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Investigation on Sensor Fault Effects of Piezoelectric Transducers on Wave Propagation and Impedance Measurements

For active Structural Health Monitoring (SHM), one popular sensor type is the piezoelectric wafer active sensor (PWAS) due to its multi-purpose application as actuator and sensor and its low cost. It is used to generate a wave field, which interacts with the structure and is recorded by a second set of PWASs. This method is called acousto ultrasonics. The change in wave field from transducer damage is modeled in CO ...
www.comsol.com/paper/15458

Simple Disk Piezo Transformer Based Oscillator

In this contribution we present a COMSOL Multiphysics® example of a disk piezoelectric ceramic transformer (D-PT) coupled with a bipolar NPN transistor to form an auto-oscillator. The comparison between the simulations and the measurements made on our prototype are found to be in good agreement. Having at our disposal a large number of homogenously poled disks, we decided to build and to investigate the performances ...
www.comsol.com/paper/18213

Ultrasound Piezo-Disk Transducer Model For Material Parameter Optimization

The technology involved in high performance ultrasound imaging probes needs a reliable model to help in new projects development and performance simulations. To achieve a useful model, it is necessary to use correct values for all material parameters involved in the electro-acoustical performances of the piezoelectric material, but unfortunately some of these parameters are known only with high uncertainty and other ...
www.comsol.com/paper/7876

Thermal Analysis of a Piezo-Disk Ultrasound Probe

Ultrasound imaging probes are widely used for several types of diagnosis applications. In the present work we focus our attention on a disk-type probe, which is widely used in CW and PW operating conditions. In particular we present a 2D-axial symmetry FEM for the probe, capable to predict both the operative temperature values at different driving signal frequencies, both the heating dynamics. Moreover, the FEM is va ...
www.comsol.com/paper/12562

Simulation of a Forming Process for Joining a Piezo Aluminium Module

The fabrication of piezo aluminium composite modules for sensor and actor applications with mass production technologies is in the scope of the SFB/Transregio 39 PT-PIESA project funded by the (German Research Foundation). After forming of cavities with a width of 0.3 mm into aluminium sheets by micro impact extrusion and the insertion of 0.25 × 0.25 mm2 piezo rods, a joining of the rods into the material is ...
www.comsol.com/paper/8702

Studies of Lead Free Piezo-Electric Materials Based Ultrasonic MEMS Model for Bio sensor

This paper describes the design of an ultrasonic transducer using different lead free piezo-electric materials and evaluates their performance with different glucose levels in the human blood. COMSOL Multiphysics 4.2a was used for the simulation study using 2D axis symmetric model of piezoelectric transducer which was designed with lead free piezoelectric materials such as Barium Sodium Niobate (BNN), Barium ...
www.comsol.com/paper/13595

High-Intensity Piezo-Ceramic Ultrasonic Transducer with Mechanical Amplifier and Radiation Plate

A COMSOL Multiphysics® model was made to design a mechanical amplifier and radiation plate for the emission of high intensity 40.5 kHz ultrasound to air by means of a Langevin type transducer usually applied in cleaning baths for example. In this work, ultrasonic irradiation is aimed at acting on flue gas containing fine particulate matter to realize a shift to higher effective particle sizes as a result of induced ...
www.comsol.com/paper/14538

Piezotyres

Access to electricity has become a major problem. In the process of solving this problem we should consider even a small source of electricity. Piezotyres are made to produce electricity from vehicle tyres. For this we have used a piezoelectric property, one of the natural wonder. COMSOL Multiphysics® was used to design and simulate it virtually. We have used different materials in the software for designing. We su ...
www.comsol.com/paper/15327

Modeling of Vibrating Atomic Force Microscope´s Cantilever within Different Frames of Reference

Cantilever vibration modes were simulated with COMSOL Multiphysics. In the 1st approach the model consisted of an excitation piezo, a holder plate and a chip where the cantilever was mounted on. A sinusoidal voltage signal was applied to the piezo in the simulation, which resulted in movements of the holder plate and finally led to the excitation of the cantilever. In the 2nd approach the ...
www.comsol.com/paper/5319

Characterization of a Tonpilz Transducer and Performance Analysis for a MEMS-Transducer Array

In this paper, we develop and analyze a standard piezoacoustic Tonpilz-transducer model for underwater acoustics in Comsol by addressing the attendant piezoelectric and pressure acoustic multiphysics phenomena. Transducer properties that are studied and characterized are the center frequency, bandwidth, linearity, sensitivity, and noise figure. In an effort to miniaturize the transducer, a functionally similar but ...
www.comsol.com/paper/11512

Simulation of Nuclear Radiation based Energy Harvesting Device using Piezoelectric Transducer

MEMS(Microelectromechanical systems) based energy harvesting is process of extracting energy from natural resources in small amounts. Here, number of (millions) small energy harvesting modules lead to substancial energy. In this design, a piezoelectric material is used to scavenge energy from natural resources like radioactive source. COMSOL Multiphysics is used to model and simulate a microcantilever with a laye ...
www.comsol.com/paper/11454

Simulation of DC Current Sensor

A proximity DC current sensor using of a piezo sensed and actuated cantilever beam with a permanent magnet mounted at its free end is designed and simulated in COMSOL Multiphysics. The change in resonant frequency of cantilever is a measure of the current through the wire. The sensor is found to be linear with good sensitivity. ...
www.comsol.com/paper/9170

Simulation of Acoustic Energy Harvesting Using Piezoelectric Plates in a Quarter-Wavelength Straight-Tube Resonator

An acoustic energy harvesting mechanism at low frequency (~200 Hz) using lead zirconate titanate (PZT) piezoelectric cantilever plates placed inside a quarter-wavelength straight-tube resonator has been studied using COMSOL Multiphysics 4.3 and compared with experimental data. When the tube resonator is excited by an incident wave at its acoustic eigenfrequency, an amplified acoustic resonant wave inside the tube dr ...
www.comsol.com/paper/13717

A Low Cost CMOS Compatible MEMS based Fingerprint Sensor Design

In this paper, a novel design of a fingerprint sensor composed of a 2D array of piezo resistive micro beams has been presented. When the user presses the sensor array with a finger, the ridges and valleys that compose the fingerprint induce corresponding deflections in the micro beams. These deflections can be detected by means of a resistivity change, which when used with appropriate signal processing circuits ...
www.comsol.com/paper/13910

Active Control of a Smart Structure using PID Controller

Smart structures can sense responses and adapt to satisfy specified objectives. The objective of this study is to control the vibrations of the beam subjected to external dynamic forces. The composite beam consists of a layer of aluminum sandwiched between two layers of steel. The beam is fixed at one end and free at the other. The actuator is a piezoelectric device embedded in the aluminum layer. A Proportional Inte ...
www.comsol.com/paper/15289

Extraction of COM Parameters and Quality Factor of One Port SAW Resonator Using FEM Based Simulation

The paper presents a method of extraction of coupling of modes (COM) parameters for a one port surface acoustic wave (SAW) resonator from the results of finite element analysis in COMSOL Multiphysics®. The COM parameters calculated are electromechanical coupling coefficient, reflection coefficient, and SAW phase velocity. In addition, the quality factor of the SAW resonator is determined. The parameters are calculat ...
www.comsol.com/paper/19913

Modeling of III-Nitride Quantum Wells with Arbitrary Crystallographic Orientation for Nitride-Based Photonics

piezo-polarization fields, background layer doping, and variable level of charge carrier injection. Calculated optical characteristics include electron-hole optical susceptibility, spontaneous and stimulated emission rates, polarization coefficients for light emission and absorption, radiative recombination rates, and optical gain spectra in optically active nitride QWs. ...
www.comsol.com/paper/5472

Heat Drain Device on Ultrasound Imaging Probe

Self-heating is a problem to consider for Ultrasound Imaging probes. Since the probe is in contact with the skin, it’s necessary to find a solution to lower the front face temperature in order to avoid patient discomfort, even at the most demanding operating condition. One solution consists in the design of a device that drains the heat from the front to the rear of the transducer, where a heat dissipator operat ...
www.comsol.com/paper/18439

Innovating New Products using Multiphysics Modeling

Dr. Shekhawat is currently the General Manager for New Products Development at Secure Meters Ltd., Udaipur. Prior to this, he was with CEERI, Pilani for 23 years. He has a Ph.D., MS, M. Sc. (Physics) and BE (EEE) from BITS, Pilani. He is the recipient of several honours including the DAAD Fellowship, Germany and National Science Talent Fellowship. His areas of research include Ultrasonic Transducers and Flow Measurem ...
www.comsol.com/paper/14185

Study & Modeling of 'Acoustic Matching Layers' for Ultrasound Imaging Probes Through Pulse-Echo FEM Simulation

Ultrasound Imaging probes are specific devices that require a very detailed design of acoustic impedance match for the stack of layers that form the probe head (1,3). These are typically made of silicone rubber, special epoxy resins, polyurethanes and, of course, piezoelectric materials. The acoustic impedance, measured in Rayls, have to be matched similarly to an electric circuit (2), from a high impedance power ...
www.comsol.com/paper/18551