Transducer Modeling
Learning Objectives
Two port and three port transducer models
Sittig model
Mason model
KLM Model
Acoustic radiation impedance
Transducer sensitivity, impedance
The sound generation process
Transducer model - fields
Consider a P-wave
im

Linear Electrical and Acoustic Systems
Some Basic Concepts
Learning Objectives
Two port systems
transfer matrices
impedance matrices
reciprocity
1-D compressional waves in a solid
equation of motion/constitutive equation
acoustic transfer matrix of a lay

One of the first computer-based ultrasonic systems at ISU (about 1975)
Tektronix analog oscilloscope
x-y plotter
analog to
digital converter
equivalent time
sampling unit
pen
digital to
analog
converters
Digital Equipment LSI-II
computer
< 1 MHz processor

The Fourier Transform
Learning Objectives
definition of Fourier Transform and its inverse
of Fo
Transform and its in
reasons for use of the Fourier Transform
brief introduction to Fourier transform properties
delta function and its spectrum
definition of

Statistical Foundations of Pattern Recognition
Learning Objectives
Bayes Theorem
Decision-making
Confidence factors
Discriminants
The connection to neural nets
Statistical Foundations of Pattern Recognition
NDE measurement system
feature (pattern)
extract

Pulser Characteristics
- Models and Measurements
Learning Objectives
characteristics of "spike" and square wave pulsers
measurement of pulser electrical properties
effects of pulser settings
Pulser - Panametrics 5052 PR
rep rate
energy
attenuation
h.p. fi

Impedance Concepts and
Thvenin Equivalent Systems
Learning Objectives
Electrical impedance
Description of 1-D waves in a fluid
equation of motion/constitutive equation
plane waves - pulses and harmonic waves
l
frequency and wavelength
acoustic impedance
T

Ultrasonic System Overview
Learning Objectives
Overview of the UT system components that
will be discussed
The ultrasonic system components
oscilloscope display
pulser/
receiver
cabling
transmitting
transducer
receiving transducer
flaw
1
voltage versus
ti

Introduction to NDE Ultrasonic
Systems
Learning Objectives
familiarity with:
ultrasonic system components
ultrasonic NDE terminology
basic information on transducers
construction
types
common ultrasonic displays
Ultrasonic System Components
vi(t) input vo

Cabling - Models and Measurements
Learning Objectives
Cable transfer matrix model
Equivalent circuit model
Effects of termination conditions
Measurement of transfer matrix elements
Reciprocity check
Cable transfer matrix model
V1
I1
V1
I2
I1
V2
I2
[T]
V2