نتایج جستجو برای: Piezoelectric Transducer

تعداد نتایج: 32490  

Journal: :iranian journal of medical physics 0
ameneh sazgarnia assistant professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran mohammad hosein bahreyni toosi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran ali shokry msc. in medical physics, mashhad university of medical sciences, mashhad, iran amir hosein sazgarnia m.sc. in electrical engineering, product technical support dept., huawei technologies co., tehran, iran. parvin layegh assistant professor, research center of endocrinology and metabolism, mashhad university of medical sciences, mashhad, iran tayebeh kianoush instructor, dept. of biochemistry, mashhad university of medical sciences, mashhad, iran

introduction: sonophoresis has been assessed as a novel approach to create skin permeability and drug delivery using low frequencies of ultrasound waves in the range of 20 khz to 3 mhz. in this study, a system including seven 40 khz piezoelectric transducers and an insulin chamber designed by the medical physics research center has been evaluated on hyperglycemic rabbits. materials and methods:...

Journal: :journal of research in rehabilitation sciences 0
مصطفی فخار امین مهنام مهدی ادریسی mostafa fakhar amin mahnam mehdi edrisi

abstract introduction: nowadays, the advanced technology of designing electronic circuits in very small size and with very low power consumption has led to development of wearable and implantable medical devices. however, the electronic circuits need power supply that is usually provided by relatively large and heavy batteries. the discharged batteries have to replaced or recharged for long tim...

2011
M. M. Elgazzar

Piezoelectric transducer (SAW devices) is a very important device in industry but it is very difficult to simulate it using any circuit-simulation program. This paper proposes a practical method to simulate the Mason’s model of piezoelectric transducer directly with no approximation for different values of the model’s components using PSPICE. The paper also improves the simulated circuit compon...

2011
IMAMUL MUTTAKIN SYED MOHD NOOH EKO SUPRIYANTO

Whereas ultrasound application has been emerging, the need of reliable transducer to comply with that purpose is also aroused. Multi-resonance transducer using lead zirconate titanate piezoelectric ceramics (PZT) was designed several years ago for dual Doppler and B mode use. As polymer material being popular in medical ultrasound, there are chances to combine it with former piezoelectric mater...

Journal: :The Journal of the Marine Acoustics Society of Japan 1992

2017
Shuyu Lin Jie Xu

The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characterist...

2014
Houguang Liu Zhushi Rao Xinsheng Huang Gang Cheng Jiabin Tian Na Ta

A new incus-body driving type transducer relying on piezoelectric stack, with broad frequency bandwidth, is proposed for use in a middle ear implant. To aid the design process of this transducer, a coupling biomechanical model of the human middle ear and the piezoelectric transducer was established by reverse engineering technology. The validity of this model was confirmed by comparing model pr...

Journal: :IEEE Trans. Contr. Sys. Techn. 2003
S. O. Reza Moheimani

Research on shunted piezoelectric transducers, performed mainly over the past decade, has generated new opportunities for control of vibration and damping in flexible structures. This is made possible by the strong electromechanical coupling associated with modern piezoelectric transducers. In vibration control applications, a piezoelectric transducer is bonded to, or embedded in a base structu...

2017
Houguang Liu Jinlei Cheng Jianhua Yang Zhushi Rao Gang Cheng Shanguo Yang Xinsheng Huang Mengli Wang

Implantable middle ear hearing devices (IMEHDs) have been developed as a new technology to overcome the limitations of conventional hearing aids. The piezoelectric cantilever transducers currently used in the IMEHDs have the advantages of low power consumption and ease of fabrication, but generate less high-frequency output. To address this problem, we proposed and designed a new piezoelectric ...

2017
Jie Xu Shuyu Lin Yan Ma Yifan Tang

Coupled vibration of a radially polarized piezoelectric cylindrical transducer is analyzed with the mechanical coupling coefficient method. The method has been utilized to analyze the metal cylindrical transducer and the axially polarized piezoelectric cylindrical transducer. In this method, the mechanical coupling coefficient is introduced and defined as the stress ratio in different direction...

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