Ground Penetrating Radar : Basic and Applications for Civil Engineering
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Transcript of Ground Penetrating Radar : Basic and Applications for Civil Engineering
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Ground Penetrating RadarBasic for Civil Engineering
2014. 04. 17
GPR Basic for Master’s Course
Jiyoung RheeEngineer Researcher
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What is RADAR?
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RADAR?
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RADAR? No! Laser
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RADAR
Surveillance(Search) Radar (Army/Aiport)http:// www.naval-technology.com
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RADAR
Weather Radar http://www.kma.go.kr/
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RADAR
3 Dimensional Radar(TRMM PR) [Hurricane Sandy, Oct. 28, 2012 at 1725 UTC (1:25 PM EDT)]http://trmm.gsfc.nasa.gov/ 8/45
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RADAR
Navigationhttp://www.nauticexpo.com/
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RADAR
• Radio Detecting And Ranging
• An object-detection system
that uses radio waves to
determine the range, altitude,
direction, or speed of objects.
http://en.wikipedia.org/10/45
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RADAR
http://en.wikipedia.org/
Principle of a Sonar or Radar Distance Measurement11/45
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G P R ?
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Ground
Penetrating
Radar
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Ground Penetrating Radar
• A geophysical method that
uses radar pulses to image the
subsurface.
• This nondestructive method
detects the reflected signals from
subsurface structures. http://en.wikipedia.org/
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Ground Penetrating Radar
• GPR can be used in a variety of
media, including rock, soil, ice,
fresh water, pavements and
structures.
• It can detect objects, changes in
material, and voids and cracks.http://en.wikipedia.org/
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Ground Penetrating Radar
Deterioration
Approach
Thickness
Pavement
Sink hole
Rebar
Tunnel
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Definitions!
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Dielectric Constant• Dielectric Permittivity is the
property that describes the ability of a material to store electric energy by separating opposite polarity charges in space. (units : farads/metre(F/m))
• Relative dielectric permittivity (dielectric constant) is the ratio of the permittivity of a material to that of free space, 8.854×10−12 F/m. (No unit!)
ASTM D 6432 – 11 3.2.918/45
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Electrical Conductivity
• The ability of a material to
support an electrical current
(material property that describes the
movement of electrons or ions) due
to an applied electrical field. (units :
Siemens/metre (S/m)).
ASTM D 6432 – 11 3.2.519/45
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Electrical Properties
Approximate Electromagnetic Properties of Various Materials
ASTM D 6432 – 11 Table 1 20/45
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Survey & Analysis
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Data Acquisition
ASTM D 6432 – 11 Fig 1.
Schematic Diagram of a Ground-Penetrating Radar System22/45
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Data Acquisition
• GPR uses high-frequency radio
waves and transmits into the ground.
• When the wave hits a buried object
or a boundary with
different dielectric constants, the
receiving antenna records variations
in the reflected return signal.
http://en.wikipedia.org/23/45
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Data Acquisition• The depth range of GPR is limited by
the electrical conductivity of the ground, the transmitted center frequency and the radiated power.
• As conductivity increases, the penetration depth decreases.
• Higher frequencies do not penetrate as far as lower frequencies, but give better resolution.
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Data Acquisition
ASTM D 6432 – 11 Fig 1.
Schematic Diagram of a Ground-Penetrating Radar System
Soil
Buried Object
Bed Rock
TransmitterAntenna
ReceiverAntenna
Control Unit
DataDisplay
DataStorage
Ground Surface
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Data Acquisition
ASTM D 6432 – 11 Fig 1.
Schematic Diagram of a Ground-Penetrating Radar System
Soil
Buried Object
Bed Rock
TransmitterAntenna
ReceiverAntenna
Control Unit
DataDisplay
DataStorage
Ground Surface
t1
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Data Acquisition
ASTM D 6432 – 11 Fig 1.
Schematic Diagram of a Ground-Penetrating Radar System
Soil
Buried Object
Bed Rock
TransmitterAntenna
ReceiverAntenna
Control Unit
DataDisplay
DataStorage
Ground Surface
Different EM Properties
t1 t2
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Data Acquisition
ASTM D 6432 – 11 Fig 1.
Schematic Diagram of a Ground-Penetrating Radar System
Soil
Buried Object
Bed Rock
TransmitterAntenna
ReceiverAntenna
Control Unit
DataDisplay
DataStorage
Ground Surface
Different EM Properties
t1 t2
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Received Data
ASTM D 6432 – 11 Fig 1.
Soil
Buried Object
Bed Rock
TransmitterAntenna
ReceiverAntenna
Control Unit
DataDisplay
DataStorage
Ground Surface
t1 t2
A1
A2
A Trace
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Data Analysis
• Depth
ASTM D 6432 – 11 Eq. (1)
mVt
d 2
r
m
cV
- c = propagation velocity in free space(3X108m/s)- Vm = propagation velocity through the material- εr = relative permittivity
A Trace
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GPR Survey & Analysis
A Series of Traces
Depth
1 2 3 4 5
Survey
Tim
e
1 2 3 4 5
Survey
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Point Reflector
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GPR Survey & Analysis
A Series of Traces
Depth
1 2 3 4 5
Survey
Tim
e
1 2 3 4 5
Survey
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Line Reflector
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GPR Survey & Analysis
Wiggle Trace Linescans
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Investigation
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Rebars in a Concrete Pavement
Linescans Wiggle Trace
Surface
Rebars
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Layer Thickness at Bridge Deck
A/C
RebarsBottom
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Subsidence near the Dongtan IC
Patching
Subsidence
B=1.2m
Grouting
Patching
Grouting
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Cultural Treasure in Gyeongju
http://news.dongascience.com/PHP/NewsView.php?kisaid=20120810200002327242
Gyeongju Wolseon, Gyeongsangbuk-do
Seokb
ing
go
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Press News
http://www.yonhapnews.co.kr http://www.e2news.com
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Press News
http://www.joins.com http://www.segye.com
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Now & the Future?
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Now : Research
2012 GPR Conference 42/45
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Now : Equipment
2012 GPR Conference
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Now : Software
2012 GPR Conference
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The Future
http://cait.rutgers.edu
The Robot for Bridge Deck Assessment
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Question?
Jiyoung RheeMobile : 031-371-2761
Mailto : [email protected]
http://www.slideshare.net/ssuser6b53da