Wojciech Zabierowski

A study on microbolometer electro-thermal circuit modelling

Electro-thermal models are commonly used in simulations and designing MEMS devices, also in case of microbolometers. These models allow to estimate sensors performance before fabrication that consequently impacts on fabrication cost. Coupling of electric and thermal domains and building appropriate model for carrying out simulations are crucial to detect all phenomena having impact for Readout Integrated Circuit. This article brings closer to the subject matter of circuit modelling (willingly implemented in MATLAB/SIMULINK or PSPICE tools) and to its theoretical background.

Multiscale flow model for simulation of biofluidic mixtures in Lab-Chip devices

Diagnostic Lab-Chip devices contains multiphase and multicomponent biochemical mixtures. For its simulation we propose multiscale flow model, which consist of macro-, meso-and micro-scale submodels. Hybrid Galerkin FEM algorithm was used solving model equations and obtain simulation results.

The use of mobile technology on the example of health and sports statistics application

Writing mobile application is very complex process. Programmer has to decide about lot of things. He has to choose best solution for him and application. The article describe example of tools kit which can be used in every project. It shows their advantages and benefits from using them. In next chapter described used technologies and showed their key properties. All solutions were chosen for mobile application for system Android. In last part showed application which was created using all before mentioned mechanism.

Parametrized model of MEMS microphone in comsol multiphysics

In this paper we present the parameterized model of MEMS condenser microphone built in Comsol Multiphysics environment. It is based on coupled electromechanic FEM simulation with help of analytical modelling. The model uses set of parameters that describes the structure dimensions and applied loads. The user attention is needed only for putting those parameters and choosing the desired types of simulation studies. The rest actions are performed automatically including the visualization of the results. The simulation studies were defined to calculate the microphone parameters such as membrane deflection, capacitance, pull-in voltage and sensitivity in both mV/Pa and dBV units.

FEM analysis of a 3D model of a capacitive surface-micromachined accelerometer

In this paper we present the analysis of a 3D model of a surface-micromachined accelerometer. It allows us to define basic mechanical parameters, which give us information about mechanical properties of the modelled sensor. The analysis has been performed in COMSOL Multiphysics software. We used the Finite Element Method (FEM) for the analysis of the 3D structure. We analysed the behaviour of our sensor for changing the acceleration up to 8g. We also checked the eigenfrequencies of the sensor in order to define its parameters.

Thermal coupling phenomenon in ICs cooled by integrated microchannels

Integrated microchannels are a novel cooling method which may help mitigating the problem of increasing power consumption of integrated circuits. However, the properties of such a cooling system are very different from the properties of conventional systems based on forced air convection. For example, thermal coupling work differently in such systems. In this paper, we analyze the impact of this phenomenon on chip temperatures. Additionally, the paper proposes several suggestions for task scheduling algorithms which take into consideration the transient thermal coupling.

Application supporting work of librarian

This paper presents a web application supporting the work of the librarian. It presents technologies discussion and the tools used to create the present system. Paper presents the presuppositions of the created system and describes the application architecture and database. The paper presents the functionality offered by the system for each of the three groups of users: administrators, readers and users.

Statistical optimization of the cantilever beams

There are developed Matlab^® code for optimize the cantilever geometric dimension for sensors of force field measuring.

Custom method for automation of microbolometer design and simulation

This paper presents an approach to facilitate the design of a microbolometer. It is based on three main steps: the construction of a simplified model in Matlab, automatic transfer of the generated model into ANSYS and the verification of the model using ANSYS FEM (Finite Element Method) simulation. The novel idea is the second step, realized using a special application, which reads the parameters from the simplified model and automatically creates a batch file for ANSYS with all appropriate material and geometry data as well as loads and simulation parameters.

Monte Carlo modeling of stiffness of MEMS membrane

Simulation step is nowadays one of the crucial in the design process of the device. It allows estimating the device performance and reducing the cost of the fabrication process. It is also very useful in statistical approach. As technological process is not ideal and always produce some deviation from established parameters, the final device has variable performance. In this paper, the statistical approach using Monte Carlo modelling is presented in order to estimate the stiffness of a rectangular membrane of various length to width ratio.