Picture of smart phone in human hand

World leading smartphone and mobile technology research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by Strathclyde researchers from the Department of Computer & Information Sciences involved in researching exciting new applications for mobile and smartphone technology. But the transformative application of mobile technologies is also the focus of research within disciplines as diverse as Electronic & Electrical Engineering, Marketing, Human Resource Management and Biomedical Enginering, among others.

Explore Strathclyde's Open Access research on smartphone technology now...

Improving the bandwith of 1-3 connectivity composite receivers using mode coupling

Gachagan, Anthony and Hayward, Gordon (1998) Improving the bandwith of 1-3 connectivity composite receivers using mode coupling. Journal of the Acoustical Society of America, 103 (6). pp. 3344-3352. ISSN 0001-4966

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Temporal resolution in an ultrasonic system may be enhanced by the application of mechanical damping to the transducer rear face, thereby reducing internal reverberation and increasing effective bandwidth. However, for thickness drive transducers, this is accompanied inevitably by a reduction in sensitivity and, moreover, manufacture of suitable damping blocks can be difficult, particularly for lower frequency, small signal applications such as the detection of gas coupled ultrasound. This work describes an interesting alternative approach that utilizes the relatively strong coupling between the fundamental thickness mode and first lateral mode in 1-3 connectivity piezocomposite transducers.Finite elementmodeling is used to evaluate the influence of mode interaction on electromechanical coupling efficiency, surface displacement, sensitivity, and bandwidth as functions of the ceramic pillar dimensions for operation into both water and air load media. A range of composite devices was constructed and close agreement between theory and experiment is demonstrated, with a measured device bandwidth of 130% centered at 1.15 MHz. An example of using such a device within a gas-coupled ultrasonic system is presented and the response is shown to compare favorably with alternative transducer configurations.