High Speed Laser Profiling

High Speed Laser Profiling measures rutting, texture depth, roughness using 3D laser maps of the road surface

RPS uses high speed profiling to measure rutting, texture depth, roughness and form 3D laser maps of the road surface.

The system uses a careful calibration procedure to minimized errors, resulting in highly accurate results.

High Speed Laser Profiling
Crossfall and vertical horizontal curvature colour key

A cyclic colourmap is used to display the laser data, with the data moving through the entire colourmap every 30mm of vertical height.

When looking at the images, what needs to be understood is how to determine if a change in colour is indicating a dropped or risen pavement condition. This can be determined by finding the two colours on the colourmap, and then finding the closest distance between those top points on the colourmap and then determining if this is either in the positive or negative height change direction. When doing this you must remember that the colourmap is cyclic. For example:

A 10mm raise would be a change from blue to red, or a change from green to blue or a change from red to green. A 10mm drop would be a change from red to blue, a change from blue to green or a change from green to red. Figures 2 and 3 show this procedure in practice. Please note that in the images, the crossfall of the road has been removed to improve the ability to detect the differential movement between the slabs.

Crossfall and vertical horizontal curvature colour map

Cracking with spalling, and a raised patch. The height of the raised patch can be determined by noting the colour change is from blue/purple to red, thus corresponds to a positive rise of around 10mm. The spalling and cracks are also quite evident in the images.

Crossfall and vertical horizontal curvature graph

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