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Laser triangulation sensors can be used to measure
glass. In systems of type arcus-ws, they are used
to measure the deflection of 2-pane-safety windshields
for cars.
To produce a defined deflection in a windshield,
the panes are transported through an oven on special
transport frames and exposed to a specific spatial
and temporal heat profile.
directly behind the oven, the hot panes are measured by three
laser distance sensors in three tracks. Because of the layered
nature of the safety glass, there are multiple reflections
of the laser beam. The resulting disturbances of the measurement
data are eliminated using special filtering algorithms.
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Fifty repeated measurements on a windshield with a
deflection of 13 mm resulted in a standard deviation of
the measuring system of < 10 μm. With a resulting
cg-value of 20 the meausring system capability has
been proven within the production environment.
The system described here is in 24/7 operation at various international
locations. It is used for quality assurance and to optimize
the oven process.
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Technical data
| Property |
Value |
| max. dimension of windshields |
1,85 m x 1,35 m |
| Thickness of a single pane |
2 mm |
| max. deflection |
25 mm |
| Temperature of the windshields |
150 - 250 °C |
| Measuring range of the laser distance sensors |
130 mm |
| Measuring frequency |
bis 6 kHz |
| Measuring time |
ca. 10 s |
| Standard deviation during repeated measurements |
< 10 μm |
| Articles and Brochures |
Download |
| Autoteile unter Laseraugen (Laser und Photonik 2/2007) (german) |
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