introducing 3d phase measurement - ndt · 2011. 3. 1. · all xlg3 optical tips fit and work stereo...
TRANSCRIPT
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Introducing 3D Phase Measurement
New Optical Measurement Technique For the XLG3 Video Borescope Based on phase shifting principles of optical metrology, 3D PM is an Exciting Breakthrough for the RVI industry.
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3D Phase Measurement
Full-Screen, On-Demand Measurement Technology
Scans the part surface and creates a 3D surface map
All measurements and views performed on the 3D surface
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Comparison to Existing Measurement Technology: Stereo
Stereo Measurement
• Optics create a stereoscopic image
• The system matches points and creates depth information
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Comparison to Existing Measurement Technology: Shadow
Shadow Measurement
• Optics cast a shadow on the image
• The operator marks the shadow, giving the system distance to target information
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Stereo Measurement Limitations
Special-purpose measurement tip is not suited for general inspection
Measurement requires computer point matching from left to right views. Opportunity for error.
More complicated to use. Inspectors must be highly skilled to obtain accurate measurements.
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Other Limitations of Stereo
Point to point measurements
Less productive to use than a measurement On-Demand system like 3D PM.
Less accurate than 3D PM on depth measurements
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High-Level Features of 3D PM
Measurement On-Demand View + Measure without tip change
Full Screen Measurement Same view, larger defects
Easier to Use No Shadow Selection or Stereo Point Matching or Laser Point Selection
More Information 3D Surface, Depth Profile
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High-Level Features of 3D PM
Range Finder Gives distance LIVE
Auto Tip Selection No menu step
Better Accuracy Especially on Depth
Loose Tip Warning
Increased Measurement DOF Closer as well as Larger Defects
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High-Level Features of 3D PM
New Measurement Types and Views
Non-Measurable Zone Warning
More User Feedback and Guidance
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Customer Values
Productivity from Measurement on-demand vs. changing tips
Aid to shrinking workforce – easier to use, faster
Better results with less training. More inspectors can measure.
More accurate depth measurements in critical applications
Unique measurements like tip clearance, profile view
Unique 3D surface information
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Using 3D Phase Measurement
1. View with PM
2. Spot Defect
3. Freeze Image
4. Measure
Fewer Steps
Faster Results
Full Screen
105° FOV
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How 3D Phase Measurement Works
Full Screen View
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Phase Patterns
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Create 3D Point Cloud
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Then Measure
Length
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Supports All Standard Measurements
Length
Area
Point to Line
Depth
Segment
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Leading Edge Pitting
Gas Turbine
Steam Turbine
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Turbine Blade Clearance
Only possible with 3D PM!
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Gun Barrel Pitting
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Pipe Welds
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New Applications
3D Surface Image View Improved Understanding Gauge Noise vs. Feature Size
Measure Small Features Higher accuracy in depth measurements Can compare noise vs. feature size
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New Probes!
3D Phase Probes are different
Electrical connections to the tip
Internal light shutter
All XLG3 Optical Tips fit and work
Stereo Tips
Shadow Tips
General Viewing Tips
3D PM Tips
Contacts
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Lens
Arc Lamp Illumination
Phase Gratings
Double Threads
Side View Tip
14 mm 9mm longer than
headguard
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Forward View Tip
Lens
Arc Lamp Illumination
Phase Gratings
Double Threads
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Installing the Probe and Tips
Install the 3D Phase Probe
Attach 3D Phase Tip, either Forward View or Side View
The system will automatically identify the tip installed
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Use the probe and tip for general inspection
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Range Finder
Bars change color from Red to Yellow to Green
More bars the better
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Once you see an indication…
Press and HOLD
the ENTER Button or Trigger to Capture an Image Short press of
ENTER or Trigger is a Freeze Frame, and will NOT capture an image
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Measurement
Once the image is captured, select
Measure from the MENU
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Measurement
Measurements are made on the 3D Surface Map and projected onto the White Light image that we are accustomed to seeing.
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Measurement Type
Phase > Length
> Pt-Line
> Depth
> Area
> Multi-Length
> Depth Profile
Then choose Measurement Type
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Length
Place first cursors at one end point of length being measured
Place Second cursor at opposite end of length being measured
Measurement then appears on screen
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Pt-Line
Create a reference line by placing first two cursors along reference area
Place third cursor at the desired location to be measured
Be sure to place cursors on the edges
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Depth
Place first 3 cursors on the same plane around object being measured
Place forth and final cursor on the point desired for depth measurement
When cursor is placed, Measurement will appear on screen
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Blade Tip Clearance
Special type of Depth Measurement
Scan an image that includes the side of the blade and the shroud at approximately a 45 degree angle so both are in view.
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Blade Tip Clearance
Position the reference triangle cursors on the shroud below the edge of the blade.
Position the Depth cursor on the NEAR edge of the blade.
System returns an accurate tip clearance measurement
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Area
Place up to 24 cursors around object the object being measuring
When final cursor is placed, double click enter to display measurement
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Multi-length
Place first cursor at one end point of line being measured
Place up to 24 cursors along measurement location
Double click ENTER to display measurement
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Depth Profile – A New Measurement
Creates a cross-section depth cut perpendicular to a reference plane.
Always perpendicular, even if the camera angle is not!
So depth measurements are accurate!
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Depth Profile
Place two cursors so that they cross measurement area
A line appears between the cursors
Depth measurement will appear to show the deepest point along the line
Cursors should be on the same flat plane to work best
Depth Profile Measurement
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Profile View
Press and Hold ENTER to switch to Profile View
The center cursor and the two end cursors can be moved to measure different points
Some of the surface waves are noise
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Point Cloud
While viewing a Depth Profile Measurement
Menu>Image>Point Cloud
Can tilt, spin image Point Cloud
Depth Profile Measurement
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Depth Map
Depth Map is a false color view of the Point Cloud
Blue is closer to the tip
Red is further away
While viewing a Point Cloud Image, Press Menu
Click Depth Map, On
Depth Profile Measurement
Depth Map
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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.
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Red Areas
Red will appear on screen when a user moves a cursor over an un-measurable area
Red areas are caused by glare, distance too far, or lack of pattern distinction.
Red Areas are a helpful user feature, aiding
accuracy and preventing poor measurements!
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Max Target Distance - MTD
MTD is distance from tip to furthest cursor
Replaces accuracy index
Lets the user verify they are working within an accurate range
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Recap 3D PM
Full-Screen, On-Demand Measurement Technology
Scans the part surface and creates a 3D surface map
Dynamic new technology for new and existing measurement applications
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3D Phase Measurement
A new Era in Remote Visual Inspection for part and indication analysis!