12-11-2012, 05:25 PM
ADVANCED TECHNOLOGY FOR ROAD DATA COLLECTION
ADVANCED TECHNOLOGY FOR ROAD DATA COLLECTION.pptx (Size: 6.38 MB / Downloads: 74)
INTRODUCTION
Road data is very much necessary for the design of new pavements and also for the maintenance of the existing pavements.
The road data is presently being obtained manually, which is both labor intensive and has personnel safety concerns.
New technology developments have produced a methodology that can quickly inspect roads and streets by using automated inspection equipments.
In this exercise the various advanced technologies that are used for road data collection are discussed.
List of Data Collection Technologies
35 mm Analog Continuous Film
Digital Camera
Digital Line Scan Imaging
Digital DMI
Ground Penetrating Radar
Technologies used in estimating
Rut depths
35 mm Analog Continuous Film
This uses advanced film technology and custom electronics to obtain high resolution, 35 mm film images of the pavement surface
This system consists of a boom-mounted, 35mm slit camera, electronic controller and custom illumination system.
The electronic controller synchronizes the film speed to the speed of the vehicle so that there is no loss in resolution with changes in vehicle speed
DIGITAL CAMERA
This is used to record and quantify the cracks and surface distresses.
This technology uses a digital camera with strobe lighting, the imaging system collects full pavement width of 3.5 meters.
The images are collected at the resolution of 1,300×1,024 pixel in a continuous fashion.
The images are generally collected at night using strobe lighting.
Falling Weight Deflectometers
FWDs are impulse loading devices that apply loadings with a frequency and magnitude very similar to that applied by heavy traffic.
Sensors, or geophones, are used to measure deflections at several points in the deflection basin