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Concept

Transmission medium

Publications associées (20)

Observation of non-reciprocal harmonic conversion in real sounds

Romain Christophe Rémy Fleury, Hervé Lissek, Xinxin Guo

Reciprocity guarantees that in most media, sound transmission is symmetric between two points of space when the location of the source and receiver are interchanged. This fundamental law can be broken in non-linear media, often at the cost of detrimental i ...

2023

On the reconstruction of the attenuation function of a return-stroke current from the Fourier Transform of finite-duration measurements

Farhad Rachidi-Haeri, Marcos Rubinstein

A correct representation of the lightning current is crucial when the electromagnetic field radiated to a point of interest has to be computed. Based on the engineering models of Transmission Line type, such representation involves the knowledge of the ret ...

2022

Na3V2(PO4)(3)-Supported Electrospun Carbon Nanofiber Nonwoven Fabric as Self-Standing Na-Ion Cell Cathode

Jürgen Brugger, Lorenzo Lucherini, Jacopo Celè

Sodium-ion technology is a reliable alternative to lithium-ion for large-scale energy storage because of the abundance of sodium sources and related low cost. In this work, we report about a simple fabrication of self-standing electrodes based on electrosp ...

2020

High spatial resolution and intrinsically strain-insensitive distributed temperature sensing based on stimulated Brillouin scattering in gas

Luc Thévenaz, Flavien Gyger

Temperature/strain cross sensitivity is a long-standing issue in Brillouin-based distributed sensors, impairing the reliability of such sensors. So far, all the proposed methods perform the discrimination by measuring two quantities showing distinct respon ...

SPIE2019

Multi-directional emission and detection of spin waves propagating in yttrium iron garnet with wavelengths down to about 100 nm

Dirk Grundler

We performed broadband spin-wave spectroscopy on 200 nm thick yttrium iron garnet containing arrays of partially embedded magnetic nanodisks. Using integrated coplanar waveguides (CPWs), we studied the excitation and transmission of spin waves depending on ...

AIP American Institute of Physics2018

Structured transparent low emissivity coatings with high microwave transmission

Andreas Schueler, Luc Burnier, Olivia Valérie Charlotte Bouvard

In order to reduce the energy consumption of buildings, modern windows include metal-containing coatings. These coatings strongly attenuate the microwaves used for mobile communications. Here, we present a novel approach to improve radio signal transmissio ...

Springer Verlag2017

Using Electromagnetic Time Reversal to Locate Faults in Transmission Lines: Definition and Application of the Mirrored Minimum Energy Property

Farhad Rachidi-Haeri, Mario Paolone, Reza Razzaghi, Zhaoyang Wang

This paper presents an application of the Electro-magnetic Time Reversal (EMTR) in changing media to identify the fault location along a single-conductor transmission line. It is shown that the time-reversed quantities exhibit a property, called Mirrored M ...

2017

Assessment of the Influence of Losses on the Performance of the Electromagnetic Time Reversal Fault Location Method

Farhad Rachidi-Haeri, Mario Paolone, Gaspard Lugrin, Reza Razzaghi

Electromagnetic time reversal (EMTR) has been shown to be an efficient method for locating faults in AC and DC power grids. In the available literature, the back-propagation medium has been considered to have identical losses as the direct-time medium. How ...

Institute of Electrical and Electronics Engineers2017

Distributed photothermal spectroscopy in microstructured optical fibers: towards high-resolution mapping of gas presence over long distances

Luc Thévenaz, Kenny Hey Tow

Chemical sensing using optical fibers is often challenging, as it is generally difficult to achieve strong interaction between the guided light and the analyte at the wavelength of interest for performing the detection. Despite this difficulty, many scheme ...

Optical Society of America2017

Fast Simulation of Electromagnetic Transients in Power Systems : Numerical Solvers and their Coupling with the Electromagnetic Time Reversal Process

Reza Razzaghi

The development of modern and future power systems is associated with the definition of new approaches for their simulation, control, and protection. To give an example, the increasing connection of massive renewable energy conversion systems is justifying ...

EPFL2016

In Situ Hall Effect Monitoring of Vacuum Annealing of In2O3:H Thin Films

Monica Morales Masis

Hydrogen doped In2O3 thin films were prepared by room temperature sputter deposition with the addition of H2O to the sputter gas. By subsequent vacuum annealing, the films obtain high mobility up to 90 cm(2)/Vs. The films were analyzed in situ by X-ray pho ...

MDPI2015

Methods and apparatus for imaging with multimode optical fibers

Ioannis Papadopoulos, Demetri Psaltis, Christophe Moser, Salma Farahi

A multimode waveguide illuminator and imager relies on a wave front shaping system that acts to compensate for modal scrambling and light dispersion by the multimode waveguide. A first step consists of calibrating the multimode waveguide and a second step ...

2015

Dynamic control of light transmission through multimode fibers

Ioannis Papadopoulos

In the present thesis we demonstrate how under the appropriate dynamic control of light propagation, multimode fibers can be transformed into deterministic optical elements that along with their ultrathin size, large number of degrees of freedom and high N ...

EPFL2014

Single frequency wireless power transfer and full-duplex communication system for intracranial epilepsy monitoring

Catherine Dehollain, Gürkan Yilmaz

Current clinical neural recording methods which employ wired connections to the external world can be improved by eliminating the wires thanks to integrated circuit and microsystems technology. This study presents design and implementation of such a system ...

Elsevier2014

A New Set of Electrodes for Coaxial Quarter Wave Switched Oscillators

Farhad Rachidi-Haeri

We present a new profile for the electrodes forming the radial transmission line of a switched oscillator (SWO). The profile is formed using a curvilinear orthogonal space based on a specific 2-D transformation called logarithmic-tangent. The proposed prof ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Plasmon Nanomechanical Coupling for Nanoscale Transduction

Tobias Kippenberg

We demonstrate plasmon-mechanical coupling in a metalized nanomechanical oscillator. A coupled surface plasmon is excited in the 25 nm wide gap between two metalized silicon nitride beams. The strong plasmonic dispersion allows the nanomechanical beams the ...

American Chemical Society2013

Obliquely incident wave propagation across rock joints with virtual wave source method

Jian Zhao, Jianbo Zhu

Due to the presence of joints, waves are greatly attenuated when propagating across rock masses. Zhu et al. (2011) (Normally incident wave propagation across a joint set with virtual wave source method. J. Appl. Geophys.73, 283-288.) studied normally incid ...

Elsevier2013

Example of data telemetry for biomedical applications: an in vivo experiment

Juan Ramon Mosig, Anja Skrivervik, Jean-François Zürcher, Yann Barrandon, Benjamin Fuchs, Francesco Merli, Benjamin Fuchs, Eric Meurville, Léandre Bolomey, François Gorostidi

This letter describes a data telemetry biomedical experiment. An implant, consisting of a biometric data sensor, electronics, an antenna, and a biocompatible capsule, is described. All the elements were co-designed in order to maximize the transmission dis ...

Institute of Electrical and Electronics Engineers2012

Correcting spherical aberrations induced by an unknown medium through determination of its refractive index and thickness

Pramod Rastogi

In imaging and focusing applications, spherical aberration induces axial broadening of the point spread function (PSF). A transparent medium between lens and object of interest induces spherical aberration. We propose a method that first obtains both the p ...

Optical Society of America2011

The Vibrating Body Transistor

Mihai Adrian Ionescu

This paper presents a hybrid resonator architecture called the vibrating body field-effect transistor (VB-FET), which combines a silicon microelectromechanical (MEM) resonator and a FET in a single device. The active device provides improved motion sensing ...

2011