Julien Dupuy

Julien Dupuy
Multitel · Department of Applied Photonics

Master of Engineering

About

19
Publications
1,403
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
56
Citations
Additional affiliations
January 2014 - November 2021
Multitel
Position
  • Group Leader

Publications

Publications (19)
Article
The purpose of this paper is to study the impact of surface laser treatments with ultra-short pulses (Femtosecond laser) on the magnetic properties of Grain Oriented Electrical Steels (GOES) using the two-temperature model for the ablation process1, 2 and the magnetic loss separation model of Bertotti. We demonstrated that the hysteresis and excess...
Article
Full-text available
Improving the performance of electrical steels within the magnetic circuits is essential to save energy. The domain refinement through local surface treatment by laser is an effective technique to reduce the iron losses in grain-oriented iron silicon steels. To interpret the mechanism of this technique, we have quantitatively studied the impact of...
Conference Paper
Laser Induced Periodic Surface Structuring (LIPSS) is a powerful tool for creating sub-micrometric features on large surfaces in an up-scalable and industrial way. In order to control the process and reach a sufficient uniformity for some applications a careful attention must be paid to the control of the laser beam parameters like its polarization...
Poster
Full-text available
Grain-oriented electrical steel sheets constitute the main core of electrical power transformers and generators. Manufacturers seek to improve the performance of these magnetic components and to save energy. Using the technique of domain refinement by local laser treatment on the surface of grain-oriented electrical sheets showed effective results...
Article
Electromagnetic components mostly incorporate soft magnetic materials used as flux multipliers. Hence, any reduction in iron loss of the magnetic core yields in saving energy. Among the techniques, the local laser treatment is a non-contact method applied for 180° domain refinement [1]. The present study reassessed the impact of laser treatment on...
Article
Surface laser treatment of soft magnetic materials, such as GO SiFe electrical steels, is mainly used to reduce iron losses by modifying the static and the dynamic magnetic properties. Laser treatment effect on mesoscopic electromagnetic properties of soft magnetic materials is presented. An experimental procedure using the Single Sheet Tester is p...
Conference Paper
Grain-oriented elctrical steel is generally used in electrical machines like transformers. Laser surface treatment of such materials mainly used for iron losses reduction may also reduce noise and vibration due to magnetostrictive loads reduction. Surface laser treatment supplies additional stresses that changes the domain structure's configuration...
Conference Paper
In this paper we investigated the impact of laser treatment on the magnetic performance of grain-oriented Silicon Iron SiFe sheets using an IPG Ytterbium nanosecond fiber laser. We presented the loss and apparent permeability measurements of work sheets for different laser configurations. A loss reduction rate between 28% and 56% was verified at hi...
Article
This paper analyses the implementation of fibre Bragg grating (FBG) sensors as vibration sensors along a rail in order to obtain usable signals of sufficient interest for weigh-in-motion and axle counting. Particular attention is also paid to the advantages of these new sensors. This study was completed by numerical analysis of the stress transfer...
Article
Structural health and operation monitoring are of growing interest in the development of railway networks. Conventional systems of infrastructure monitoring already exist (e.g. axle counters, track circuits) but present some drawbacks. Alternative solutions are therefore studied and developed. In this field, optical fiber sensors, and more particul...
Conference Paper
Due to their high mechanical and corrosion resistance, low signal attenuation, optical fiber sensors and more particularly fiber Bragg gratings (FBGs) have demonstrated their high potential in various sensors applications such as health monitoring of structural pieces when their are placed under constrain, vibration or temperature variation. In thi...

Network

Cited By

Projects

Projects (2)
Project
Nanostructuring metal surfaces with the help of ultra-short pulse laser to improve their properties (dental implants, linear encoders, batteries). www.laser4surf.eu
Project
Electrical Steel Structuring, insulating and Assembling by means of the Laser technologies https://www.essial.eu/en/home