Measurement Types; Length; Point To Line - GE Mentor Visual iQ Manual Del Usuario

Choose the Right Measurement Type
Choose the Right Measurement Type
For Your Application
For Your Application
While multiple measurement types may be used for certain applications,
While multiple measurement types may be used for certain applications,
this chart is intended to show the expert recommendation.
this chart is intended to show the expert recommendation.

Length

Length
• Simple measurement of features or
• Simple measurement of features or
components
components
• Length of cracking
• Length of cracking
• Component size migration through
• Component size migration through
expansion or erosion/corrosion/wear expansion or erosion/corrosion/wear
• Remaining size of wear indicators
• Remaining size of wear indicators
• Location/zone of indications on a part
• Location/zone of indications on a part

Point to Line

Point to Line
• Turbine blade edge damage
• Turbine blade edge damage
• Gap width
• Gap width
• Weld width • Weld width
• Missing blade corners
• Missing blade corners
Depth
Depth
• Blade tip to shroud gaps • Blade tip to shroud gaps
• Pits or dents from corrosion, erosion, or
• Pits or dents from corrosion, erosion, or
FOD impact FOD impact
• Pipe inside diameter
• Pipe inside diameter
• Weld height
• Weld height
• Stator vane rock
• Stator vane rock
• Gap width
• Gap width
Area Depth Profile Area Depth Profile
• Corrosion, erosion and pitting
• Corrosion, erosion and pitting
• FOD impact damage • FOD impact damage
• Maximum weld height
• Maximum weld height
• Maximum wear groove depth
• Maximum wear groove depth
6
102
Area Area • Blade corners
• Blade corners
• Coating loss
• Coating loss
• Surface area of pitting or corrosion
• Surface area of pitting or corrosion
• Area of FOD impact
• Area of FOD impact
Multi-Segment
Multi-Segment
• Total travel path of a crack • Total travel path of a crack
• Blade edge blending or indication entry
• Blade edge blending or indication entry
angle
angle
• More accurate than a length • More accurate than a length
measurement on curved or irregular measurement on curved or irregular
surfaces surfaces
Depth Profile
Depth Profile
• Depth of isolated corrosion or erosion
• Depth of isolated corrosion or erosion
pits pits
• Depth of FOD impact damage • Depth of FOD impact damage
• Weld height or wear groove depth • Weld height or wear groove depth
• Quick assessment of surface contours
• Quick assessment of surface contours
Measurement Plane Measurement Plane
• With Area for missing corners • With Area for missing corners
• With Point to Line for blade edge • With Point to Line for blade edge
damage
damage
• With Depth for blade tip to shroud gaps
• With Depth for blade tip to shroud gaps
• With Length or Point to Line for small • With Length or Point to Line for small
features
features
• With Area Depth Profile when measuring
• With Area Depth Profile when measuring
in a field of pits
in a field of pits

MEASUREMENT TYPES

MEASUREMENT TYPES
This section will detail each of the measurement types available on the Mentor Visual iQ videoprobe, suggest This section will detail each of the measurement types available on the Mentor Visual iQ videoprobe, suggest
applications where each technique can be most effective, and provide tips and suggestions for accurate applications where each technique can be most effective, and provide tips and suggestions for accurate
measurement setup.
measurement setup.
Length Length
Measures the straight-line distance between two selected cursor points.
Measures the straight-line distance between two selected cursor points.
Example Applications: Example Applications:
Simple measurement of features or components
• • Simple measurement of features or components
Indication length measurement (i.e., cracks)
• • Indication length measurement (i.e., cracks)
• Measurement of component size migration through Measurement of component size migration through
•
expansion or erosion/corrosion/wear
expansion or erosion/corrosion/wear
• Determining the remaining size of wear indicators Determining the remaining size of wear indicators
•
• Measuring location/zone of indications on a part Measuring location/zone of indications on a part
•
Best Practices to Improve Measurement Accuracy:
Best Practices to Improve Measurement Accuracy:
Length is a straight-line measurement . It is not suitable to
• Length is a straight-line measurement. It is not suitable to
•
measure the distance across a curved surface. measure the distance across a curved surface.
Review the 3D point cloud to ensure your cursors are
• Review the 3D point cloud to ensure your cursors are
•
located correctly. Diagonal or off-angle measurements will located correctly. Diagonal or off-angle measurements will
induce error.
induce error.
• Move the tip closer to make the target area as large on the Move the tip closer to make the target area as large on the
•
screen as possible, while keeping the cursor point areas in
screen as possible, while keeping the cursor point areas in
focus.
focus.
Watch for orange advisory indicators to ensure the
• Watch for orange advisory indicators to ensure the •
measurement distance is within the confidence interval.
measurement distance is within the confidence interval.
• In both 3D Phase and 3D Stereo measurement it is In both 3D Phase and 3D Stereo measurement it is
•
important to start with a crisp image so that the cursors can important to start with a crisp image so that the cursors can
be placed accurately on the indication. be placed accurately on the indication.
• Use a Measurement Plane when red areas prevent proper Use a Measurement Plane when red areas prevent proper
•
cursor placement or 3D noise may be affecting the result .
cursor placement or 3D noise may be affecting the result.
See the Measurement Plane section for details.
See the Measurement Plane section for details.
VideoProbe 3D Measurement Handbook VideoProbe 3D Measurement Handbook | 7
05/2018