PROFILING DEVICES
GeoSolve offers a variety of profiling devices.
The Laser Crack Measurement System (LCMS2) consists of two state of the art Line Laser Profilers, with two high speed cameras and advanced optics enabling it to acquire both 2D images and high-resolution 3D profiles of the pavement surface. The combination of the two cameras covers an area approximately 4 m wide. The sensors operate with a sampling frequency of 28.000Hz. Depending on the selected depth range, they can acquire a transversal profile of the pavement with up to 1 mm resolution while driving at any traffic speed. Each transversal profile is made of 4096 pixels, leading to a resolution of approximately 1 mm.
The LCMS system can operate in all types of lighting conditions, both during day and nighttime, and on a variety of different pavement types including chip seals, thick asphalt and PCC slabs.
The LCMS2 data is synchronized with DMI and GPS information, allowing an accurate positioning of all acquired data. This will also allow the export of every result in a GIS environment.
Thanks to the automatic distress detection the LCMS2 system provides a reliable, objective and repeatable way to assess the pavement surface condition. Its deliverables include the following:
- Cracking
- Rutting (ASTM E1703), shoving and water entrapment
- Macrotexture (MPD and MTD according to ASTM E965 and E1845)
- Roughness (ASTM E950 Class 1 profiler compliant)
- Slope, cross slope and horizontal curvature
- Potholes
- Lane marking
- Concrete joints
These results can be used for Roads and parking lot or Airports Pavement Condition Index (PCI) evaluation according to ASTM D5340 and D6433.
The equipment is calibrated and validated annually ensuring the quality of data meets the NZTA/CCDC stringent specifications
The LCMS2 cameras are currently installed on the Geosolve High Speed Data (HSD) collection device, a sophisticated van that incorporates several state-of-the-art technologies on a single vehicle unit. Each acquisition device is synchronized and connected to a Positioning and Orientation System producing continuous, high accuracy GPS data by means of an Inertial Measurement Unit (IMU) and gyroscopes.
The HSD can operate at any traffic speed and does not require any traffic regulation, road closure or traffic disruption. With a single acquisition at traffic speed the HSD can collect all-relevant pavement surface information, including a high-resolution laser profiling and Right Of Way front camera images. The whole data collection can be handled from inside the van, without the need for our operators to be out on the pavement and exposed to traffic hazards. This makes the HSD survey one of the safest, most affordable and efficient way of collecting pavement data.
Results from the HSD surveys are used to assess the pavement surface status and to plan maintenance activities and repairs, providing an objective way of better allocating budgets and resources. Together with a pavement structural evaluation these results allow for a long-term preventive approach on maintenance which can save money for the road owners and maximize safety and ride quality for the users.
The RSPIV (Road Surface Profilometer Mk IV, mark4) is the portable version of the Dynatest manufactured laser profilers. It is extremely versatile and can be quickly attached to any vehicle, making it the perfect choice for remote surveys. It is equipped with two single-point lasers that scan both wheel paths. The measured road profiles can be used to determine the International Roughness Index (IRI), NAASRA and Boeing Bump Index (BBI).
The profiler can be used to measure roughness at project level or network level investigations. The RSPIV uses a laser and accelerometer to accurately measure the pavement longitudinal profile. Unlike the roughometer and BI Meter the device is vehicle independent, making the results not affected by vehicle type, suspension, tyre pressure and temperature.
The RSPIV is equipped with a “Stop & Go” functionality allowing it to operate in an efficient manner at junctions, traffic lights, roundabouts and any other section where the survey speed must be adapted to the surrounding traffic. This functionality will automatically stop and resume the data collection when the speed drops down to zero minimizing the data loss.
This is currently not used or installed on any of our vehicles. I believe we could so let’s keep it.
The RSPIV is ideal for roughness QA and conformity checks during the pavement construction, on existing pavements or new seals. Roughness results showing IRI and NAASRA are immediately available at the end of run, allowing the site engineer for rapid decision making and providing a summary report showing whether the roughness compliance criteria has been met.
The RSPIV meets the requirement of the TNZ TM 7003v1, AGAM-S001-16 Specification for Pavement Roughness Measurement with an Inertial Profilometer.
