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August 30, 2018 | More accurate identification of volatile compounds

List composes volatils
© monsitj -

The performance of systems used to identify volatile compounds has been enhanced substantially thanks to research conducted under the Essaim project. Improvements were made to both the sensors and the data acquisition and processing methods.

Functionalized surface acoustic wave (SAW) sensors identify volatile compounds by detecting variations in the resonance frequency the compounds generate when they are adsorbed at the sensors' surface. In research conducted under the Essaim project, List, a CEA Tech institute, developed new SAW sensors and a multi-sensor method capable of obtaining a more specific "signature" than conventional SAW approaches.

Until now, organic compounds have been identified solely based on variations in the sensors' resonance frequency. The new method uses a representation of the data based on the equations that govern the sensors' physical parameters. The method, which is more complex, makes it possible to acquire more accurate variables. The characteristics extracted using the method resulted in classification rates in excess of 96% on test databases—an improvement of more than 7% in some cases. The new method can identify compounds and determine how many compounds are in a mix to generate a concentration profile.

The method could be of use for a variety of applications, from detecting toxic chemicals to controlling the quality of food. It was tested on different types of coffee with a success rate of 75%, compared to 62% previously in the best cases. The software is fully automated, making it usable even by non-specialists. All of these improvements have been integrated into PACT.

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




June 28, 2018 | Toward more effective dose control in electronic brachytherapy

curietherapie 250
© weyo - Fotolia

A dosimetric reference was developed to more effectively control doses administered to breast cancer patients receiving electronic brachytherapy treatment.

The use of intraoperative electronic brachytherapy to treat breast cancer is on the rise. The treatment presents a number of benefits, especially in terms of patient comfort and cost. The INTRABEAM® system by Zeiss is the only system used in France, where it is available in around a dozen hospitals.

The system uses low-energy X-rays generated by miniature tubes whose ends are fitted with sphere-shaped applicators sized to fit the surgical cavity left after the tumor is removed. The device delivers targeted, localized radiation.

On the recommendation of the French National Authority for Health, LNHB, France's national metrology laboratory for ionizing radiation and a laboratory of CEA Tech institute List*, established a dosimetric reference for the INTRABEAM® system independent of the reference provided by the manufacturer. The researchers used a conventional X-ray generator to reproduce the beam emitted by the system's source associated with a sphere-shaped applicator. The dose delivered by the beam was measured, and it can now be used to calibrate detectors, in turn enabling hospital staff to calibrate the source used in treatment.

The reference established must now be compared with the reference of another metrology lab for validation. This new method for controlling the dose administered to patients could then be used for other existing intraoperative radiotherapy systems (Xoft Axxent System, Esteya, SRT-100 TM, Papillon, etc.).

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




25 juin 2018 | Paris-Region Smart Robotics Day

bandeau robotics

List logo invit

Valérie Pécresse
Présidente de la Région Île-de-France

Alexandra Dublanche
Vice-présidente en charge du développement économique,
de l’agriculture et de la ruralité


Philippe Watteau
Directeur du CEA List

ont le plaisir de vous inviter au Paris Region Smart Robotics Day

Lundi 25 juin 2018 à 13h30
La Région Île-de-France rassemble sur son territoire un écosystème particulièrement foisonnant en robotique et intelligence artificielle. En juin 2017, elle a lancé Smart Industrie, une initiative ambitieuse pour structurer cet écosystème et impulser la transformation numérique de l’industrie francilienne. La création du Digital Innovation Hub DIGIHALL en est une illustration emblématique : il permettra d’accompagner plus efficacement les entreprises dans leur démarche de différentiation et d’ouverture au marché européen de l’innovation.
Venez découvrir de nouvelles opportunités
pour votre entreprise !
Conseil régional d’Île-de-France
2 Rue Simone Veil, 93400 Saint-Ouen
Métro : Ligne 13, station Mairie de Saint-Ouen
bouton inscription 03

June 12, 2018 | CIVA now includes infrared thermography

CIVA List 250
© joyfotoliakid - Fotolia

CIVA, the world's leading simulation software for non-destructive testing (NDT), now has an infrared thermography module, rounding out the software's existing X-ray, ultrasonic, and electromagnetic wave inspection modules.

Infrared thermography can generate images of thermal anomalies in a structure or part, making it useful in a number of fields, including non-destructive testing (NDT) and, in particular, the inspection of composites, plastics, and certain metals. For metals, infrared thermography is a good alternative to other methods like penetrant testing (PT), commonly employed in the aeronautics industry. PT requires highly toxic substances, making it much more polluting than infrared thermography.

In research conducted under the CIVATHERM project run in partnership with the Bordeaux Institute of Mechanics and Engineering, List, a CEA Tech institute, developed the first-ever infrared thermography simulation module and integrated the module into its CIVA software. The module, called CIVA IT (Infrared Testing), leverages several thermal camera models and can rapidly generate thermograms comparable with those acquired in lab conditions. It can be used to simulate the inspection of flat, multi-layered materials containing heterogeneous areas.

Numerical and semi-analytical simulation tools are also under development, with the ultimate goal of adding new part geometries to the modules and diversifying the excitation sources. The initial results of induction thermography simulations were presented at the 2017 ENDE Workshop (

*List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).




May 31, 2018 | Measuring racecar noise

voiture course 250
© Viktor Gmyria, © Philippe BERNARD Fotolia

Signal analysis methods were used to measure noise during auto races in order to assess environmental impacts and standardize measurement.

Are auto races really too noisy? Faced with mounting environmental pressure, the FIA (Fédération Internationale de l'Automobile) turned to CETIM[1] to find out by measuring the noise generated by racecars. However, the method developed, which consisted of measuring the decibels emitted by racecars as they passed through an archway equipped with microphones, came up short in terms of separating out the noise of two cars very close to each other. CETIM asked List[2], a CEA Tech institute, to solve the problem.

The researchers began by acquiring reliable data. They ran test campaigns on three go-carts equipped with microphones, accelerometers, and an embedded GPS sensor in addition to the twelve microphones on the archway. They studied more than a hundred passes through the archway with the go-carts in various positions with regard to each other.

The time it took the go-carts to pass through the archway was estimated using ultrasonic measurement followed by an analysis of the overall space-time profile (the sum of individual measurements) to determine each vehicle's noise emissions, regardless of the distance between vehicles.

The measurements were accurate to within less than a decibel. The "separation" algorithm, which can unambiguously identify vehicles that are too noisy, could also be used in other areas, like submarine acoustics, without major modifications.

[1]CETIM: Centre technique des industries mécaniques

[2]List earned the prestigious Institut Carnot seal in 2006 (Institut Carnot TN@UPSaclay).