Talon Research, Inc - Local technical assistance programmichiganltap.org/sites/ltap/files/workshops/materials/Bridgeguard.pdf · Talon Research, Inc Gary Howard Jay Ruohonen March

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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


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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


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Buried Anti-Personnel Mine

Obscured Surface Bomb

•Airborne Detection of Buried/Surface Ordnance


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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.


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Data Collection with Driver and Single Operator

Field of View Covers Full Lane


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Example Bridge De-laminationsDe-laminations

De-laminations

Images Taken with 1996

Vintage Technology


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


Created with guidance from Center of

Structural Durability and the Transportation

Institute at Michigan Technological

University, Theresa M. Ahlborn Ph.D., P.E.

Director.


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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


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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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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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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

[email protected]


Talon Research, Inc - Local technical assistance programmichiganltap.org/sites/ltap/files/workshops/materials/Bridgeguard.pdf · Talon Research, Inc Gary Howard Jay Ruohonen March

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