Non-Destructive
Evaluation
Team:
Ultrasound Testing
David Drozd
Sean Broderick
Rick Eckert
Joseph Oagaro
Consultant:
Michael Ciocco
Project Manager:
Shreekanth Mandayam
Introduction
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Ultrasound Applications
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NDE of metals and composites
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Customers Needs
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Internal Customer: Shreekanth Mandayam
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Effective Composite Scanning to find defect geometry, depth,
and location
External Customer
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Airplanes, Tanks, Sewer & Gas Pipelines
Future Marketing to airplane and pipeline manufacturers
Previous Work Done
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Ultrasound Testing of Concrete
Objectives
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Learn fundamentals in ultrasound testing and
ultrasound equipment
Image metal plates with known defects and
build ultrasound C-scan database
Scan Kevlar composites to find evidence of
disbonding and delaminations
Use Matlab for image processing to estimate
defect geometry
Ultrasonic Inspection
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Project Outline
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Ultrasound Basic
Metal C-Scans
Kevlar Composites
Image Processing
Project Timescale
Immersion Ultrasound Test Station
Scanner controller & stepper motors
Linear
actuators for
scanning
Immersion
tank
PC for
data acquisition
& processing
Ultrasound transducers
Test
specimen
Ultrasound Scanning Basics
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Thru Transmission
vs. Pulse Echo
A-Scan and CScan
TOF and
Amplitude
A-Scan and Gate Settings
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Settings
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Detection Threshold: 40%, Gate Width: 14.46 us,
Gate Start: 52.40us, Gain: 39db
Ultrasonic Inspection
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Project Outline
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Ultrasound Basic
Metal C-Scans
Kevlar Composites
Image Processing
Project Timescale
Ultrasound Imaging of Coins
C-Scans of 5/16” Metal Plates
5/16” thick metal plate
with 3mm defect
5/16” thick metal plate
with 7.5 mm defect
C-Scans of ½” Metal Plates
½” thick metal
plate with 3
mm defect
½” thick metal
plate with 6
mm defect
½” thick metal
plate with 7.5
mm defect
C-Scans of triangle and circle defects
3/8” thick plate with
3/16” circle defect
3/8” thick plate with
3/16” triangle defect
Ultrasonic Inspection
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Project Outline
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Ultrasound Basic
Metal C-Scans
Kevlar Composites
Image Processing
Project Timescale
Kevlar
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Kevlar Composites
Company located in Canada
There are 2 types of Kevlar:
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Pretreated Kevlar
Non-Pretreated Kevlar
Delamination
Kevlar
First Scans of
Kevlar
Each scan 1’x1’
Starting from
The right corner
Non-Pretreated Kevlar
Kevlar
Non-Pretreated Kevlar
Kevlar
Pretreated Kevlar
Ultrasonic Inspection
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Project Outline
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Ultrasound Basic
Metal C-Scans
Kevlar Composites
Image Processing
Project Timescale
Image Processing
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Objective
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Determine Geometry of Defects From
Experimental C-Scan Images
Use Fourier Descriptors to apply to
arbitrary defect geometries
Approach:
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Use basic image processing techniques to
estimate image shape and size
Image Processing Approach
Metal Specimen
C-Scan
Adjusted Image
Experimental Data
Metal Specimen
Original C-Scan
Histogram Balancing
Image Smoothing
Image Defect Geometry:
Actual
Experimental
Length = 1 in.
Length = 0.85 in.
Width = 0.5 in.
Width = 0.43 in.
Image Processing Techniques
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Random Defect Geometries
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Determine Fourier Descriptors of perimeter of any
arbitrary shape
Insensitive to:
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Translation
Rotation
Scale Changes
How to model?
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Develop basic shape images and process
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Circle, Rectangle, Triangle, Ellipse, etc.
Project Timescale
Future Planning
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Continue Scanning
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Build Database
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Metal, Kevlar, Coins, etc.
Model Random Defect Geometries
Continue Processing Research
Research Paper / Competition
Ultrasonic Inspection
¿ Questions/Comments ?