AMAC® More than a Road Profiler - ERPUG · • high power pulsed near infrared laser diode, • 2 sensors, left and right sensors, • Transversal width view per profile: 1280 points

VECTRA Road Engineering 1

AMAC® More than a Road Profiler

Didier ROUVEIXPresented byLuc-Amaury GEORGE


French motorway networks are managed by private companies.Their pavement management systems are based on surveys and measurements acquired previously by Sirano operated by Vectra.Built in the 90’s and after 13 years of duty, Sirano had to be changed.

Historical context


AMAC® multifunction inspection apparatus, full integrated, was developed by VECTRA in collaboration with LCPC. AMAC® is a full integrated multifunction equipment, with functions such as:

Transverse Laser Profiler,Longitudinal Laser Profiler,Distress evaluation on road surface pictures,Road geometric characteristics and GPS positionRolling noise,Digital Cameras for pictures


Transverse Laser Profiler LRMS

Longitudinal Laser Profiler MLPL©

Distress evaluation on road surface

picturesRoad geometrics and GPS

Rolling noise

Digital Cameras for pictures


All the Subsystems are driven and referenced in distance.The operators use the GUI to operate any function and get either a global overview either a detailed function feedback


Profilers on AMAC


Function Longitudinal Profile of AMAC®Longitudinal profile on AMAC is a non contact profiler, the function is the continuity of the APL MLPC equipment, qualified by the French Roads Laboratory (IFSTTAR) .Composed, in standard configuration (two wheel tracks) of:

• One rigid beam in which the sensors are mounted,• Two lasers of 16 KHz sampling frequency,• One vertical accelerometer,• One fiber optic gyrometer,• One pre treatment unit on the beam,• One 19” rack mounted acquisition unit in the vehicle,

SamplingFrom 5mm to few centimeters at all inspection speed.

Profilers on AMAC


Function Longitudinal Profile of AMAC®

Greenwood Profiler

Computer and power supply

Beam with 2 sensors ( one for each wheel track)

under vehicle frame

Profilers on AMAC


Function Transverse Profile of AMAC®

INO / Pavemetrics sensors

Controller box and computer

2 sensors ( one for each wheel track)at the rear of the vehicle

Profilers on AMAC


Profilers WHAT FOR ?


Function Longitudinal Profile of AMAC®Network level processing :

• International Roughness Index IRI, RMS,CP, PSD…• NBO analysis (LCPC) : quality index in 3 bandwidths, grade commonly used in France

Power Spectral Density

IRI expertise on 500m

Samples Distance ( m)Left

Index( m/km)

Right Index ( m/km) Average Speed (km/h)

10000 9165 1.036889 1.401523 73.410000 9695 1.490169 1.843174 72.910000 10195 1.536093 1.605194 71.910000 10695 1.093123 1.401926 72.6



Function Longitudinal Profile of AMAC®Section level processing:Section under rehabilitation or construction

• Quality Control. • Comparison Before / After, sometimes penalties are

applied when specifications are not reached.• Control between different steps (layers) of rehab

or construction to prevent any defect’s amplification.




Wave band analysis



• Roll difference between : adjacent lanes or wheeltracks

• Investigations for special defects.(Finisher’s malfunctions…)




Function Transverse Profile of AMAC®

Transverse profile on AMAC is a laser transverse profile composed of two sensors. Standard configuration two sensors with:

• Coupling laser camera,• high power pulsed near infrared laser diode,• 2 sensors, left and right sensors,• Transversal width view per profile: 1280 points (2*640),• One 19” rack mounted acquisition unit in the vehicle,

Measure Depth accuracy: 1 mm,Effective transversal field of view 3.8 m,



Function Transverse Profile of AMAC®WHAT FOR ? Network level processing

• Rut (left and right) depth used as trigger for rehab,• Rut (left and right) width,• Water ponding depths,

Databases feeding to monitor evolution of :

But also data crossing to analyse and exchange points of view



Function Transverse Profile of AMAC®Section level processing:

• Reprofiling quantitykeeping current crossfall

• Milling quantity to remove before new layer

• Reprofiling withspecific crossfall



Function Transverse Profile of AMAC®• Particular investigations on local sections



Future uses :Longitudinal profile :Megatexture in relation with rolling noise.Macrotexture Transverse profile :multi-lane profileedge drop offMerge longitudinal and transverse profiles

Profilers future use.


Thank you for your attention

Documents

AMAC® More than a Road Profiler - ERPUG · • high power pulsed near infrared laser diode, • 2 sensors, left and right sensors, • Transversal width view per profile: 1280 points