laser versus white light scanning for email
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Laser Triangulation Technology
compared to Structured (White) Light
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Laser Triangulation AngleCamera & Lens
Camera & Lens
Laser Diode
Projector
Laser TraceCross Section of Patch
The angle used for the laser triangulation actually allows for capture of data on
edges and vertical walls. The standoff on white light systems means the angle is low,combined with smoothing and sharpening the edge results can be of low quality.
No points are captured
on the vertical wall.
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Top View
Cross section
Laser TriangulationVery good at capturing information on
edges. All data is captured in one
coordinate system so no patch stitching is
required. Camera is filtered for narrow band
of light so will work in most ambient light
conditions.
White Light vs. Laser Triangulation
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Top View
Cross section
White LightVery fast at capturing information on planer surfaces but not very good with
edges. Edge definition can be further distorted by automatic smoothing and edge
sharpening algorithms. Will either require lots of setup time on part for multiple
shots or require photogrammetry system. Scan patches are in different coordinate
systems and need to be stitched back together. Ambient lighting conditions can
effect performance of this type system by distorting transitions of white to black
White Light vs. Laser Triangulation
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Problems with patch Stitching
Part shot from
3 directionsTwo more shots will be
needed to tie the part
together.
Patches have no
relationship to each other
and no overlap to work
with.
With 5 shots the X andZ can be locked in.
The hoped for results
X
Y
Z
The results are a best fit with
nothing locking in Y axis. To do
this correctly you will need to
use targets and or
photogrammetry. Potato
chipping and error build-up are
problems with this technology.
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Hardware Scanworks V5 + Infinite Arm
Time 4 days
Customer Nanjing Automobile(group) corporation
Software Geomagic Studio
Alignment Steel balls glued on the car body first.
Steel balls used to align different scan passes.
Accuracy (less than)< 0.5mm(scan all minibuss surface error)
Strengths Unbeatable scanning speed
Flexible to scan underneath and inside the vehicle
No need for developer spray or powder
Can accurately measure very dark surfaces
Unconstrained by ambient conditions
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Inner Drivers Cabin
NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
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Complete Inside Surface
NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
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Complete Assembly of Inside and Outside surface with drivers cabin
NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
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Case Study: Car Scan
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Case Study: Car Scan
Hardware Scanworks V5 + Infinite Arm
Time 4 hours
Customer Changan Auto
Software Geomagic Studio
Alignment Steel balls glued on the car body first.
Steel balls used to align different scan passes.
Accuracy (less than)< 0.3mm(scan all car surface error)
Strengths Unbeatable scanning speedFlexible to scan underneath and inside the vehicle
No need for developer spray or powder
Can accurately measure very dark surfaces
Unconstrained by ambient conditions
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Complete Outside Surface
POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Inner Drivers Cabin
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Case Study:
Hardware Scanworks V5 + Infinite Arm
Time 3 day evaluation exercise
Customer Maruti Suzuki
Software PolyWorks V11
Alignment Used Principal Location Points/Features from CAD
For free-form parts, best fit alignment with 1/1 sub-sampling
Accuracy (less than)< 0.1mm
Strengths Unbeatable scanning speedUnbeatable edge and feature scanning
No need for developer spray or powder
No need for markers/targets
Can accurately measure very dark surfaces
Unconstrained by ambient conditions
Portable: Most parts scanned on shop floor
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Rear Closure Panel Inner
CAD data aligned with SCAN data
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Sharp Clear Edges and Distinct Features
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Sharp Clear Edges and Distinct Features
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Sharp Clear Edges and Distinct Features
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Sharp Clear Edges and Distinct Features
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NOT POSSIBLE WITH WHITE LIGHT SCANNER
POSSIBLE WITH LASER SCANNER
Sharp Clear Edges and Distinct Features
MarutiC
omponentParts
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