Advanced non contact profiler improving the quality of pavement profile measurement
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Advanced Non-contact Profiler Improving the Quality of Pavement Profile Measurement. Research Point. 1. Inertial Profiler is fast , but distorts roughness value. 2. Walking profiler is too slow , but can get undistorted profile. Walking Profiler: Max 4km/h (Normal : 2km/h).

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Advanced non contact profiler improving the quality of pavement profile measurement

AdvancedNon-contact ProfilerImproving the Quality of Pavement Profile Measurement


Research point
Research Point

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

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

Walking Profiler: Max 4km/h

(Normal : 2km/h)

Dipstick : Max 0.5 km/h

Reference : Boeing Runway Roughness Criteria, 2006


Idea creating panorama images
Idea : Creating panorama Images

A

D

B

Panorama image

E

C

Partial Images


Technology
Technology

Partial Profile

D

A

B

E

C

A

C

E

Total Profile

1

2

3

4

A

B

C

D

E

3

3

1

1

2

2

4

4

L

B

D


Technology1
Technology

High Resolution Digital Camera

Infra Red

LaserLine Projector

Captured Image

Image Processing

RUNWAY

Profile

(numerical data)


Test device
Test Device

Pseudo pavement

Digital Camera

Laser

Line Projector


Test device1
Test Device

Laser Power Controler

Laser

Line Projector

PC

Battery

Digital Camera

Encoder

AC Invertor


Device specifications
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


Preliminary test
Preliminary test

Pedestrian Sidewalk

About 10cm (4 inch)

Profile data



Preliminary test1
Preliminary test

Grooving at Runway

Captured Image

overlap

50cm (20 inch)


Panorama profiler
Panorama profiler

Digital Camera

Laser Projector

DMI


Panorama profiler1
Panorama profiler

Laser Projector

1m

Image capture


Test

Test Site

Walking Profiler

Speed bump

294m

Test Unit(Test speed : 40km/hr)


Test result
Test Result

Cross correlation : 83.4% (IRI filter)

Panorama Profiler

Walking Profiler


Test result1
Test Result

Cross correlation : 60.1% (None filter)

Panorama Profiler

Walking Profiler

Speed bump

Speed bump


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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