Here's a little example:

A tunnel requires an entrance luminance of eg 270 cd / m².

For the planning is assumed a cover layer of the class "R3" and a q0 of 0.08. In the light-technical acceptance measurement it is determined that the luminance is not reached, however, the illuminances correspond to the calculations.

So far, it was usually common, in the case a third party company with the "pulling" of cores commissioned, these are then sent to an asphalt laboratory. A few weeks later you get the undoubted sound results. But in this process, a variety of factors can affect the final outcome. (Contamination, drilling dust, storage wrong and binder comes out)

Already in the 1980s, first steps were taken towards a mobile measuring system for determining the luminance coefficient. Mr. KD Range developed the method to measure with a mobile measuring device non-destructively on site. The so-called range reflectometers are still in many laboratories today.

We took up the procedure and made it "mobile". As a rule, we can give an initial assessment immediately after the measurement, the final evaluation is usually available in 1-3 days.

We record 2x4 measured values per measuring point and this, depending on your wishes, at 3-6 points per lane.