Advancements in Remote Visual Measurement Technology · 2015-10-08 · © 2015 General Electric...

© 2015 General Electric Company. All rights reserved

Advancements in Remote Visual

Measurement Technology

Tom Britton

Aviation Specialist

GE Inspection Technologies

Remote Visual Inspection (RVI)


UltrasonicRemote Visual

Inspection Radiography Eddy CurrentTesting

Machines

Data Management Software

Film, Equipment

and Chemistry

Digital

Radiography

(FS, CR, DR)

X-ray Generators

Instruments

and Probes

Automated

Systems

Ultrasonic and X-

ray

Standard

Customized

Video Borescopes

Borescopes

Fiberscopes

PTZ Cameras

Collaboration SW

Re-Measurement

SW

Inspection

Services

Rentals

Rhythm Acquire Inspection Works

Rhythm Review - Inspection

Manager

Rhythm Archive - Inspection

Connect

GE Inspection Technologies

Metrology

3D Computed Tomography

Flaw Detectors

Thickness

Gauges

Hardness Testers

System

Instrumentation

Transducers

Installed Sensors


3

Mentor Visual iQThe Power of Productivity in your hands


4

• Faster, easier

navigation

• Pinch to zoom

• Precise cursor

placement

• Efficient text and

arrow annotation

• Use with gloves

• Clear, bright

resolution

HDR

Touchscreen


• 6.75 lbs

• Aircraft

compliant

• Lithium-ion

battery

• Easily stores in

overhead

compartments

• Battery or AC

capable

Portable


6

• Designed to IP65,

MIL-STD-810G

and MIL-STD-

461F standards

• High temperature

resistance

• Stands up to

severe

environments

• Dustproof

• Waterproof

Durable Design


Mentor Visual iQ

7

• Modern dual action User Interface (UI)

with trigger function

• 6.5” XGA LCD with Touchscreen-

supports gesture based zooming

• Interchangeable probes

• 16 GB internal memory

• Wi-Fi and Bluetooth connectivity

• DisplayPort Digital Video interface

• USB 3.0 & USB-slave ports

• Detachable 2-hr Battery

• IP65 Environmental rating

• 3D Surface Scan & 3D-Stereo

Measurement

• Integrated Portable design

• New 4mm High Res. with tip optics suite

• Mentor TM Inspection Connect platform

Feature Overview

Imagination at work.

© 2005 by Everest VIT, Inc.

Comparison (Scalar)

Measurement

Technology

Remote Visual

Inspection


Comparison Measurement Principles

•Comparison measurements use the size of a known

object (often set in place by the manufacturer, or

introduced with the probe) to measure other objects

in the same view and plane.

•Such measurements are made using frozen or

recalled images.

•Choose optical curvature distortion correction for tip

•Probe must be perpendicular to item of interest to be

measured.

•Item of interest to be measured must be the same

approximate distance from the probe tip as the

reference measurement used.

5


Comparison Measurement

Technology


Scaling Pixels- basis for measurements

• The Computer counts the number of pixels between the 2

cursors.

• It then divides that number into the value assigned by the

inspector.

• Each and every pixel on screen is given the same calculated

value.

• Assigning a value to each pixel is the basis for Comparative,

Shadow

• and Traditional Stereo Measurement

Comparison Measurement – How It Works

• The bolt head is a known 0.500 inches.

• The inspector marks both sides with a cursor.

• The computer counts the number of pixels between the cursors.

• In this case, there are 50 pixels so the value per pixel is 0.010 in

• (0.500 inch/50Pixels = 0.01 inches per Pixel)

• So now our unknown hole diameter is 25 PIXELS wide or

• 25 Pixels X .010 in/pixel = 0.250 inches


When & Why To Use Comparison

Measurement

•Do not have a 3DPM or stereo tip

•Need to measure further away than a 3DPM

or stereo tip will allow (Object to be measured

is too big to fit within the field of view)…such

as Combustor Liner crack measurements

•Cannot place obtain a “measurable” 3DPM

or Stereo image

•Ideal for checking the approximate size of

many items quickly


Freeze the image – Select Comparison Measurement

How To Perform Comparison Measurements


Select a tip



Select a measurement type



Mark known dimension points



Enter known dimension



Place cursors on item of interest



© 2005 by Everest VIT, Inc.

Shadow Measurement

Technology

Remote Visual

Inspection


ImagerShadow

Tip

Fiber

Bundle

Shadow

Slit

Aperture

Z1 Z2

Shadow Measurement Technology

Clos

eFar

• Full FOV of defect target

• Image is darker due to shadow creation

• Target should be on a perpendicular plane


MViQ3D Phase Measurement


Phase Shifting Scanning Typical Setup

CameraProjector

Object

Image 0

Image 1

Image 2


Phase Shifting in the XLG3

LED

Arrays

Shadow

PatternViewing

Optics

LED

Arrays

3D Phase Tip


3D Phase Measurement Technology

3D Phase Measurement Technology

Red LED Fringe Pattern projected onto

surface

And the fringes have structure:

- 120 deg phase shift

- Sinusoidal Intensity

Imager3D PM Tip

Z1 Z2

LEDs


Optics Configuration Fringe patterns are projected using 2

sets of LEDs on each side of viewing

optics.

Object distance at each point is

computed using pattern trajectories

(triangulation) known from

calibration.


By projection of a sequence of binary

coded stripe patterns, the subsequent

light levels for each scene pixel are

forming a unique binary word revealing

the individual stripe number. To minimize

the effect of bit errors, the stripe patterns

are designed to change only one bit per

stripe (Gray codes)

At least 3 phase shifted gray gradient

patterns are needed for a precision

analysis of position from the gray values.

Three simultaneous color patterns are

also used in certain applications.

Phase Shifting TechnologyReference

http://en.wikipedia.org/wiki/Struct

ured-light_3D_scanner

http://en.wikipedia.org/wiki/3D_s

cannerArea

http://www.vrac.iastate.edu/%7E

song/publications/papers/2006-

oe-realtime.pdf

http://patents.com/us-

7821649.html

http://en.wikipedia.org/wiki/File:13-stripes-s.png

http://en.wikipedia.org/wiki/File:13-stripes-s.png

http://en.wikipedia.org/wiki/File:14-phasec.jpg

http://en.wikipedia.org/wiki/File:14-phasec.jpg

http://en.wikipedia.org/wiki/Gray_code


Fringe Phase Images


Image CaptureTest Fields

Bright Set x 2

Dark Set x 1

Middle Set x 3

Merged Set

3D Phase Measurement Measurement Types

& 3DPoint Cloud Visualization


MViQ – User Interface: Measurement Operation


GE Confidential

Image Enhancements - Views

• MViQs provides multiple image Views

• Normal, HDR, Bright, Dark

MVIQ Advanced Image Processing Technology


GE Confidential 34

Image Enhancements - ViewsStandard View HDR View

Bright View Dark View


35GE RVI

10/8/2015

3D Surface Scan Measurements

3D Surface Scan

Key Features• Measurement on

Demand

• Measure from any

attack angle

• Wide-view 105o FOV

• Auto Tip-ID

• 6 Measurement

Types

3D Surface Scan Measurement(full-screen view)

Stereo Measurement(two half screen views)


36GE RVI

10/8/2015

Length Area Measurement

Multi-Segment Length Point to Line Measurement

Depth Measurement

Depth Profile Measurement

6 Types of 3D Surface Scan Measurements


37GE RVI

10/8/2015

Length Measurement


38GE RVI

10/8/2015

Multi-Segment Length


39GE RVI

10/8/2015

Area


40GE RVI

10/8/2015

Point to Line


41GE RVI

10/8/2015

Point to Line


42GE RVI

10/8/2015

Depth


43GE RVI

10/8/2015

Depth on Plane - for Blade Clearance


44GE RVI

10/8/2015

Depth Map

Point Cloud

3D Surface Scan Measurement

Automatically

find Point

furthest from

reference plane

(-0.179”)

New Measurement Type: Depth Profile

Measurement

3D Surface ScanningPhase Measurement Technology


45GE RVI

10/8/2015

New Measurement Technique: Depth Profile

• Place two cursors

• System creates perpendicular cut

• Displays cross section

• Automatically finds deepest point


Profile Cut View


Cross- Section: Profile View


Unmeasurable Areas

RED: No 3D Data

Too far away, Shiny Surface, Out of sight (no scanning),

Glare, Speckle, Hot spot, Motion, …...


Understand the Point Cloud


Point Cloud

• Use Point Cloud to validate cursor placement and understand target surface geometry

• Can tilt, spin and zoom image

Point Cloud

Depth Profile Measurement


Depth Map

• Depth Map is a color view of the Point Cloud

• Blue is closer to the tip

• Red is further away

Depth Profile

Measurement

Depth Map


52GE RVI

10/8/2015

Point Cloud and Depth Map

If no measurement has been made, entire viewing area is displayed.

If a measurement has been made, view is cropped to a circle drawn around the measurement.


Reflection on surface of 3DPM image

(Visual Layer)


3DPM IMAGE EXPORT TO CAD SOFTWARE PACKAGE

Create CSV file from 3D Image

3D Print Indications


56© 2015 General Electric Company. All rights reserved

Understand the Point Cloud – Choose Correct Measurement Type

Verify Cursor Placement Using Point Cloud

– Prevent Measurement Errors

Incorrect !

Correct !


3DPM Application Example

Tip-to-Shroud Clearance Measurement



Depth-Profile Measurement of Erosion Damage



Blade Leading Edge Damage Measurement



Corrosion Pit Damage Measurement

0.003”

corrosion

pit depth


3D Stereo Measurement & Point-Cloud Visualization


Stereo Tip Optics


Stereo Technology

Head Assembly

Light Guide

Aperture

Lens

CCD Imager

Stereo Optical Tip

Two Images

Splitting Lens

Light Guide

Illumination

Tip/Head Construction

Target Object


Traditional Stereo Measurement Image


3D STEREO IMAGE


3D Stereo Basics

• Same Basics for StereoProbe

apply

• Side-by-Side Image Analysis

White Light View in LH

Window

Point Cloud view in RH

Window

• MTD Replaces Index

• Point Cloud generation

• Assisted Verification on

Measurement Verification Block

• Enhanced UI Messages

• Six (6) types of measurements


New ! Dynamic Warning Messages

User Interface Status Messages are measurement-context sensitive

Final captured image may have warning (orange) band on measurement result

MTD Defect Size Image Status Message

0.966 inch 0.116 inch Measurement 1 None

0.966 inch 0.045 inch Measurement 2 “Move closer to target or move

cursors for better results”

Example:

Status bar

message

Orange

advisory

band around

measuremen

t results


3D Stereo Hardware / Software

• Uses Same tips as traditional stereo

• New Tip Calibration process and

execution software required

• Systems can be upgraded


Complimentary 3D solutions for a wide range of measurement applications

Measurement

Technology

Reasons to use Reasons not to use

3D Phase • Measure on demand

• Point cloud visualization

• Full screen view

• Auto Tip recognition

• Only available on 6.1mm

• Excess motion

• Shiny surfaces

• Narrow deep features

3D Stereo • Available on ALL diameters

• Point cloud visualization

• Not as motion sensitive as 3DPM

• Better measurement on reflective

surfaces

• Better repeatability than traditional

stereo

• More difficult to navigate with

dual view

• Struggles with bland surfaces

• Lower image quality

Comparison

(Scalar)

• Good for large measurements ( > 2

inches) which cannot be performed

by 3DPM or Stereo

• Available for all diameters

• Good for quick Go / No-Go

assessment

• Item of known dimension

must be in (or introduced

into) area of inspection

• Inspection target must be

perpendicular to probe


Coming in Q4 20153D MEASUREMENT HANDBOOK

Contact us.

72

GE Remote Visual Inspection

721 Visions Drive Skaneateles, NY 13152

Tel: (888) 332-3848 (Toll-free, USA only)

Tel: (315) 554-2000 (Ext. 1) Fax: (866) 899-4184

Advancements in Remote Visual Measurement Technology · 2015-10-08 · © 2015 General Electric...

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Transcript of Advancements in Remote Visual Measurement Technology · 2015-10-08 · © 2015 General Electric...