtiments ou les LED deviennent le standard qu’en milieu urbain externe sont multiples.

Materials Research Express, 2020

The effect of Sn content on the mechanical properties and corrosion behavior of Mg-3Al-xSn alloys... more The effect of Sn content on the mechanical properties and corrosion behavior of Mg-3Al-xSn alloys was investigated by SEM-EDXS, XRD, electrochemical measurements, and scanning Kelvin probe force microscopy (SKPFM). The results showed that when the Sn content was 1.4 wt%, Sn dissolved in the α-Mg matrix and then precipitated as an intermetallic compound (Mg2Sn). The combined results of mass loss, hydrogen evolution, and electrochemical measurements indicated that Mg-3Al-1Sn had a low corrosion rate. The SKPFM results showed that the Volta potential of Mg2Sn particles, Al-Mn, and β-Mg17Al12 phases were 100, 80, and 50 mV higher than the matrix, respectively. Therefore, the Mg2Sn phase that formed in Mg-3Al-xSn served as a local cathode due to its high potential, which accelerated microgalvanic corrosion along with the secondary local cathode (Al-Mn). The Sn solution strengthening and secondary phase strengthening (fine Mg2Sn particles) improved the mechanical properties of the Mg-3Al-...

Journal of Medical and Biological Engineering, 2019

Purpose Attentiveness recognition benefits the detection of the mental state and concentration wh... more Purpose Attentiveness recognition benefits the detection of the mental state and concentration when humans perform specific tasks. Hilbert–Huang transform (HHT) is useful for the analysis of nonlinear or nonstationary bio-signals including brainwaves. In this work, a method is proposed for the characterization of attentiveness levels by using electroencephalogram (EEG) signals and HHT analysis. Methods Single-channel EEG signals from the frontal area were acquired from participants at different levels of attentiveness and were decomposed into a set of intrinsic mode functions (IMF) by empirical mode decomposition (EMD). Hilbert transform analysis was applied to each IMF to obtain the marginal frequency spectrum. Then the band powers and spectral entropies (SEs) were selected as the attributes of a support vector machine (SVM) for a two-class classification task. Results Compared with the predictive models of approximate entropy (ApEn) and fast Fourier transform (FFT), the results sh...

Journal of Physics: Conference Series, 2018

We discuss a two dimensional model that is capable of reproducing, at least qualitatively, some o... more We discuss a two dimensional model that is capable of reproducing, at least qualitatively, some of the experimentally observed features of spin-conversion compounds. The molecules of these compounds have two electronic energy levels separated by Δ. The values of the elastic constants of the springs contained in the molecules are lower in the upper level. Consequently, the crystal's phonon branches depend on the electronic states of the molecules. The fundamental level is a low spin (LS) state and the excited one is a high-spin (HS) state. We study the thermal variation of the high spin fraction, i.e., the fraction of molecules in the (HS) level by using a model of atom-phonon coupling with a boundary effect: Δ = Δb for molecules within the bulk, and Δ = Δs e < Δb for molecules on the boundary. These values are compound-dependent, but independent of the crystal's size. Our model reproduces qualitatively two seemingly contradictory experimental results as well as the disappearance and reappearance of the hysteresis loop that is observed when the number N of crystal's molecules is very small. Our model explains why the width of the hysteresis loop decreases with decreasing N. We find that for any N the crystal's entropy vanish at 0K, in accordance with the third law of thermodynamics.