Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. Space Industry and Business News .




TECH SPACE
GTRI researchers develop prototype automated pavement crack detection and sealing system
by Staff Writers
Atlanta GA (SPX) Jun 20, 2012


This is an example of a pavement crack filled with the prototype automated pavement crack detection and sealing system developed at the Georgia Tech Research Institute. In road tests, the system was able to detect cracks smaller than one-eighth-inch wide and efficiently fill cracks from a vehicle moving at a speed of three miles per hour. Credit: GTRI/Jonathan Holmes.

Sealing cracks in roadways ensures a road's structural integrity and extends the time between major repaving projects, but conventional manual crack sealing operations expose workers to dangerous traffic and cover a limited amount of roadway each day.

To address these challenges, the Georgia Tech Research Institute (GTRI) developed a prototype automated pavement crack detection and sealing system with funding from the Georgia Department of Transportation. In road tests, the system was able to detect cracks smaller than one-eighth-inch wide and efficiently fill cracks from a vehicle moving at a speed of three miles per hour.

"Our prototype system has proved in many ways that a commercial-scale automated crack sealing system is viable," said Jonathan Holmes, the GTRI research engineer currently leading the project, which began in 2003. "We demonstrated solutions to technical challenges - including the high-speed firing of nozzles, automated crack detection and navigation - in a real-time, limited-scale system."

An automated crack sealing system would increase the level of safety for the workers involved, require fewer personnel and increase the amount of roadway covered per day. In addition, the system could save transportation departments money because sealing cracks extends the time before a roadway needs to be completely repaved.

The prototype system, which was mounted on a trailer, consists of a stereo camera, light-emitting diodes (LEDs) of two different colors, and an assembly to provide a continuous supply of sealant to longitudinal and transverse sealant distribution systems. The operation required only one worker to drive the vehicle pulling the trailer.

As the system traveled along a road lane, the LEDs illuminated the road in two directions - parallel and perpendicular to the road - and the stereo camera took two pictures of the road simultaneously, which were analyzed using thresholding and filtering algorithms. Within 100 milliseconds of taking the images, the computer onboard the trailer generated a "crack map" specifying the location and shape of any cracks shown in the images.

Based on the cracks found in the image, the master controller instructed the sealant applicator valves when to fire. To fill longitudinal cracks, a single dispensing nozzle capable of continuous operation was attached to a linear servo axis. The transverse sealant distribution system consisted of 12 nozzles spaced evenly across one foot. The transverse and diagonal distribution prototype was intended to represent one module that could be replicated and joined together to service a full-width roadway lane.

In multiple road tests, the prototype system proved to be a successful proof-of-concept for the automation of crack sealing operations.

Before a full-scale system can be successfully implemented by transportation departments, several issues must be addressed, according to Holmes. First, the crack detection algorithm will need to be improved. The researchers tested their crack detection algorithm on more than 100,000 images they collected of cracks on state roads and found the program correctly identified more than 83 percent of the cracks.

"Our crack detection algorithm was limited because we used a vision-based system, which was confounded by regions of high contrast caused by features other than pavement cracks, including dark stains in the pavement, lane stripes, raised-pavement markers, crack sealant and debris," said Holmes. "A full-scale system may require a fusion of multiple imaging sensors, such as a 3-D laser scanning system."

Holmes also suggested changes will be necessary in the way the sealant was supplied to the longitudinal and transverse distribution systems before a full-scale system can be realized.

David Jared, acting chief of research and development at the Georgia Department of Transportation Office of Materials and Research, and GTRI principal research engineers Wayne Daley and Wiley Holcombe, research scientist Colin Usher, and research engineers Sergio Grullon and Steven Robertson also worked on this project.

.


Related Links
Georgia Institute of Technology Research News
Space Technology News - Applications and Research






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





TECH SPACE
Ionic liquid improves speed and efficiency of hydrogen-producing catalyst
Richland, WA (SPX) Jun 20, 2012
The design of a nature-inspired material that can make energy-storing hydrogen gas has gone holistic. Usually, tweaking the design of this particular catalyst - a work in progress for cheaper, better fuel cells - results in either faster or more energy efficient production but not both. Now, researchers have found a condition that creates hydrogen faster without a loss in efficiency. And, ... read more


TECH SPACE
Malaysia rare earths plant gets go-ahead

All the colors of a high-energy rainbow, in a tightly focused beam

GTRI researchers develop prototype automated pavement crack detection and sealing system

Ionic liquid improves speed and efficiency of hydrogen-producing catalyst

TECH SPACE
Boeing FAB-T Demonstrates Communications with On-orbit AEHF Satellite

Lockheed Martin Completes Environmental Testing on Second US Navy Satellite

Raytheon receives contract to link Navy Multiband Terminal to USAF's Polar Satellite

Raytheon receives $79 million award for US Navy Multiband Terminal systems

TECH SPACE
A milestone in launcher preparations for Arianespace's fourth Ariane 5 flight of 2012

US military launches new satellite into space

NASA Administrator Bolden Views Historic SpaceX Dragon Capsule

NASA's NuSTAR Mission Lifts Off

TECH SPACE
Trial by vacuum brings next Galileo satellites closer to launch

Boeing Completes Fifth GPS IIF Satellite for USAF

GPS being used as weather forecast tool

Apple fends off Android challenge with maps, Siri

TECH SPACE
Boeing Named Associate Partner to SELEX Sistemi Integrati in Single European Sky ATM Research Development Phase

Jetstar Japan chief says no threat to JAL's revival

Embraer ups components output in Portugal

Norway orders first two F-35 fighters as part of $10bn deal

TECH SPACE
Renesas shareholders approve $630 mn in aid

Quantum bar magnets in a transparent salt

Researchers 'heal' plasma-damaged semiconductor with treatment of hydrogen radicals

Relocating LEDs from silicon to copper enhances efficiency

TECH SPACE
Anniversary in space - five years of TerraSAR-X

Embedded Educators: Teacher Research Experience in Greenland with Operation IceBridge

Google launches cultural map of Brazil's Amazon tribe

Indra Incorporates Rapideye Satellite Capacity Into Its Earth Observation Service

TECH SPACE
New Software Forecasts Noise Levels in a Street

Red Cross sounds alarm about weapon contamination

UN environment summit opens, but prospects grim

Rights group slams 'lawless' Indian mining industry




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement