Pavement Profile Scanner (PPS)

Pavement Profile Scanner (PPS) The Pavement Profile Scanner consists of phase measurement Laser Radar (Ladar) with unparalleled precision, range, and sample rate optimized to meet the demanding requirements of pavement testing at highway speeds, combined with a rotating polygon to scan the Ladar along a line on the pavement 6 times per revolution. Rotating at 10,000 RPM the PPS scans 1,000 profiles per second or 1 every 2.5 cm at 80 K.P.H. measuring both elevation and reflectivity. With the polygon 2.1 meters high, the ±45° scan field of view produces a 4.2 meter wide profile. Polygon orientation determines how scans occur on the pavement. Two standard installations are with the rotational axis orthogonal to the direction of travel. This produces tranverse and longitudinal scans. Scanning transversely, the PPS yields state-of-the-art measurement of rutting and ride quality, overcoming all the shortcoming of conventional rut bars. Full lane coverage capturing line marking and shoulder condition is accomplished safely with no hardware extending beyond the vehicle. Longitudnial profile accomplishes performance not attainable with inertial referenced profilers. One scanner can meet diverse requirements since it is easily repositioned for different applications. TRANSVERSE SCANS Virtual “Rut Bar” without the Bar Full lane high resolution Up to 32 LP/IRI per lane Resolves edge condition Safe (Does not protrude) Clear of minor accidents Allows towing of vehicle Air transportable Vehicle Independent LONGITUDINAL SCANS Profile/Ride Quality Speed Independent Stop and go traffic No accelerometer Joint Performance Testing Realistic Load Profile No lane closure Safe high speed operation Features:  Employs two sidebands  Extends ambiguity > 3 meters  Reduced post processing  Increased robustness