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Peter Ryser

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Publications associées (68)

Transport exponent in a three-dimensional continuum tunneling-percolation model

Peter Ryser, Claudio Grimaldi, Niklaus Johner

The tunneling-percolation mechanism of conduction in disordered conductor-insulator composites is studied for a realistic continuum model where conducting and impenetrable spherical particles are dispersed in a three-dimensional continuum insulating materi ...

2008

Formulation and processing of screen-printing vehicles for sacrificial layers on thick-film and LTCC substrates

Thomas Maeder, Peter Ryser, Yannick Sébastien Fournier, Caroline Jacq

Ceramic technologies such as thick-film and LTCC (Low Temperature Cofired Ceramic) are excellent platforms for the fabrication of mesoscale devices such as sensors, actuators, microreactors and MEMS packaging. This work presents two alternative screen-prin ...

2008

Application of graphite-based sacrificial layers for fabrication of LTCC (low temperature co-fired ceramic) membranes and micro-channels

Thomas Maeder, Peter Ryser, Hansu Birol

Fabrication of sensors and micro-fluidic structures from low temperature co- fired ceramic (LTCC) sheets is a growing interest in the micro-packaging community. Such devices usually have inner cavities, whose production is quite complicated. The most elega ...

Institute of Physics2007

Fabrication of a Millinewton Force Sensor Using Low Temperature Co-fired Ceramic (LTCC) Technology

Thomas Maeder, Peter Ryser, Hansu Birol, Ingo Nadzeyka

This study is aimed at outlining the fabrication of a novel piezoresistive force sensor using LTCC technology, which operates at millinewton range, yet is compatible with low cost thick-film fabrication process. Mechanical and electrical characterization o ...

Elsevier2007

Apparent nonuniversality in finite segregated tunneling-percolaiton models

Peter Ryser, Claudio Grimaldi, Niklaus Johner

We investigate the tunneling-percolation mechanism of DC transport nonuniversality for conducting particles of diameter Φ placed in series within the bonds of length Lof a regular lattice model. When L/Φ→∞ the resulting bond conductance distribution functi ...

2007

Capacitive micro force sensors manufactured with mineral sacrificial layers

Thomas Maeder, Peter Ryser, Yannick Sébastien Fournier, Simon Wiedmer

In this work a prototype of micro force sensor of range μN...mN is presented. Instead of the traditional piezoresistive strain sensing through thick-film resistors used for higher forces, a more effective principle is used: measurement of beam displacement ...

2007

Piezoresistivity and tunneling-percolation transport in apparently nonuniversal systems

Peter Ryser, Claudio Grimaldi, Niklaus Johner

We formulate a generalized tunneling-percolation model that describes the electrical properties of conductor-insulator cellular disordered systems. This model predicts and explains the experimentally observed universal and nonuniversal behaviors of such pr ...

2007

Study of the impact of high-voltage trimming on several characteristics of model TFRs and their stability

Thomas Maeder, Peter Ryser, Niklaus Johner, Caroline Jacq

In this work we study in more details the impact of voltage trimming on different characteristics of model thick-film resistors (TFRs). Two series of RuO2-based TFRs with different conducting grain sizes are studied. As the composition of model pastes is c ...

2007

Low-cost thick-film force sensors for the 100 N force range

Thomas Maeder, Peter Ryser, Giancarlo Corradini

This work presents calculations and measurements on a novel low-cost thick-film force sensor design for the 100 N force range. The mechanical concept of these force sensors is based on a double ring biaxial load, which allows the fabrication of simple sens ...

2006

Processing of Graphite-Based Sacrificial Layer for Microfabrication of Low Temperature Co-fired Ceramics (LTCC)

Thomas Maeder, Peter Ryser, Hansu Birol

The processing and application of graphite powder-based sacrificial layer for fabrication of microfluidic structures in LTCC is described. Such layers are produced as pastes, which are screen-printed in LTCC sheets to avoid sagging, by supporting closed, t ...

2006

High-Voltage Sensitivity Studies of Model Thick-Film Resistors

Thomas Maeder, Peter Ryser, Claudio Grimaldi, Niklaus Johner, Adrian Kambli, Caroline Jacq

In this work we seek to better understand the mechanisms governing pulse voltage trimming in disordered conductor-insulator composites. Therefore, we investigate the effect of the composition of thick-film resistors (TFRs) on sensitivity to high voltage pu ...

2006

Modification of Thick-film Conductors Used in IP Technology for Reduction of Warpage during Co-firing of LTCC (Low Temperature Co-fired Ceramic) Modules

Thomas Maeder, Peter Ryser, Hansu Birol

LTCC technology offers low temperature firing (

Trans Tech Publications2006

Influence of processing and conduction materials on properties of co-fired resistors in LTCC structures

Thomas Maeder, Peter Ryser, Hansu Birol

The motivation of this study is the need for fundamental understanding of the effects of processing conditions on the electrical properties of low- temperature co-fired ceramic (LTCC) tapes, those screen printed with commercial thick-film pastes of electro ...

2006

Driver alertness sensing

Armin Sulzmann, Jacques Jacot, Peter Ryser, Mario Bellino, Jan Holzbecher, Frédéric Holzmann

2006

Structuration and Fabrication of Sensors Based on LTCC (Low Temperature Co-fired Ceramic) Technology

Thomas Maeder, Peter Ryser, Giancarlo Corradini, Hansu Birol, Caroline Jacq

The purpose of this paper is to demonstrate sensors and structures fabricated using the LTCC technology, which has been addressed and employed increasingly as a smart packaging approach for several applications. The focus will be on inclination and cantile ...

Trans Tech Publications2006

Gas viscosity sensor

Peter Ryser, Sigfrid Straessler

A gas viscosity sensor comprises a signal processing circuit and a sensor element, including a gas pressure generating system and a differential pressure measuring system in fluid communication therewith, the differential pressure measuring system comprisi ...

2006

Automated Work Yard by Use of Decentralized Method

Armin Sulzmann, Jacques Jacot, Peter Ryser, Mario Bellino, Frédéric Holzmann

2006

Design and processing of low-range piezoresistive LTCC force sensors

Thomas Maeder, Peter Ryser, Giancarlo Corradini, Hansu Birol

Low-temperature cofired ceramic (LTCC) combines many advantageous features for low-range (force & pressure) piezoresistive sensors: ease of 3D structuration, availability of very thin sheets, low elastic modulus and yet reasonable mechanical strength. This ...

2005

Fabrication of low-temperature co-fired ceramics micro-fluidic devices using sacrificial carbon layers

Thomas Maeder, Peter Ryser, Sigfrid Straessler, Hansu Birol, Caroline Jacq

Ease of fabrication and design flexibility are two attractive features of low temperature co-fired ceramics (LTCC) technology for fabrication of complex micro-fluidic devices. Such structures are designed and processed using different shaping methods, the ...

2005

Liquid drug delivery micropump

Peter Ryser, Sigfrid Straessler

A pump system for the subcutaneous delivery of a liquid medicament, having a pump module (10) comprising a stator housing (28) with a chamber (30), a rotor (32) rotatably and axially slidably received in the chamber and comprising a first axial extension ( ...

2005

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