An optimized fringe generator of 3D pavement profilometry based on laser interference fringe

Abstract As pavement distresses have more negative influences on the driving safety and comfortableness,pavement distress detection and maintenance becomes more significant. 3D pavement profilometry can help analyze the type and severity of the pavement distress, which provides a basis for pavement maintenance. This paper has employed laser interference fringe on 3D pavement profilometry. This new technology has great research value and prospect on improving the measurement accuracy.However,the fringe generators used in previous 3D profilometry technologies performed close-range projection (