Application of Infrared Thermography for Damare Detction19
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Transcript of Application of Infrared Thermography for Damare Detction19
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APPLICATION OF INFRARED
THERMOGRAPHY FOR DAMAGEDETCTION IN STRUCTURAL
CONCRETE
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INFRARED THERMOGRAPHY
y Regardless of the building type
involved, infraredthermography can provide
remarkable nondestructive
information about construction
details and building performance.
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INFRARED THERMOGRAPHYy Thermography is the use of
an infrared imaging and
measurement camera to"see" and "measure
thermal energy emitted
from an object.
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HEAT LOSS FROM FOUNDATIONy Thermal, or infrared
energy, is light that is not
visible to the human eye.It's the part of the
electromagnetic spectrum
that we perceive as heat.
y
Unlike visible light, in theinfrared world everything
with a temperature above
absolute zero emits heat.
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NEEDS OF INFRARED
THERMOGRAPHYAn accurate
Inexpensive
Non-destructive
Non-labor intensive method
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INFRARED THERMOGRAPHYy Temperature profiling of a surface or point
y Infrared technique
y Black body radiationy Wavelength 0.8m-1000m
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INFRARED IN ELECTROMAGNETIC
SPECTRUM
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OBJECTIVELocating voids
Honeycombing
Plaster voids Interconnection of
carbon-fiber
reinforcement
bituminous sealing onsteel
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SOURCE OF HEAT Artificially applied heat
The suns Radiant heat and thermal effects
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THERMOGRAPHY INSTRUMENT
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THEORY Kirchhoffs law:
= E/Es
Planck radiation law:M (,T)=(2hc2)/(5.( hc/kT-1))
Wien displacement law:
max
=2898/T
Stefan and Boltzmann
I =T4
E= emissivity of a real body
Es=emissivity of the black
body
= emission coefficient=wave length
T= the absolute
temperature
h=the Planck constant
c= the speed of light.
M =the specific spectralradiation
= 5.67x10 -8 W m-2 K-4.
I=radiant power
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CONSTRUCTION THERMOGRAPHYy Emission coefficients MATERIAL
Concrete 0.94
Sand 0.93
Brick 0.93-0.94
Limestone 0.96
Render/plaster 0.90-0.96
Glass 0.93-0.96
Wood 0.96Roofing felt 0.93
Gypsum 0.90
Paint 0.90-0.95
Clay 0.95
Brickearth 0.93
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EXPERIMENT SETUP
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Experimental set-up to perform
thermo-gram
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IMAGE AND TIME LAPSE SPECIFIED
IMAGE NUMBER 1 2 3 4 5 6 7 8
LAPSE TIME Ts in
minutes(t srart=t 0=0)
0 26 90 210 266 354 394
Transit (Tn) steady-
state(Ss)
Tn Tn Tn Tn Tn Tn Ss Ss
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NUMERICAL SIMULATION
3D differential equation of Fourier
Where,
Mass density
Thermal conductivity
Heat capacity Cp
trmpareture T
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THE NUTSAND BOLTSOF DATA
COLLECTION AND REPORTING
y Grouted and non-grouted
y heat and cool
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INFRARED CAMERA
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MISSING INSULATON(CEILING)
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AIR LEACKAGE
LOCATIONEXCESSIVE AIR LEAKAGE CANACCOUNT FOR HALF OF THEENERGY CONSUMED TOCONDITIONED BUILDINGS.
THE PROBLEMS CAN BE AS
STRAIGHTFORWARD AS A FAILEDDOOR WEATHERSEAL
THIS IMAGE IS OF A SLIDINGGLASS DOOR.THE CORNER AT THEADJACENT WALL WAS NOTNSULATED AND THERE WAS POORWEATHER SEALS ON THE DOOR.
NOTE THE TEMPERATUREDIFFERENCE BETWEEN THE WALL77 FTAND THE BOTTOM OF THEDOOR 31.4 F
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MOISTURE
INTRUSION OR
CONDENSATION As building designs and
techniques produce tighter
thermal envelopes, moisture
has created more and more
problems.
The water can intrude
through a small crack and is
then trapped between the
relatively impermeable
building materials.
Good building techniquestypically must deal with
both air sealing and
moisture retarders to keep
moisture from accumulating
insides the wall sections
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CONDENSATION THOUGHT TO BE A
ROOF LEAKCeiling and drywall damage
Condensation where insulationwas disrupted
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ROOFINGy From the looks of this
image it appears that the
roof being surveyed has a
significant amount of wet
insulation; red and yellow
outlined areas.
y Yet in reallity,there was no
wet insulations
throughout the entire
roof.
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CONCRET MASONRY WALL
Photograph of CMU wall
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Thermograph of CMU wall with
improper placement of grout
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Thermographic investigation a heat
bridge with the growth of mold
including a thermo gram
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Localization of the position of floor
heating cables in the living room
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os on o e p pes o a wa
heater, operating with geothermal
heat.
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ADVANTAGESy non-contact
y Fast, reliable & accurate output
y A large surface area can be scanned in no time.y Presented in visual & digital form.
y Software back-up for image processing and analysis.
y Requires very little skill for monitoring.
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NECESSITY IS THE MOTHER OF
INVENTION
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