Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Ultrasonic System Measurement Model  I
Learning Objectives
Use of a simple fluid model to obtain a complete
measurement model
extension to a fluidsolid model
Ultrasonic System Model Single Fluid
Vi()
pulser
receiver
St
transducer
eio
zi
VR
Sr
flaw
zs
es
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Acoustic/Elastic Transfer Function
Learning Objectives
Modeling the acoustic/elastic wave processes as
a transfer function
Blocked force concept
Special cases where the transfer function can be obtained
analytically
Effects of material attenuation
Acousti
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Wave Propagation Fundamentals 3
Ultrasonic Attenuation
Learning Objectives
Attenuation definitions
Simple method for measuring average attenuation
Modelbased approach for determining attenuation
as a function of frequency
Ultrasonic Attenuation
A1
plane
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Ultrasonic System Measurement Model  II
Learning Objectives
Definition of a Measurement Model
Three Types of Measurement Models
Auld Model
ThompsonGray
Model for 2D scatterers
Verifying the Modeling Assumptions
and Measurements Needed
Ultrasonic Measure
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Neural Networks
Learning Objectives
Characteristics of neural nets
Supervised learning Backpropagation
Probabilistic nets
What is a Neural Network?
According to the DARPA Neural Network Study
(1988, AFCEA International Press, p. 60):
. a neural network i
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
The Ultrasound Reception Process
Learning Objectives
Blocked force as a "lumped" source on reception
Thevenin equivalent transducer/sources on reception
Measurement of receiving cabling properties
Characterization of receiver as impedance, gain
and measur
Design & Analysis Methods for System Improvements.
I E 222

Spring 2013
Wave Propagation Fundamentals 1
Propagation of Plane and Spherical Waves
Learning Objectives
Plane waves in fluids and solids
Elastic wave potentials
Spherical waves in fluids and solids
Plane Waves  Fluid
Waves in a fluid satisfy the wave equation
1 2