GE Mentor Visual iQ Manual Del Usuario página 107

Measurement Plane Examples
Measurement Plane Examples
Turbine blade missing corner dimensions:
Turbine blade missing corner dimensions:
• Use a Measurement Plane with Area. Use a Measurement Plane with Area.
•
• Position the probe tip according to recommendations in the Position the probe tip according to recommendations in
•
Measurement Plane EVA Warnings section. the Measurement Plane EVA Warnings section.
• Place the Measurement Plane on the face of the blade near Place the Measurement Plane on the face of the blade near
•
the missing corner. the missing corner.
• Place an Area measurement with one cursor on each Place an Area measurement with one cursor on each
•
remaining corner, one cursor out in space where the corner remaining corner, one cursor out in space where the corner
used to be, and as many as are needed to follow the broken
used to be, and as many as are needed to follow the broken
edge. edge.
• After pressing "Done", adjust the cursors so that the
After pressing "Done", adjust the cursors so that the
•
extended lines line up with the blade edges near the missing
extended lines line up with the blade edges near the missing
corner region. corner region.
• The missing area, missing edge dimensions, and the corner The missing area, missing edge dimensions, and the corner
•
angle are all provided eliminating the need for additional angle are all provided eliminating the need for additional
measurements. measurements.
Turbine blade edge indication:
Turbine blade edge indication:
Use a Measurement Plane with Point to Line when 3D data
• • Use a Measurement Plane with Point to Line when 3D data
along the blade edge is missing or noisy.
along the blade edge is missing or noisy.
Position the probe tip according to the recommendations in
• Position the probe tip according to the recommendations in
•
the Measurement Plane EVA Warnings section.
the Measurement Plane EVA Warnings section.
Place the Measurement Plane on the face of the blade near
• Place the Measurement Plane on the face of the blade near
•
the indication.
the indication.
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Add a Point to Line measurement with the first two cursors
• • Add a Point to Line measurement with the first two cursors
placed on the edge of the blade and the third at the inner
placed on the edge of the blade and the third at the inner
edge of the indication.
edge of the indication.
The Edge View Angle (EVA) is displayed next to the MTD. The
• The Edge View Angle (EVA) is displayed next to the MTD. The
•
lower the EVA, the better the accuracy, especially when
lower the EVA, the better the accuracy, especially when
measuring on a rounded leading edge. When making a
measuring on a rounded leading edge. When making a
critical call, try to achieve an EVA of less than 15°. critical call, try to achieve an EVA of less than 15°.
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Measurement Plane Examples
Measurement Plane Examples
Turbine blade tip to shroud clearance: Turbine blade tip to shroud clearance:
Use a Measurement Plane with Depth when 3D data at the
• • Use a Measurement Plane with Depth when 3D data at the
edge of the blade is missing, noisy, or drawn down and
edge of the blade is missing, noisy, or drawn down and back
back toward the shroud as shown in the lower right image.
toward the shroud as shown in the lower right image.
Position the probe tip low to the shroud so that you can see
•
• Position the probe tip low to the shroud so that you can see
back under the blade. The left image below is captured from
back under the blade. The left image below is captured from
too far above the shroud as indicated by the 46° EVA.
too far above the shroud as indicated by the 46° EVA.
Place the Measurement Plane on the face of the blade near
• Place the Measurement Plane on the face of the blade near •
the desired measurement point . Too much spacing between.
the desired measurement point. Too much spacing between
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the cursors near the blade edge can increase error due to
the cursors near the blade edge can increase error due to
blade curvature.
blade curvature.
Place the first three Depth cursors on the shroud.
• • Place the first three Depth cursors on the shroud.
Position the fourth Depth cursor at the edge of
• • Position the fourth Depth cursor at the edge of the
the blade in the 2D image. This cursor is projected onto the
blade in the 2D image. This cursor is projected onto the
Measurement Plane, so it may appear slightly off the edge in
Measurement Plane, so it may appear slightly off the edge in
the point cloud due to missing or noisy 3D data at the edge.
the point cloud due to missing or noisy 3D data at the edge.
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VideoProbe 3D Measurement Handbook
VideoProbe 3D Measurement Handbook | 17
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