ROMEN CATCHER LY
Flying spot method enables detection of road cracks at high speed
Due to the flying spot method which utilizes a laser, all cracks 1mm or more in width are recorded while travelling at high speeds of up to 80km/hour.
Optical shut-off method provides precise data concerning rutting
An optical shut-off measuring method is utilized which uses a CCD camera to record the images reflected from the laser beam that scans the road from directly above. The gathered imaging data is automatically analyzed by a real-time dedicated image processor to provide precise data regarding ruts.
Automatic analysis of high accuracy roughness data using non-contact displacement gauges
The height from the road surface is detected using the reflection of the laser beam shining from directly above, and is recorded on video while superimposing the distance signals. Automatic analysis is carried out by a real-time dedicated image processor to provide high accuracy data concerning the roughness.
Provision of IRI data concerning the ride comfort as seen from the viewpoint of road users
Longitudinal section profile data gathered from acceleration gauges and laser displacement gauges is recorded, and IRI (International Roughness Index) data is provided which is used for evaluating the ride comfort.
Daytime and nighttime measurement (Cracks, ruts, roughness, IRI, forward imaging, and GPS)
|Item||Designated precision||Measured precision||Remarks|
|Cracks||Possible to recognize cracks of 1mm or more in width||Possible to recognize cracks of 1mm or more in width||Measured width 4.0m|
|Ruts||Within ±3mm in relation to the cross-section profile meter||Within ±3mm in relation to the cross-section profile meter||Cross section: 10mm
Longitudinal section: 250mm
|Roughness||Within ±30% in relation to the longitudinal profile meter||Within ±30% in relation to the longitudinal profile meter||OWP position
Measured interval 50mm
|IRI||—||—||Measured interval 50mm
Acceleration gauge + laser displacement system
|Distance||Within ±0.5% of actual measured value||Within ±0.3% of actual measured value||Measured interval 1mm|
|Forward imaging||—||—||Vertical 960 x horizontal 1280 pixels|
|GPS (Coordinate acquisition)||—||—||Car navigation system type: 1Hz output|