Publications de Peter Ryser | EPFL Graph Search

Optimisation of industrial production of low-force sensors – adhesive bonding of force-centring ball

Thomas Maeder, Peter Ryser, Caroline Jacq, Maxime Blot

This work addresses the issue of attaching the force-centring part (a round ball) to the load cell of a force sensor, a piezoresistive thick-film Wheatstone bridge deposited onto a ceramic cantilever. As the current soldering process requires expensive met ...

IOP2015

Enclosed Electronic System for Force Measurements in Knee Implants

Kamiar Aminian, Philippe Renaud, Arnaud Bertsch, Peter Ryser, Eric Meurville, David Forchelet, Arash Arami, Matteo Simoncini

Total knee arthroplasty is a widely performed surgical technique. Soft tissue force balancing during the operation relies strongly on the experience of the surgeon in equilibrating tension in the collateral ligaments. Little information on the forces in th ...

Mdpi Ag2014

Fabrication and Test of High-Temperature Ceramic Transformer

Thomas Maeder, Peter Ryser, Conor Joseph Slater

This work describes the fabrication and test of a high temperature (+200°C) capable high frequency transformer. It was manufactured using Low Temperature Co-fired Ceramic (LTCC) technology, which allowed the complex multilayer structure of ceramic and meta ...

2014

Tuneable PTC effect in polymer-wax-carbon composite resistors

Thomas Maeder, Peter Ryser, Caroline Jacq, Ludivine Ammon

Purpose: The resistivity dependence on temperature of composite resistors made of carbon fillers dispersed in an organic matrix are known to be strongly affected by the matrix thermal expansion. High positive temperature coefficient (PTC) effects, i.e. ess ...

Emerald2014

Quasiuniversal Connectedness Percolation of Polydisperse Rod Systems

Peter Ryser, Claudio Grimaldi, Biagio Nigro

The connectedness percolation threshold (eta(c)) and critical coordination number (Z(c)) of systems of penetrable spherocylinders characterized by a length polydispersity are studied by way of Monte Carlo simulations for several aspect ratio distributions. ...

American Physical Society2013

Depletion-interaction effects on the tunneling conductivity of nanorod suspensions

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We study by simulation and theory how the addition of insulating spherical particles affects the conductivity of fluids of conducting rods, modeled by spherocylinders. The electrical connections are implemented as tunneling processes, leading to a more det ...

American Physical Society2013

Instrumented Knee Prosthesis for Force and Kinematics Measurements

Steve Tanner, Kamiar Aminian, Philippe Renaud, Catherine Dehollain, Arnaud Bertsch, Peter Ryser, Eric Meurville, Pierre-André Farine, Oguz Atasoy, Brigitte Jolles-Haeberli, Arash Arami, Willyan Hasenkamp Carreira, Shafqat Ali, Matteo Simoncini

In this work, we present the general concept of an instrumented smart knee prosthesis for in-vivo measurement of forces and kinematics. This system can be used for early monitoring of the patient after implantation and prevent possible damage to the prosth ...

Ieee-Inst Electrical Electronics Engineers Inc2013

Effects of Thermal Losses on the Heating of a Multifunctional LTCC Module for Atomic Clock Packaging

Thomas Maeder, Peter Ryser, Fabrizio Vecchio, Conor Joseph Slater

An innovative multifunctional LTCC module has been designed for miniature atomic clock packaging. The components of miniature atomic clocks need to be efficiently packaged and connected to each other, and a precise temperature control is required for them. ...

Trans Tech Publications Ltd2012

Size-selective diffusion in nanoporous alumina membranes for a glucose affinity sensor

Jean-Michel Sallese, Peter Ryser, Eric Meurville, Christophe Boss

The retention, diffusion and structural properties of 2–4 nm nanoporous alumina membranes were investigated in view of their integration as size-selective interface in a glucose sensor. These membranes exhibit remarkable glucose diffusion properties with o ...

Elsevier2012

Test vehicle for studying thermal conductivity of die attach adhesives for high temperature electronics

Thomas Maeder, Peter Ryser, Fabrizio Vecchio, Conor Joseph Slater

Polymer adhesives offer a viable method for mounting silicon dies for high temperature applications. Here a test vehicle for comparing the thermal conductivity of different die attach materials is presented. The setup can be used to determine the degree of ...

Trans Tech Publications Ltd2012

3D structuration of LTCC and related technologies for thermal management and microfluidic structures

Thomas Maeder, Peter Ryser, Caroline Jacq, Bo Jiang, Fabrizio Vecchio, Conor Joseph Slater

Ceramic technologies such as LTCC (Low Temperature Co-fired Ceramic) and thick-film are used widely in electronic circuits exposed to harsh environments, for applications in fields such as aerospace, automotive and energy exploration, where, owing to their ...

Soc Microelectronics, Electron Components Materials-Midem2012

Piezoresistive effect in epoxy–graphite composites

Thomas Maeder, Peter Ryser

In this work, we investigate the piezoresistive response of epoxy–graphite composites. A resistive thick-film Wheatstone bridge is deposited by screen-printing onto a beam, a weight is then applied on the tip of the beam and the resulting electrical signal ...

Elsevier2012

Effects of Thermal Losses on the Heating of a Multifunctional LTCC Module for Atomic Clock Packaging

Thomas Maeder, Peter Ryser, Fabrizio Vecchio, Conor Joseph Slater

An innovative multifunctional LTCC module has been designed for miniature atomic clock packaging. The components of miniature atomic clocks need to be efficiently packaged and connected to each other, and a precise temperature control is required for them. ...

Trans Tech Publications2012

Tunneling and percolation transport regimes in segregated composites

Peter Ryser, Claudio Grimaldi, Biagio Nigro

We consider the problem of electron transport in segregated conductor-insulator composites in which the conducting particles are connected to all others via tunneling conductances, thus forming a global tunneling-connected resistor network. Segregation is ...

2012

LTCC integrated miniature Rb discharge lamp module for stable optical pumping in miniature atomic clocks and magnetometers

Thomas Maeder, Peter Ryser, Herbert Shea, Vinu Lalgudi Venkatraman, Fabrizio Vecchio

We report here on an integrated mini-lamp module (15x26x4 mm3) with a microfabricated rf-powered Rb dielectric barrier discharge (DBD) lamp (10x10x3 mm3) positioned on top of a 0.6 mm thick (thickness adjustable) 4-layer LTCC (Low Temperature Co-fired Cera ...

IEEE2012

Long-term mechanical reliability of ceramic thick-film circuits and mechanical sensors under static load

Thomas Maeder, Peter Ryser, Caroline Jacq

In this work, we study the long-term mechanical strength under static load - i.e. static fatigue performance or resistance to subcritical crack growth - of ceramic thick-film circuits, namely how the static fatigue of the substrate is affected by the prese ...

Elsevier2012

Tunneling conductivity in composites of attractive colloids

Peter Ryser, Claudio Grimaldi, Biagio Nigro

In conductor-insulator nanocomposites in which conducting fillers are dispersed in an insulating matrix, the electrical connectedness is established by inter-particle tunneling or hopping processes. These systems are intrinsically non-percolative and a coh ...

American Institute of Physics2012

Individual particle handling in a microfluidic system based on parallel laser trapping

René Salathé, Horst Vogel, Peter Ryser, Mathieu Grossenbacher, Michael Werner, Bastien Rachet

We present an optical trapping system combining individually addressable multiple laser traps with fluorescence spectroscopy. An in-line set of 64 near-IR laser diodes is used to create a line of individually addressable traps inside a microfluidic chip. T ...

Optical Society of America2011

Dispensing and Hermetic Sealing Rb in a Miniature Reference Cell for Integrated Atomic Clocks

Thomas Maeder, Peter Ryser, Herbert Shea, Vinu Lalgudi Venkatraman, Fabrizio Vecchio

An innovative method for filling and sealing the reference cell for a Rubidium (Rb) integrated atomic clock is presented. We used a simple, low-temperature solder sealing technique for producing mini-cells of the size of 12 x 10 x 2 mm, suitable for Rb min ...

Elsevier2011

Contactless rotational concentric microviscometer

Emeric Grandjean, Peter Ryser, Eric Meurville, Sigfrid Straessler

We investigated the feasibility of a concentric rotational microviscometer which is actuated remotely. This type of sensor might find application in vivo as a passive implant. The heart of the sensor is a cylindrical rotor, actuated from a distance of up t ...

2011