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January 2013 - present
Publications
Publications (52)
Sediment transport, either in natural environment or in sewer systems is of main interest to understand river geomorphology or handle the wastewater regulation and treatment. Knowledge on Suspended Sediment Concentration (SSC) and size distribution leads to a better understanding of sediment transport dynamics. In a wide range of rivers and sewer n...
In order to monitor these phenomena, the Suspended Solids Concentration is usually measured either by ad hoc analyzes on samples or continuously by optical turbidity. We compared these conventional techniques to explain, in terms of particle presence, the variations of real time acoustic turbidity. The Ultrasonic Doppler Velocity Profiler (UVP) als...
The suspended sediment concentration (SSC) is a key element for water quality monitoring. Optical turbidity is already widely used as SSC indicator and acoustic backscattering devices are still under investigation. Recent observations on a wastewater network showed huge differences between the behaviour of optical and acoustic turbidity according t...
Knowledge on Suspended Sediment Concentration (SSC) leads to a better understanding of sediment transport dynamics, which is of main interest to understand river geomorphology or handle the wastewater regulation and treatment. For this purpose, optical and acoustic turbidity are both used to monitor continuously the suspended solids content in wate...
Environmental water monitoring requires the estimation of the suspended solids load. In this paper, we compare the concentration range accessible through three different techniques: optical turbidity, acoustic backscattering and the newly in-lab developed time resolved optical turbidity. We focus on their comparison on measurements made in the labo...
Cette étude porte sur une technologie de densification des boues appliquée à un procédé à boues activées continue. Par la combinaison d'une sélection microbienne (zone anaérobie) et physique (extraction sélective par hydrocyclones), cette technologie permet de générer une proportion significative de biomasse sous forme granulaire, améliorant ainsi...
Au sein des filières de traitement des eaux usées utilisant le procédé conventionnel à boues activées, les propriétés de décantation des boues au sein du clarificateur secondaire sont susceptibles d’être dégradées, notamment lors de phénomènes de prolifération de bactéries filamenteuses. Cette étude vise à caractériser la décantation de boues obten...
Conventional activated sludge (CAS) and densified sludge obtained using hydro-cyclone selective wasting were compared at a full-scale water resources recovery facility. The densified tested sludge, containing around 30–50% of aerobic granules, showed enhanced settleability with low and stable sludge volume index (SVI) compared to CAS, which suffere...
The knowledge of sediment transport characteristics is an important issue in terms of sewer and surface water management. In order to monitor these phenomena in sewage, the Suspended Solids Concentration (SSC) is usually measured either by ad hoc analysis on samples or by optical turbidity which is the most commonly used continuous measurement tech...
This paper focuses on the use of the raw acoustical turbidity and velocity data as a flow online monitoring tool. Its aim is to demonstrate that, with adequate instrumental settings, interesting results can directly be seen on the raw data. As illustration, some experimental results on a combined acoustic turbidity and velocity analysis on a river...
This paper focuses on the use of acoustic turbidity as an online monitoring tool. Some experimental results on river and sewer network are shown. The river data analysis demonstrates the great potential of the acoustic measurements in sediment transport studies. The sewer data shows different application as suspended sediments concentration or wate...
The potential of the acoustic measurement is currently not sufficiently exploited in the context of the monitoring of urban wastewater. The decomposition of the acoustic signal indicates that the acoustic turbidity is sensitive to the nature of the suspended particles and their concentrations. So the acoustic characteristics (form function and tota...
This paper presents a collaborative study of the Universities of Strasbourg and Hokkaido with the support of Ubertone. Its goal is to analyze and understand the ultrasound wave behavior at the water-air boundary. Measurements with an Ubertone UB-Flow profiler have been done for different water height and discharge configurations on a flume of 16 me...
This work describes the ultrasound approach for measuring settling velocities of wastewaters. The method is tuned starch particles, good representatives of the organic matter in wastewater. A comparison of starch settling velocity and real wastewater settling velocity obtained by ultrasounds with the same measurements obtained by the standard proto...
Wastewater regulation and treatment is still a major concern in planetary pollution management. Some pollutants, referred to as particulate matter, consist of very small particles just suspended in the water. Various techniques are used for the suspended particles survey. Few of them are able to provide real-time data. The development of new, real...
Apres un rappel sur l'effet Doppler, les principes courants de mesure de vitesse utilisant les ondes ultrasonores seront rapidement presentes. Cet article se focalisera ensuite sur la methode de mesure utilisant les ondes ultrasonores pulsees, qui presente notamment l'avantage de pouvoir mesurer un profil de vitesses. Plusieurs techniques d'estimat...
In the frame of a technological research and innovation network in water and environment technologies (RITEAU, Réseau de Recherche et d'Innovation Technologique Eau et Environnement), our research group, in collaboration with industrial partners and other research institutions, has been in charge of the development of a suitable flowmeter: an ultra...
After a short description of the Doppler effect, common principles usedfor velocity measurements by ultra-sound will be explained. Afterwards, thispaper will focus on the pulsed beam method which allows velocity profilecharacterization. Several estimation techniques might be used to extract thevelocity information from the raw data. Distinction is...
Modern sewer systems are subject to increasingly stringent water policy laws. For wastewater management, important parameters are flow rates and pollutant loads conveyed in sewers. Precise knowledge of pollutant fluxes thus requires a better assessment of both the velocity and suspended matter fields. The aim of our work is an experimental characte...
The Compact Muon Solenoid (CMS) detector is described. The detector operates at the Large Hadron Collider (LHC) at CERN. It was conceived to study proton-proton (and lead-lead) collisions at a centre-of-mass energy of 14 TeV (5.5 TeV nucleon-nucleon) and at luminosities up to 1034 cm−2 s−1 (1027 cm−2 s−1). At the core of the CMS detector sits a hig...
In all measurement techniques one seeks accuracy and precision. In ultrasonic Doppler velocimetry, those qualities strongly depend on signal to noise ratio of the Doppler signal and on the performance of the velocity estimator. The most widely used estimation method in ultrasonic coherent Doppler velocimetry is the pulse pair method. Its success is...
L'un des problèmes rencontrés en gestion des eaux usées est la mesure des flux de
polluants. Dans le cadre d’un projet RITEAU, l’IMFS développe un fluxmètre en
collaboration avec les industriels IRH Environnement et ULTRAFLUX, le laboratoire
CRAN et l’ENGEES. L’objectif de l’étude est de développer un dispositif ultrasonore
en réseau d’eau pour la...
L'un des problèmes rencontrés en gestion des eaux usées est la mesure des flux de polluants. Dans le cadre dun projet RITEAU, débuté en juillet 2003, lIMFS développe un fluxmètre en collaboration avec les industriels IRH Environnement et ULTRAFLUX, le laboratoire CRAN et lENGEES. Lobjectif de létude est de développer un dispositif ultrasonore...
A wedge-shaped Micromegas detector has been tested with a fast integrated electronics (PREMUX128). Due to the large capacitance of this detector, special care has been taken to protect electronics from possible streamers in the signal collection area; a study of the discharge mechanism is reported here. The signal-to-noise, spatial resolution and e...
The ANTARES collaboration has performed a series of in-situ measurements to study the background light for a planned undersea neutrino telescope. Such background can be caused by decays or by biological activity. We report on measurements at two sites in the Mediterranean Sea at depths of 2400 m and 2700 m, respectively. Three photomultiplier tubes...
In order to check the system aspects of the forward–backward MSGC tracker designed for the future CMS experiment at LHC, 38 trapezoidal MSGC counters assembled in six multi-substrates detector modules were built and exposed to a muon beam at the CERN SPS. Results on the gain uniformity along the wedge-shaped strip pattern and across the detector mo...
This document presents the scientific motivation for building a high energy neutrino undersea detector, with an effective area of 0.1 km
We report on the construction and first test beam results of a prototype of two-stage amplifying detector module with four trapezoidal elements arranged in a geometry as planned for the CMS forward tracker. The performance of the detector is studied for different operational parameters in a high energy pion beam at CERN. a) corresponding author; em...
The ANTARES Collaboration proposes to construct a large area water Cherenkov detector in the deep Mediterranean Sea, optimised for the detection of muons from high-energy astrophysical neutrinos. This paper presents the scientific motivation for building such a device, along with a review of the technical issues involved in its design and construct...
The trigger for the first compact muon solenoid (CMS) tracking
beam tests is a dedicated system for analog multiplexed front-end
electronics. With this first generation of electronics dedicated to CMS
tracker detectors, some new specific development was necessary to read
it with a multicrate distributed data acquisition (DAQ) system. The goal
of th...
The distributed data acquisition (DAQ) system developed by the
GRPHE (Groupe de Recherche en Physique des Hautes Energies) group is a
combination of hardware and software dedicated to high energy physics.
The system described here is used in the beam tests of the CMS tracker.
The central processor of the system is a RISC CPU hosted in a VME card,
r...
The aim of this work was to quantify the influence of radiation-induced substrate defects on microstrip gas chamber (MSGC) gain behaviour. The first part of this paper focuses on radiation effects on a typical MSGC substrate: Desag D263 glass. Defect generation was studied for Desag D263 with pure silica (Suprasil 1) as a reference. We studied the...
We report on the construction and test beam results of a MSGC detector module with four trapezoidal elements arranged in a geometry as planned for the CMS forward tracker. Our objective is to study a concept for the forward detector modules which is easy to build with minimal contribution to the material budget. Signal to noise ratio and spatial re...
The ANTARES project is an international collaboration with the aim of building a deep-sea large area neutrino telescope within the next decade. The achievements and status of the project as at the time of the conference are briefly discussed, and short term steps as well as longer term plans are described.
The trigger of the first CMS tracking milestones is a dedicated system for analog multiplexed front end electronics. With this first generation of electronics dedicated to CMS tracker detectors, some new specific development was necessary for its coupling with a multi-crate distributed DAQ 1) system. The goal of this development was to reach a high...
During the beam test of a tracker prototype for the Compact Muon Solenoid detector proposed for the LHC, the time response of the Microstrip Gas Chambers was studied using different gases and chamber gaps. The subsequent efficiency to identify the bunch crossing at LHC is discussed for several algorithms used in the off-line signal processing of th...
A prototype of the barrel Tracking Detector of the Compact Muon Solenoid (CMS) experiment proposed for LHC was built and tested in a beam and in a magnetic field of up to 3 T. It contained six microstrip gas chambers, 25 cm long, and three double-sided silicon microstrip detectors, 12.5 cm long. We report some preliminary results on the performance...
We have studied the performance of several Microstrip Gas Chamber (MSGC) prototypes made on standard Desag D263 boron implanted glass. The purpose of the implantation is to reduce the surface resistance. The long term stability of this implantation has been measured under applied bias voltage. Comparative tests have been carried out on prototypes m...
Damages to MSGCs induced by discharges have been investigated. Optimization of electrode shapes and/or deposition of a protective coating allows the increase of the potential difference between anode and cathode, thus increasing the gain.For prototypes of MSGCs made at the Centre de Recherches Nucléaires, each step of the manufacturing processes wa...
Real-time sewer networks survey becomes a major key in wastewater regulation. Needs for continuous and precise information, especially in wastewater discharge, increase in importance. In the frame of a technological research and innovation network in water and environment technologies (RITEAU), our research group, in collaboration with industrial p...
Wastewater regulation and treatment is still a major concern in planetary pollution management. Some pollutants, referred to as particulate matter, consist of very small particles just suspended in the water. Various techniques are used for the suspended particles survey. Few of them are able to provide real-time data. The development of new, real...
Nous présentons dans cet article un algorithme pour la mesure des profils de vitesse dans un écoulement chargé par lutilisation dondes ultrasonores pulsées. La méthode employée se base sur lestimation de la différence du temps daller-retour de londe émise dune période démission à lautre par intercorrélation des signaux fenêtrés correspondan...
