acoustic transducer Articles
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KLN Transducer Model Implementation Using Transfer Matrices
The Krinholtz, Leedom, and Matthaei transmission line model for acoustic transducers has been implemented on an IBM PC-XT computer using transfer, or "ABCD" matrices. Use of matrix formalism makes the programs easy to understand and allows quantities such as voltage, stress, strain and current to be readily calculated anywhere in the model. Previously difficult to model cases, such as open ...
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Fundamental Concepts In Acoustic Transducer Array Design
Abstract Ceramic strip resonators with rectangular cross-section have been made with aspect ratios (width to height ratios) from 0.1 to 30 . The short and open circuit resonant frequencies have been plotted as a function of aspect ratio and show good agreement between experiment and a simple coupled mode theory. The effect of loading these resonators acoustically with solids and liquids has also ...
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ZE: 908 Acoustic Interface - The simple way to integrate noise measurements in industrial settings
The ZE: 908 allows users to add a noise measurement capability to an existing process control system. The ZE:908 is a small, lightweight power supply and acoustic conditioning unit for microphone preamplifiers, it is ideal as a front-end for data logging and analysis systems where a simple and accurate acoustic input is required as an interface between an acoustic transducer and a process ...
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Computer-Optimized Design of Quarter-Wave Acoustic Matching and Electrical Matching Networks for Acoustic Transducers
We have developed an Iterative computer program to optimize the parameters for the acoustic matching layer(s) and the electrical matching network of a transducer for a minimum length of the impulse response. By including the Interactions between electrical and acoustic matching in our model » we have been able to significantly improve the quality of our transducers. A 3.65 MHz center ...
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An Edge-Bonded Surface Acoustic Wave Transducer Array
Abstract A new type of transducer array has been designed and built for Imaging surface defect in metals such as aluminum. The array is formed by edge-bonding a piece of piezoelectric material to a substrate of the same material as the sample to be tested. The individual elements in the array are formed by photolithography, and each element acts as an edge-bonded surface wave transducer. The ...
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The Design of Broadband and Efficient Acoustic Wave Transducers
Abstract The basic design criteria for SAW transducers is typically a flat frequency response. design criteria for bulk wave transducers in nondestructive evaluation and medical imaging is the compactness of the impulse response. This criteria is different from the usual flat frequency response criteria because a flat bandwidth does not necessarily imply a compact impulse response. Aniterative ...
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Quantitative Analysis of Pulsed Ultrasonic Beam Patterns Using a Schlieren System
Abstract The acoustic output from pulsed ultrasonic transducers has traditionally been analyzed with a hydrophone. Recently, a new faster technique has been developed using the principles of optical diffraction. This schlieren method allows the direct two-dimensional visualization of the ultrasonic beam as a pulse train. In order to obtain quantitative information in the form of temporal-average ...
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Turbine flow measurement in intakes: a cost-effective alternative to measurement in penstocks - Case Study
Hydro utilities require flow meosurement for the settlement of turbine contracts and to support optimal operation. The high costs and inconvenience associated with traditional methods (instruments installed in penstocks) are leading some utilities to search for cost-effective alternatives. BC Hydro's investigations into flow measurement in intakes are discussed. Typical practice for turbine flow ...
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A Numerical Procedure for Calculating the integrated Acoustooptic Effect
Abstract The integrated optical effect of light passing through an ultrasonic field can be numerically calculated from the velocity distribution assigned to a planar transducer. The theory is developed for linear acoustics, nonabsorbing media, and normal incidence of light. As a consequence of the application of the Fourier projection slice theorem, an algorithm based on digital Fourier ...
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A Novel Device for Total Acoustic Output Measurement of High Power Transducers
Abstract A robust needle hydrophone has been developed for HIFU transducer characterization and reported on earlier [1]. After a brief review of the hydrophone design and performance, we demonstrate its use to characterize a 1.5 MHz, 10 cm diameter, F-number 1.5 spherically focused source driven to exceed an intensity of 1400 W/cm at its focus. Quantitative characterization of this source at high ...
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Highly Efficient Transducer Arrays Useful In Nondestructive Testing Applications
Abstract Two types of highly efficient transducer arrays are described which couple acoustic energy into the samples imaged in nondestructive testing applications. The first type of array utilizes fully slotted, double quarter-wave matched elements to couple the acoustic energy from the high impedance ceramic to water, which is used as the transmitting medium. One such 180 element linear array ...
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Transducer shadow correction for applied technologies Sonic K-Probe
In the K-probe, as in many sonic probes available today, the transducers at the ends of its acoustic paths cast a "shadow" on the paths, causing the measured wind velocity component along the path to be underestimated. The degree of attenuation is a function of the angle between the wind direction and the acoustic path which increases with decreasing angle, reaching a minimum at 0°. At angles ...
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Comparing Nondestructive Testing Methods for Welding
One of the most common uses of nondestructive testing (NDT) is the examination of weld integrity. This is because welds are extraordinarily common in critical industrial applications across the world. The ability to inspect welds nondestructively is essential, as destroying one for testing necessitates replacing it with a new, untested weld. As such, there has been significant technological ...
By Zetec, Inc
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Flow Measurement Test At G. M. Shrum Powerplant - Case Study
W. A. C. Bennet dam and G. M. Shrum generating station (GMS) are located on the Peace River in northeastern British Columbia, Canada. ...
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