Author

Raul Urbina

Date of Award

2001

Level of Access

Open-Access Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

Advisor

Michael L. Peterson

Second Committee Member

Donald A. Grant

Third Committee Member

Vincent Caccese

Abstract

This thesis presents efforts to enhance the system performance of an ultrasonic scanning machine. New developments in electronics are used to enhance the system performance. This work focuses on optimizing the system repeatability with a robust triggering system for the scanner. The robust triggering system applies new advances in programmable logic devices that make the replacement of complicated digital circuits possible. Modeling of wave propagation through anisotropic media is used to increase the system dynamic range. The model-based gain control compensates for variations in thickness and materials by controlling the excitation pulse amplitude. The automatic gain is implemented using integrated RF signal control components. This thesis demonstrates the use of existing models of elastic waves in a novel application that makes use of modern electronics to control the scanning system.

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