| 摘要 |
PURPOSE:To accurately measure the thickness of pavement without being affected by the state of a roadbed while facilitating setting operation by comparing variation in the height before and after a road is surfaced by using a laser beam as a reference, and calculating the thickness of the pavement. CONSTITUTION:A pavement thickness detector consists of a laser light projector 2 which projects the laser beam 3, a distance detector 4 which outputs a signal every time a finisher 1 moves forth by specific distance, and 1st and 2nd laser light photodetectors 8 and 11. The detector 4 sends out a signal at intervals of distance L and an arithmetic device (not shown in a figure) which receives this signal increases an address pointer by one to (m+1) to read Xm+1 out of a memory area while writing Xm in the memory area according to the value (m) of the address pointer at this time. Then the difference T=y-Xm+1 from the output value (y) of the photodetector 11 is computed and the difference T is displayed as the pavement thickness on a display part.
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