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Compact laser system scans road surfaces at 100 km/h

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May 1, 2013

Cars and lasers, together again (Photo: pop culture geek)

Cars and lasers, together again (Photo: pop culture geek)

Image Gallery (2 images)

Researchers at the Fraunhofer Institute for Physical Measurement Techniques have come up with a car-mounted laser scanner the size of a shoe box, that can survey the contours of road surfaces at speeds of up to 100 km/h (62 mph). The system detects potholes and other road damage in need of repair. According to the Institute, the Pavement Profile Scanner (or PPS) has surveyed 15,000 km of road since mid-2012, in which time it has proven cheaper, faster and more accurate than existing systems which require hefty attachments to the carrier vehicle.

An octagonal mirror housing scatters the laser light across the width of the road. With a 70º acquisition angle, the system can scan roads up to 4 m (13 ft) wide. By recording the time it takes for the laser to return to the scanner from the road surface, the distance at any point can be calculated; to an accuracy between 0.15 and 0.3 mm in the case of PPS. The only other information needed is the vehicle's position and orientation as a reference for each datapoint. It's LIDAR, basically.

It is hoped that PPS and similar system could save authorities significant amounts of money by catching superficial road damage before underlying layers are affected. Fraunhofer asserts that roads amount to over 60 percent of the capital assets of many towns and cities in Germany.

Fraunhofer's actual image of its road-scanning laser technology
Fraunhofer's actual image of its road-scanning laser technology

Though the technology is still in development, it has already met the safety requirements of The Federal Highway Research Institute. "It not only had to be accurate to 0.3 millimeters, it also had to be safe for the eyes," said Dr. Dirk Ebersbach, CEO of Lehmann + Partner, which conducted the road surveys. "This means that even if someone ended up looking into the laser for longer than necessary, it would not put their eyes at risk. The development partners' technology easily cleared both hurdles."

The current system operates at a frequency of 1 MHz, so it's capable of taking 1 million measurements every second. With the prototype now in development, the researchers have upped the frequency to 2 MHz. This should be enough to detect cracks in the road surface, which could allow road maintenance crews to prevent subsequent damage at an even earlier stage.

As we've reported previously, auto makers are also turning to LIDAR to help with the development of autonomous cars.

Source: Fraunhofer

About the Author
James Holloway James lives in East London where he punctuates endless tea drinking with freelance writing and meteorological angst. Unlocking Every Extend Extra Extreme’s “Master of Extreme” achievement was the fourth proudest moment of his life.   All articles by James Holloway
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7 Comments

This could prove to be a game-changing technology.

Racqia Dvorak
1st May, 2013 @ 02:50 pm PDT

Looks a lot like what ARRB has been making for over 10 years:

http://www.arrb.com.au/Equipment-services/Hawkeye-2000-Series.aspx

Damien
1st May, 2013 @ 06:40 pm PDT

Damien,

They never claimed to be the first. Their claim is that "it has proven cheaper, faster and more accurate than existing systems which require hefty attachments to the carrier vehicle." Presumably, that includes the Hawkeye.

Gadgeteer
1st May, 2013 @ 11:37 pm PDT

So they finally made KITT

Toffe Kaal
2nd May, 2013 @ 01:13 am PDT

This is something Google could fund/buy to improve Google Maps... pothole avoidance systems!

John Lacson
2nd May, 2013 @ 03:21 am PDT

I would think the accuracy could be improved further by having the set-up at he front of the moving vehicle, before the suspension disturbs the truck ride height. Thinking back of the school bus bouncy ride with the larger overhang. Furthermore it could factor out the uneven surface as the suspension reacts once the vehicle reaches that point.

Bob Flint
2nd May, 2013 @ 09:26 am PDT

I like the fact that it can read a 13-foot swath, which will easily cover an entire lane of traffic. It looks like the Hawkeye is limited to the width of the rather ungainly-but-not-all-that-wide sensor unit.

Bruce H. Anderson
2nd May, 2013 @ 12:49 pm PDT
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