KOREA AIRPORTS CORPORATION & ROADTECH

Advanced Non-contact ProfilerImproving the Quality of Pavement Profile Measurement

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KOREA AIRPORTS CORPORATION & ROADTECH

Research Point

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1. Inertial Profiler is fast, but distorts roughness value.

Walking Profiler: Max 4km/h (Normal : 2km/h)

Dipstick : Max 0.5 km/h

Reference : Boeing Runway Roughness Criteria, 2006

2. Walking profiler is too slow, but can get undistorted profile.

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Idea : Creating panorama Images

Partial

Images

A BC

D E

Panoram

a im

age

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Technology

A

B

C

D

E

1 2 3 4

L

Total

Profile

A B DC E

1 1 2 2 3 3 4 4

Partial

Profile

A B CD E

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Technology

5

Infra RedLaser Line Projector

High Resolution Digital Camera

Profile(numerical data)

Captured Image

Image Processing

RUNWAY

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Test Device

Pseudo pavement

LaserLine Projector

Digital Camera

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PC

Battery

AC Invertor

Encoder

Test Device

Laser Power Controler

Digital Camera

LaserLine Projector

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Device Specifications

Digital Camera

Resolution : 2048 by 1088 @ 280 frame/Sec

Lens : 6.5 forcal Length Non Distortion Lens (With IR Band-Pass Filter)

Laser Projector

Didode Power : 10W

Wavelength : 808nm

Spread angle : 50°

Line width : >1mm

DMI (Distance Measurement Unit)

Pulse : 2048/cycle

Distance Resolution : 1mm

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Preliminary test

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Pedestrian Sidewalk

About 10cm (4 inch)

Profile data

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Preliminary test(airport)

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KOREA AIRPORTS CORPORATION & ROADTECH

Preliminary test

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Grooving at Runway

Captured Image

50cm (20 inch)

overlap

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Panorama profiler

Digital Camera

Laser Projector

DMI

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Panorama profiler

Image capture

Laser Projector

1m

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Test

Speed bump29

4m

Test Site Walking Profiler

Test Unit(Test speed : 40km/hr)

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Test Result

Cross correlation : 83.4% (IRI filter)

Walking Profiler

Panorama Profiler

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Test Result

Cross correlation : 60.1% (None filter)

Walking Profiler

Panorama Profiler

Speed bump

Speed bump

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Plan

Revise

Image distortion

Profile extraction algorism(nonfiler)

Improve

Repeatability(over 92%)

Goal

Speed of operation : Minimum 40 km/h (25 mi/h)

Sampling rate (longitudinal interval) : 2mm (0.08 inch)

Resolution (Vertical) : ± 1mm (0.04 inch)

Correlation : Over 90% (Basis Walking Profiler)

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Thank you