GE Mentor Visual iQ User Manual page 45

Point Cloud View (3DPM)
The point cloud view offers the following advantages:
• Provides a rough idea of feature size.
• Shows location of high and low points to help profile and depth measurement cursor
positioning.
• Shows the level of noise relative to indication size. You can then move the probe closer
if indication is hidden in surface noise bumps.
• Ripple or waves indicate dirt or oil on the gratings or reflections bouncing off one
surface onto another.
• When entered with no measurements placed, you can see the entire captured surface.
When the Point Cloud view is selected for an image with at least one measurement placed
(all apply to the measurement that is active when Point Cloud is selected):
- only the area around the active measurement is shown (unless Full View is selected)
- a reference plane is created using the measurement cursors
- the cursor positions and the lines between the cursors are shown
- for profile measurements, the profile slice along the surface and the line between the
two cursors are shown
- a square around the data, indicating the reference plane position, is shown
- a scale indicates the depth or height relative to the reference plane
Note—Indication of Non-Measurable Area
When working with a 3D phase measurement image, certain parts of the image may
not be measurable. These parts may be too far away, or be too dark, or obscured by
light reflections if the surface is highly reflective. The 3D Phase Measurement system
will display a red colored zone in those areas. To enhance measurement accuracy, the
system will not allow an operator to place cursors in a red colored area. The 3D Phase
Measurement system will display a yellow colored zone in those areas where accuracy
is reduced. Cursor placement in a yellow colored area should be avoided if possible.
07/30/2014
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