PAVEMETRICS’s laser road imaging system (LRIS) is composed of two high resolution linescan cameras andlasers that are configured to image 4m transverse road sections with 1 mm resolution at speeds that can reach 100 km/h. This patented imaging system was,designed to increase the contrast and visibility of both small longitudinal and lateral road cracks.

The LRIS optical configuration increases the visibility of even the smallest cracks by using the incident illumination angle of the laser to cause the cracks to project shadows.

Using high power laser line projectors and advanced optics, the LRIS system is very robust to variations in outside lighting conditions and shadows cast by roadside objects, viaducts and the inspection vehicle itself.

KEY FEATURES

• 1 mm imaging at 100 km/h

• Day or night operation

• Crack image contrast enhancement

• Low power consumption

• Compact system

• Water resistant (IP65) housing

specificat ions

• Image size: 4096 pixels/line

• Line rate: 28000 lines/s

• Image width: 4 m (3950 mm nominal)

• Laser class: 3B

• Power: 250W at 120/240 VAC

• Sensor size (approx.): 300 mm(H) x 375 mm(L) x 200 mm(D)

• Sensor weight (approx.): 20 kg

Pavemetrics’s laser rut measurement system (LRMS) is a transverse profiling device that detects and characterizes pavement rutting. The LRMS can acquire full 4-meter width profiles of a highway lane at normal traffic speeds, with 2 options of maximum sampling rate: 30 or 150 Hz. The system uses two 3D laser profilers that digitize transverse sections of the pavement with 1280 points.

Custom optics and high-power pulsed laser line projectors allow the system to operate in full daylight or in night-time conditions. Road transverse profile data can be collected and processed in real time on board the vehicle. Rut extraction algorithms have been developed to automatically measure rut depth and width.

The system is delivered with a complete DLL library of C/C++ functions allowing the user to easily configure the sensors, acquire transverse profiles, extract road rut data, classify rut type (short, multiple, long radius) and validate the laser profiler calibration. Over the past years, this system has been used on a continuous basis by dozens of governments and private agencies. Hundreds of thousands of road kilometers have been surveyed using this technology.

KEY FEATURES

• 1280 point 3D transverse profiles

• Daylight or nighttime operation

• Short integration times for minimal image blur at maximum inspection speeds

• A library of C/C++ functions for easy use and integration

• Proven performance

• Inspection speeds up to 100 km/h

• Rut depth and type (short, multiple and long radius) is evaluated.

BENEFITS

• Immediate and precise detection and characterization

• of rutting conditions

• Optimization of road maintenance funds

• Improvement of safety due to better road

• pavement maintenance

SYSTEM SPECIFICATIONS

• Number of laser profiles: 2

• Number of 3D points per profile (max): 1280 points

• Sampling rate: 30 or 150 profiles/s

• Vehicle speed: 0 to 100 km/h

• Profile spacing: adjustable

• Transversal field-of-view (nominal): 4 m

• Transversal resolution ±2 mm

• Depth range of operation: 500 mm (30 Hz)or 450 mm (150 Hz)

• Depth accuracy (nominal) ±1 mm

• Laser profiler dimensions (approx.):      108 mm(W) x 692 mm(H) x 220 mm(D)

• Laser profiler weight (approx.): 12 kg

• Power consumption (max): 150 W at 120/240 VAC

The laser crack measurement system (LCMS) uses laser line projectors, high speed cameras and advanced optics to acquire high resolution 3D profiles of the road. This unique 3D vision technology allows for automatic pavement condition assessment of asphalt, porous asphalt, chipseal and concrete surfaces. The LCMS acquires both 3D and 2D image data of the road surface with 1 mm resolution over a 4 m lane width at survey speeds up to 100 km/h.

LCMS data is acquired and compressed in real time in the survey vehicle so as to minimize storage needs (<1Gb per km). The collected data can then be analyzed using Pavemetric’s data processing toolbox (DLL library of C/C++ functions). This library has functions to detect and analyze cracks, lane markings, potholes, ravelling, and macro-texture. Rutting is also measured and characterized using more than 4 000 points and rut depth and type (short, multiple, long radius) is evaluated.

Concrete road surfaces can be scanned to evaluate joints, tinning and faulting between the concrete slabs.IMUs can be added to the sensors in order to measure longitudinal profiles, IRI, slope and crossfall.

KEY FEATURES

• Automatic crack detection and severity

• 4 160 point rutting (rut depth, rut type)

• Macro-texture measurements over 100 % of the lane width.

• 3D and 2D data to characterise: cracks, pot holes, ravelling, sealed cracks, joints in concrete, tinning, etc.

• Day and night operation

• Low power consumption

• High resolution (1mm) downward images

• IRI and longitudinal profile

• Slope and crossfall

SYSTEM SPECIFICATIONS

•  Number of laser profiles : 2

• Sampling rate : 5 600 profiles/s or 11 200 profiles/s

• Vehicle speed : 0 to 100 km/h

• Profile spacing : 1 to 5 mm (adjustable)

• Transversal field of view : 4 m

• Transversal accuracy : 1 mm

• Transversal resolution : 4 096 points/profile

• Depth range of operation : 250 mm (adjustable)

• Depth accuracy : 0.5 mm

• Laser profiler dimensions : 428 mm (h) x 265 mm (l) x 139 mm (w)

• Weight : 10 kg

• Power consumption (max) : 150W at 120/240 VAC

The laser foreign object debris (LFOD) detection system uses high speed cameras, custom optics and laser line projectors to acquire both 2D images and high resolution 3D profiles of airport runways, taxiways and aprons in order to automatically detect even the smallest objects at highway speeds.

The LFOD system can be operated both during daytime and nighttime as well as under all types of lighting conditions. Sun and shadows as well as various pavement types ranging from dark asphalt to concrete can be scanned at inspection speeds from 0 to 100km/h. Depending on the configuration selected, an entire runway can be scanned in only a few minutes; automatically detecting FOD as small as 2 mm in size.

FOD and GPS data is collected simultaneously and is analysed in real-time. Alarms can be pre-set to trigger upon detection of FOD of specific sizes or volume. Included software reports size, number and location data for each of the detected debris; thus allowing operations and maintenance personnel to quickly decide whether to remove individual threats or to proceed with a general runway maintenance program.

KEY FEATURES

• Detection of FOD as small as 2mm

• 24 hour operation; day and night-time

• Automated detection; alarms can be pre-set to trigger upon the detection of specific FOD sizes

• Safe and efficient; operational speeds from 0 to 100 km/h

• Flexible configuration; scanning width of 12 m-18 m per pass.

• Cost-effective installation; typically can be mounted on existing inspection equipment

• Accurate; GPS tagging of detected debris

SYSTEM SPECIFICATIONS

• Number of laser profiles : 4 or 6 sensors

• Sampling rate : 11,200 profiles/s

• Transversal field of view : 12-16 m

• Transversal resolution : 1.5 mm

• Vertical accuracy : 1 mm

• Laser profiler dimensions : 428 mm (h) x 265 mm (l) x 139 mm (w)

• Weight : 10 kg

• Power consumption (max): 300W at 120/240 VAC

The Laser Tunnel Scanning System (LTSS) uses multiple high speed laser scanners to acquire both 2D images and high resolution 3D profiles of tunnel linings.

This system can scan a full tunnel vault (24m) at 1mm resolution image and 3D data at acquisition speeds up to 20km/h. Once digitized the tunnel data can be viewed and analyzed offline by operators using multi-resolution 3D viewing and analysis software that allow the high precision measurement of virtually any tunnel feature. Automatic analysis software is available to detect and rate the condition of joints, faulting, cracks, degraded concrete, wet as well as wet and humid area tunnel linings.

The LTSS technology was used to scan high speed TGV rail tunnels such as the 28km long Spanish Guadarrama tunnel in full one millimetre resolution (x,y,z) in just 3 hours. The system was also used to acquire data on the Tokyo Metro System in Japan. Vaults are scanned one half going forward and the second half coming back.

The LTSS is one hundred times faster and 10 times more accurate than typical LIDAR technology. The LTSS can acquire 120,000,000 3D and 2D image points per second at an accuracy of 0.5 mm compared to typical LIDAR accuracies of 5.0 mm for just a few 100,000 points. The standard LTSS configuration (6 sensors) allows for the scanning of a full 12 m of tunnel surface perimeter in a single pass. Larger surfaces can be captured through multiple passes (and the images and data “stitched”) or scanning width can be increased through the addition of sensors.

KEY FEATURES

• Full vault scanning.

• 1mm resolution images and 3D data.

• 100 times faster and 10 times more accurate than lidar scanning.

• Measure tunnel features with sub millimeter accuracy.

• Visualize 1mm surface defects from any point of view without leaving the office.

• Scanning speeds up to 20km/h.

• Automatic analysis software of voussoir type tunnels available.

• Rail scanning options also available.

SYSTEM SPECIFICATIONS

• Number of laser profiles : 6 sensors (standard)

• Sampling rate : 5,000 profiles/s

• Points per profile : 12,000 points (2D and 3D)

• Total sampling rate : 120,000,000 points/s (2D and 3D)

• Transversal field of view : 12m

• Transversal resolution : 1mm

• Vertical accuracy : 0.5mm

• Laser profiler dimensions : 428mm (h) x 265mm (l) x 139mm (w)

• Weight : 10 kg