There is an increasing interest in using ultrasonic guided waves to assess the structural degradation of above-ground storage tank floors. This is a non-invasive and economically viable means of assessing structural degradation. Above-ground storage tank floors are ageing assets which need to be inspected periodically to avoid structural failure. At present, normal-stress type transducers are b...

Design, Development and Characterization of Wideband Polymer Ultrasonic Probes for Medical Ultrasound Applications Vadivel Devaraju Peter A. Lewin, Ph.D. This dissertation deals with the design, development and characterization of non-resonant polymer ultrasonic probes for medical ultrasound applications. Both single element and multielement imaging transducer design having single layer and mul...

This study examined outstanding issues of sensitivity calibration methods for ultrasonic and acoustic emission transducers and provides workable solutions based on physically measureable quantities, laser-based displacement measurement in particular. This leads to mutually consistent determination of transmitting and receiving sensitivities of sensors and transducers. Methods of circumventing p...

Finite element (FE) modelling of ultrasonic propagation using Comsol Multiphysics, or indeed any other FE software, inevitably involves large computations because two or three dimensional time-stepping models are needed to predict the behaviour of these kinds of travelling mechanical waves. Comsol can be used to create video of waves in these models, which is both attractive and informative. Un...

An advanced computerized complex for Ultrasonic Peening (UP) of parts and welded elements based on piezoelectric transducers was developed recently. The complex consists of a compact ultrasonic transducer, generator and a laptop with an Expert System for UP optimum application: maximum possible increase in fatigue life of parts and welded elements with minimum cost, labor and power consumption....

HIFU power measurement At ultrasonic laboratory of INRIM (Istituto Nazionale di Ricerca Metrologica) it is possible to measure the ultrasonic power emitted by HIFU (High Intesity Focused Ultrasound) transducers. Two different measuring systems for the determination of ultrasonic power have been developed. Both systems are based on the radiation force balance method. The first system is based on...

The air-coupled ultrasonic transducers and their applications to ranging, robotic vision and nondestructive testing etc. have been widely studied in recent years. Further studies should be concentrated on (1) the improvement of the sensitivity and bandwidth of the transducers, (2) the prediction and measurement method of the radiation pattern. Much attention has been paid to the former problem ...

A cost-effective design of an ultrasonic interface to a graphics tablet is accomplished by means of PIC microcontrollers. This paper analyses the design and implementation from requirements capture through high-level design to circuitry. Ultrasonic transducers enable direct placement of the tablet mechanism above an LCD so that the image is viewed as it is created. Results show that the prototy...