SMART 3D scanning with LIDAR and structured light scanners – News on metrology and quality


Measurement service provider a3Ds from Braunschweig, Germany specializes in optical measurements. Components of different sizes are measured automatically and without contact. a3Ds works with state-of-the-art equipment found in many production lines.

To measure a SMART car, a3Ds measurement technicians used two different methods. First, a 3D model of the vehicle was created using a LIDAR scanner, which is necessary for subsequent scanning. The geometry also served as a collision body in the GOM ScanBox.

Since the light beam passes through transparent surfaces during LIDAR scanning, the SMART’s windshield and headlight glass were sprayed with AESUB’s auto-evaporating blue scanning spray. The layer thickness of AESUB blue is between 8 μm and 15 μm, depending on the form of application. After applying AESUB Blue to the parts of the car, those parts were fully scannable for about an hour. Complete sublimation of AESUB blue takes less than four hours. The duration of the sublimation is considerably increased by spraying on several layers. The sublimation time is also influenced by factors such as temperature, air circulation and component structure.

Once the digital geometry of the LIDAR scan was available, the SMART was positioned in the GOM ScanBox and the scan routines were adjusted based on the data obtained. The measurement in the ScanBox was fully automated.

Even in the ScanBox, transparent surfaces cannot be scanned without processing. The car was therefore sprayed again with an evaporating matting agent from AESUB. Due to the size of the component, AESUB green, available in container form, was used. The spray was applied with a gun in such a way that the transparent and shiny surfaces were completely covered with a white and homogeneous layer in a few minutes.

AESUB green has been optimized by the developers to have a minimum layer thickness. Applied with a gun, this thickness is between 10 μm and 20 μm. One liter of AESUB green can cover an area of ​​10 m² to 15 m². “AESUB green has the advantage of staying on the component for a long time, so we have enough time to stick to the measurement points. This means that it is not necessary to reapply the spray during the measurement”, says David Skuratowicz, CEO of a3Ds.

After the fully automated scan, the SMART was again removed from the ScanBox. The sweeping spray evaporated on its own within a few hours without the need for further cleaning. “It’s like magic,“said David Skuratowicz happily, “You come back the next day and everything is clean.

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