Results 161 to 170 of about 75,030 (206)

Capacitive micromachined interdigital transducers

The Journal of the Acoustical Society of America, 2001
Capacitive Micromachined Ultrasonic Transducers (CMUTs) have become very popular for medical imaging and sonar applications during the last decade. They can compete with piezoelectric transducers in terms of efficiency and bandwidth. Recently, it has been noticed that these devices couple energy into silicon wafer in addition to the immersion medium ...
Goksen G. Yaralioglu, Mohammed H. Badi, Butrus T. Khuri-Yakub   +2 more
openaire   +1 more source

An interdigital transducer for acoustic imaging

Applied Physics Letters, 1977
We have devised a simple acoustic focusing device with an interdigital transducer in which all radiation from each section of the transducer constructively interferes at a focal point in water. The device is applicable to the acoustic imaging in both transmitting and reflecting modes.
Kohji Toda, Yoichi Murata
openaire   +1 more source

Field theory for interdigital transducers

Journal of Applied Physics, 1978
The analysis of quasiacoustic-wave excitation by the uniform interdigital transducer is approached from a field point of view. Fields within the transducer are expressed in terms of a set of normal-mode functions which have been defined specifically for the interdigital array.
M. J. Zuliani, V. M. Ristic
openaire   +1 more source

Description of interdigital transducers

Journal of Applied Physics, 1972
Interdigital transducers can be represented as a linear array of elements that emit and reflect surface waves. This phenomenological description enables one to calculate the properties of these transducers accurately, provided that weak reflections between short-circuited finger pairs are taken into account.
openaire   +1 more source

Diffraction analysis of slanted finger interdigital transducers

2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121), 2001
For analysis, Slanted Finger Interdigital Transducers (SFIT) are usually divided into many channels in parallel to the propagation direction. Every channel is considered to be a subfilter. This procedure neglects the diffraction completely. The present paper introduces the diffraction in the SFIT analysis by use of the Angular Spectrum of Plane Waves ...
G. Martin, D. Chen
openaire   +1 more source

Equivalent networks for SAW interdigital transducers

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1994
An equivalent network approach is described for the analysis of surface-acoustic-wave interdigital transducers. Circuit parameters can he theoretically determined by applying the finite-element method to an infinite array. In this approach, all the effects of piezoelectric perturbation, mechanical perturbation, and energy storage are taken into account,
K. Inagawa, M. Koshiba
openaire   +1 more source

Interdigitated PVDF transducer for flaw detection

SPIE Proceedings, 2006
Since the recognition of the advantages of using Lamb Waves in nondestructive testing (NDT), Lamb Waves and other guided waves have attracted more and more attention nowadays. Unlike waves used in conventional ultrasonic inspection, such as bulk longitudinal and shear waves, which propagate in the region of structure immediately around the transmitting
Hua Gu, Ming L. Wang
openaire   +1 more source

A New Interdigital Electrode Transducer Geometry

IEEE Transactions on Microwave Theory and Techniques, 1974
A new interdigital electrode transducer geometry has been conceived and its theoretical performance verified experimentally. The transducer is composed of sets of electrodes which are connected in series through an offset or "dog-leg" electrode, thereby significantly increasing the electrical impedance of the transducer over that of a conventional one ...
K.M. Lakin, D.W.T. Mih, R.M. Tarr
openaire   +1 more source

Interdigital Transducer Interaction with SAWS and BAWS

IEEE 1987 Ultrasonics Symposium, 1987
The aim of this work is a rigorous approach to the two-dimensional analysis of excitation, propaga- tion and detection of acoustic waves. For the efficient computation of the dynamic charge distribution on IDTs we use the concept of Green's function and the method of moments.
K.C. Wagner, G. Kovacs, A.R. Baghai-Wadji, F. Seifert   +3 more
openaire   +1 more source

Algorithm for optimization of interdigital transducer in AOTF

Optics & Laser Technology, 2007
Abstract The interdigital transducer is an important device element in acousto-optic tunable filter (AOTF) and the surface acoustic wave (SAW) propagates in lithium niobate (LiNbO3) as a substrate in interdigital transducer. In the direction of x-cut y propagation in AOTF, the power-flux vector and propagation direction of the surface wave are not ...
Limin Zhang, Jisheng Yang
openaire   +1 more source