Mandli's Pavement Profile Scanner (PPS) system collects pavement testing data from a vehicle traveling at highway speeds using phase measurement laser radar. The PPS consists of a rotating polygon that directs a laser radar beam rapidly along a line of the pavement orthogonal to the vehicle's direction of travel. The core of the optical mechanical system is a rotating six sided polygon which synchronizes the modulated laser beam and receiver field-of-view as it sweeps the measurement spot through a 90ยบ arc at a constant 1,000 times per second. The resulting profile width is twice the height at which the polygon is mounted. The PPS allows full-lane transverse and longitudinal profiles to be collected safely and unobtrusively.
