Surface deflection measurement using structured light

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Surface deflection measurement using structured light

Muzet, V. / Heinkele, C. / Guillard, Y. / Simonin, J.M.

Bearing capacity of road pavement is essential for optimum planning of road maintenance and rehabilitation. Maximum deflection is usually measured by punctual mechanical sensors at low speed (less than 10 km/h) which implies safety problems and discontinuous measurements. Moreover, pavement simulations showed that parameters describing the deflection basin are more sensitive to pavement damages than the maximum deflection. This is the case for example for cracking or delamination which could be detected by the radius of curvature or the deflection slope at a fixed distance from the load. A direct measurement of surface deflection could be very useful to estimate such parameters. A new measurement system based on imaging technology has been studied. This non-destructive method consists in the projection of a structured light on the road pavement and allows measuring a surface deflection and its gradient. A first experiment was carried out with a static system on the LCPC test track. The imaging technique was able to measure a surface deflection with satisfactory metrological performance.