Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Primary Current Distribution Model for Electrochemical Etching of Silicon through a Circular Opening

A. Ivanov [1], U. Mescheder [1],
[1] Hochschule Furtwangen University, Furtwangen im Schwarzwald, Germany

Primary current distribution model for anodization of low-doped p-type silicon through a circular opening in frontside insulating mask is developed. The model is applied in two regimes of the process – pore formation and electropolishing – by definition of current density dependent functions of porosity and dissolution valence based on experimental results. As found also experimentally, ...

Simulations of MEMS Based Piezoresistive Accelerometer Designs in COMSOL

N. Bhalla[1], S. Li[2], and D. Chung[1]
[1]Chung Yuan Christian University, Taiwan, (R.O.C)
[2]National Tsing Hua University, Taiwan, (R.O.C)

Different configurations of MEMS based accelerometer has been made and analysed using COMSOL Multiphysics. The designs presented in this paper consist of a square shaped proof mass with flexures supporting it. Different position and varied number of supporting flexures attached to the proof mass makes each configuration distinct. The piezoresistors are placed near the proof mass and frame ends ...

MEMS Based Silicon Load Cell for Weighing Applications

D. Chauhan[1], B. D. Pant[2]
[1]Kurukshetra University, Kurukshetra, Haryana, India
[2]CSIR- Central Electronics Engineering Research Institute, Pilani, Rajasthan, India

Load cells are force sensors, which are used in weighing equipment. The objective of this work is to develop MEMS based load cell. In this work two different load cell designs were simulated. First design is based on compressing a meander like polysilicon strain gage for the measurement of high forces up to 10kN. Second design is based on MEMS pressure sensor consisting of membrane, on which ...

MEMS Based Sensor for Blood Group Investigation

M. Kaushik [1], S. Katti [1], V. Saradesai [1], P. Naragund [1], P. Vidhyashree [1], A. K. V. Nandi [1]
[1] B.V. Bhoomaraddi College of Engineering and Technology, Hubli, India

This article describes the design of MEMS based cantilever structure intended for determination of blood group and it is compared with manual method. Cantilever structure design has a sensing layer and when a blood sample comes in contact with this, results in coagulation. The surface tension in turn occurs due to chemical and biological reactions of antigen and antibodies resulting in ...

A Dynamic Electrowetting Simulation using the Level-Set Method

B. Cahill[1], A. Giannitsis[1], G. Gastrock[1], M. Min[1,2], and D. Beckmann[1]
[1]Institut für Bioprozess- und Analysenmesstechnik e.V., Heiligenstadt, Germany
[2] Department of Electronics, Tallinn University of Technology, Tallinn, Estonia

Electrowetting occurs with the electrical control of the surface wetting properties through the application of an electric potential. A simulation of electrowetting driven droplet dynamics is performed using the COMSOL Multiphysics level-set method for a sessile droplet and for a droplet in a microchannel. The response of the drop to a step voltage is studied. The contact angle at one edge of ...

Design, Simulation and Optimization of Bimorph Piezoelectric Energy Harvester

T. Desai [1], R. Dudhe [1], S. Ayyalusamy [1],
[1] Manipal University, Dubai, UAE

Piezoelectric energy conversion has received great attention for vibration-to-electric energy conversion over the last five years. A typical piezoelectric energy harvester is a unimorph or a bimorph cantilever located on a vibrating host structure, to generate electrical energy from base excitations. In this paper we have optimized the dimensions of the proof mass and the bimorph piezoelectric ...

Surface Acoustic Wave Based MEMS Resonator

S. Dixit[1], R. C. Jain[1]
[1]Jaypee Institute of Information Technology, Noida, Uttar Pradesh, India

Surface Acoustic Waves (SAW) is the acoustic wave that propagates along the surface of the substrate with amplitude decaying exponentially away from the surface. A basic SAW device consists of two IDT’s on a piezoelectric substrate such as quartz. Surface Acoustic Wave can be generated by application of a voltage to an IDT deposited on the surface of a piezoelectric substrate. The ...

COMSOL Multiphysics® Based Identification of Thermal Properties of Mesoporous Silicon by Pulsed Photothermal Method - new

N. Semmar[1], I. El Abdouni[1], A. Melhem[1]
[1]GREMI-UMR7344, CNRS/University of Orléans, Orléans, France

The silicon is mainly known under its single-crystal shape and polycrystalline. Since a few decades, a new type of morphology is developed: the porous silicon (p-Si). Meso-porous silicon (Mp-Si) is one of promising materials for future microelectronic chips multi-functionalization systems, and for micro-sensing devices. For thermal properties investigation many experimental systems were ...

Simulation of ZnO Enhanced SAW Gas Sensor

H. du Plessis[1], W. Perold[1]
[1]University of Stellenbosch, Stellenbosch, South Africa

Surface acoustic wave (SAW) devices are widely used for their sensing capabilities and gas sensing is only one of many uses. There is an ever increasing need to make them as effective as possible by adding nanomaterials to the device. In this study a two-port delay-line structure with 128YX lithium niobate was simulated with COMSOL Multiphysics® in the form of a 2D cross-section. ZnO nanopillars ...

CMUT Based Free Membrane Intra-Cardiac Volumetric Blood Flow-Meter

P. Priya [1], B. D. Pant [2],
[1] Birla Institute of Technology and Science Pilani, Pilani, Rajasthan, India
[2] CSIR-Central Electronics Engineering Research Institute, Pilani, Rajasthan, India

In this paper, a free membrane is used as a receiver to increase the capacitance and therefore the resolution of the flow meter. For the current application, from the wavelength of sound wave in soft tissue (c= 1540 m/s) the resolution was calculated to be 0.48 mm. This gives the first Eigen frequency of the capacitive structure according to which the poly silicon membrane was designed. After ...