Gocator software now supports 3D mesh data
for advanced shape measurement and inspection of multi-view
360º surface scans. Mesh data consists of "stitched"
scans from multiple sensors. Consequently, end users receive
a 360º Mesh of the object that can be used for measurement
with other surface tools.
Photo: For our application example, we
will take measurements
of multiple features on the surface of a pipe fitting.
Step 1: Perform
high accuracy 6 DoF alignment
With six-degrees of freedom alignment, system
engineers can now generate high-accuracy 3D Mesh scans from
ring multi-sensor layouts. To perform alignment, we first set
up 4 sensors in a ring layout and scan an alignment target.
Captured data from each sensor is displayed simultaneously.
A prominent feature that designers benefit from with this process
is that they dont need to worry about physically aligning
the sensors to get overlapping laser planes. Physical alignment
is error-prone and very time-consuming, which is avoided entirely
with Gocators high accuracy 6 DoF alignment approach.
With the addition of a Surface Align Ring tool users can calculate
the transformations for the 4-sensor ring layout with 6 degrees
of freedom. The results of this high accuracy alignment are saved
in an XML file, and include compensations for X angle rotations.
We then load the XML file in a Surface Mesh tool, which stitches
the scan data from our 4-sensor ring layout into single mesh,
or 360º scan.
Step 2: Scan the pipe, apply aligned transformations,
and extract mesh surfaces
Users scan the pipe fitting with the ring layout multi-sensor
system and apply the same aligned transformations to the data
that was established in the previous step. The result is a 360º
Mesh of the pipe fitting, aligned with 6 degrees of freedom.
In order to apply measurements to multiple features on the 360º
surface of the pipe (including the radius of the straight section
of the fitting and the radius of bottom opening) users apply the
Mesh Projection tool to set a plane angle to project our surface
data from. The benefit of this tool is that it can extract any
number of surfaces from a single 360º Mesh scan. The projected
Surface data can then be used as an input for
any Surface tool.
Designers also have the ability to apply dedicated Mesh tools
directly to raw Mesh data (e.g. for dimensional and deviation
measurements), such as the Mesh Plane and Mesh Bounding Box tools.
Step 3: Apply Surface Measurements to the 360º Mesh Projection
Next users will apply measurements to our multiple
features of interest. To do this, we apply the Surface Cylinder
tool to the top surface of the pipe fitting, using separate instances
for each radius we want to measure.
In order to measure the feature on the bottom of
the pipe fitting, we add a Surface Circular Edge tool to determine
the internal radius of the opening.
To determine the external radius of the opening,
we simply duplicate the tool and change the search direction to
inward to generate our measurement result. We can add other Surface
tools to the projected data in the same way, allowing for advanced
measurement on the sides of objects or any other perspective we