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1 Talon Research, Inc Gary Howard Jay Ruohonen March 24, 2010 Using Thermal IR Imaging to Identify De- laminations in Bridge Decks (906) 483-2679 • [email protected] • www.BridgeGuard.net
1
Talon Research, IncGary Howard
Jay Ruohonen
March 24, 2010
Using Thermal IR
Imaging to Identify De-
laminations in Bridge
Decks
(906) 483-2679 • [email protected] • www.BridgeGuard.net
Development of a vehicle mounted infrared (IR) optical
system, coupled with application specific software to
accurately collect, analyze, map, report and database
results for bridge deck de-lamination.
Technology Statement
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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• Developed in 1996
See April 1996 issue of Roads
and Bridges Magazine
• Advanced The System in 2009
Advances in Sensor Systems
Advances in Software Tools
Maturing of System Development
Employing GPS.
• ASTM D4788-03 (1980)
History of the BridgeGuard Development
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Automation Software Based on Unexploded
Ordnance (IED) Applied Research
•Airborne Detection of Buried/Surface Ordnance
(906) 483-2679 • [email protected] • www.BridgeGuard.net
5
Buried Anti-Personnel Mine
Obscured Surface Bomb
•Airborne Detection of Buried/Surface Ordnance
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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Augment and Cooperate with Current Procedures
•Use IR as an early detection or Scoping Tool
before employing other more time consuming and
costly evaluation methods.
•No Lane Closings – Highway Speeds
Does not impede the flow of commerce.
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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Data Collection with Driver and Single Operator
Field of View Covers Full Lane
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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Example Bridge De-laminationsDe-laminations
De-laminations
Images Taken with 1996
Vintage Technology
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9 Second Law Of Thermodynamics
How Does it Work?
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How Does it Work?
Second Law Of Thermodynamics
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As the 1996 system re-design
process began, it was decided that
a simulation of a bridge deck
would be developed to:
•Validate and illustrate the theory
• Initiate empirical predictions of what
can be seen by a thermal sensor, when,
and how deep (support 1st principal
model)
•Use as a training tool for future users of
the technology
(906) 483-2679 • [email protected] • www.BridgeGuard.net
Created with guidance from Center of
Structural Durability and the Transportation
Institute at Michigan Technological
University, Theresa M. Ahlborn Ph.D., P.E.
Director.
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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A simulated concrete bridge
deck test slab was built to gather
diurnal test data under variable
environmental conditions.
Size: 3’ x 6’ x 11”
8 Bag DOT Mix
10 known and mapped defects
Rebar placement
5 Thermocouples
Thermocouple Placement
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125 4 3
67891011
1 inch from Top Specimen #1: 6x6 Styrofoam Specimen #10: trash bag Specimen #11: pencil
3 inch from Top Specimen #2: 6x6 Styrofoam
5 inch from Top Specimen #3: 6x6 Styrofoam Specimen #8: plywood
7 inch from Top Specimen #4: 6x6 Styrofoam Specimen #7: cardboard
7.5 inch from Top Rebar Structure
9 inch from Top Specimen #5: 6x6 Styrofoam Specimen #6: pop can
Bridge Deck Simulator
(906) 483-2679 • [email protected] • www.BridgeGuard.net
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Diurnal Thermal Imagery Results
Starting Time: 1430 hrsAugust 13, 2009Hancock, MI
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Daylight/Solar Hours Thermal Crossover
0915 hours 1600 hours
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0300 hours2145 hours
Night-time/Non-Solar Hours Thermal Crossover
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Specimen 1: Delta-T from Background Mean
Chart Title
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% C
on
tras
t
Diurnal #1
Diurnal #2
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Temperature Values Recorded Into the Slabs
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Importance of Temperature Depth Seen in the Previous Plot:
Portable Camera Operation at the Bridge Underside
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2121
Blacktop Covered Manhole
Image Underscores
Versatility of the
Technology
Can the system detect under a
blacktop overlayment?
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Summary:
Provides an Opportunity to Augment the Standard in Bridge
Deck Evaluation and to Extend the State-Of-The-Art Toolbox
in Bridge Test Protocol.
www.talonresearch.com
Contact: Jay Ruohonen
906-483-2679
(906) 483-2679 • [email protected] • www.BridgeGuard.net
