Non-Destructive Evaluation

Ultrasound Testing

Team:

David Drozd

Sean Broderick

Rick Eckert

Joseph OagaroConsultant:

Michael Ciocco

Project Manager:

Shreekanth Mandayam

Introduction Ultrasound Applications

NDE of metals and composites Airplanes, Tanks, Sewer & Gas Pipelines

Customers Needs Internal Customer: Shreekanth Mandayam

Effective Composite Scanning to find defect geometry, depth, and location

External Customer Future Marketing to airplane and pipeline

manufacturers

Previous Work Done Ultrasound Testing of Concrete

Objectives 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 Project Outline

Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing

Project Timescale

Immersion Ultrasound Test Station

Ultrasound transducers Testspecimen

Immersiontank

Linearactuators forscanning

Scanner controller & stepper motors

PC fordata acquisition & processing

Ultrasound Scanning Basics

Thru Transmission vs. Pulse Echo

A-Scan and C-Scan

TOF and Amplitude

A-Scan and Gate Settings

Settings Detection Threshold: 40%, Gate Width: 14.46

us, Gate Start: 52.40us, Gain: 39db

Ultrasonic Inspection Project Outline

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 Project Outline

Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing

Project Timescale

Kevlar Kevlar Composites Company located in Canada There are 2 types of Kevlar:

Pretreated Kevlar Non-Pretreated Kevlar

Delamination

Kevlar

First Scans of Kevlar

Each scan 1’x1’Starting from The right corner

Non-Pretreated Kevlar

KevlarNon-Pretreated Kevlar

KevlarPretreated Kevlar

Ultrasonic Inspection

Project Outline Ultrasound Basic Metal C-Scans Kevlar Composites Image Processing

Project Timescale

Image Processing Objective

Determine Geometry of Defects From Experimental C-Scan Images

Use Fourier Descriptors to apply to arbitrary defect geometries

Approach: Use basic image processing techniques

to estimate image shape and size

Image Processing Approach

Metal Specimen

C-Scan

Adjusted Image

Experimental Data

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.

Metal Specimen

Image Processing Techniques

Random Defect Geometries Determine Fourier Descriptors of perimeter of

any arbitrary shape Insensitive to:

Translation Rotation Scale Changes

How to model? Develop basic shape images and process

Circle, Rectangle, Triangle, Ellipse, etc.

Project Timescale

Future Planning Continue Scanning

Build Database Metal, Kevlar, Coins, etc.

Model Random Defect Geometries Continue Processing Research Research Paper / Competition

Ultrasonic Inspection

¿ Questions/Comments ?