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8/14/2019 Thermography for Resource Conservation
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WELCOME
TO THE PRESENTATION ON
INFRAREDTHERMOGRAPHY
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WHAT IS INFRARED THERMOGRAPHY
The Process of writing involving the use of heat
obtained by an image on a small picture tube by
using INFRARED camera.
All objects in the universe above ABSOLUTE ZERO
(-2730C) emit thermal radiations.
All thermal radiations are in the Infrared region of
electromagnetic spectrum. Infrared thermography allows us to see the
thermal, or heat energy, that is radiated by objects.
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WHY USE INFRARED THERMOGRAPHY
Infrared Thermography allows us to diagnose and
pinpoint problems based on temperature
differential of areas. Temperature provides an
excellent identification of the condition of
equipment.
It is ability of THERMAL CAMERA to see these
early stages of increasing temperature that makesthermography such a valuable technology
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PRINCIPLE
ENERGY LOSS CONDUCTION
CONVECTION
RADIATION
Radiated Energy is a function ofTemperature and Wave length
Almost all energy is radiated in theinfrared band of the electromagneticSpectrum
At 1000oK Energy is radiated in thevisible band
Total Energy Radiated; W = T4
(Stefan-Boltzman Law)
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Radiation Heat Transfer
Thermal Radiation: The Electromagnetic radiation emitted
by a body as a result of its temperature.
Properties: Propagates at speed of light (c)= 3X108 m/sec
Infrared radiation lies from 0.751000 m
Visible light lies from 0.4 0.75 m
Radiative Heat Transfer lies from 0.75 100 m
Most practical measurements can be made upto 20 m
Propagation of Thermal radiation takes place in form of
discrete quanta each quantum having energy of E = h v,
where v - frequency = c/
h is Plancks constant 6.625X10-34 J.s
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Radiation Heat Transfer
Very hot objects radiate in the visible region also.
The Sun at about 6000 0K appears to glow yellow to
white hot
An electric heater / stove at about 800 0K glows red
but as the element cools, it looses its visible glow
but continues to radiate. We can feel the heat with
hand but cant see the glow as the energy has shiftedfrom RED To INFRARED
Weins Displacement Law: pk = 2898 / T , m
Thermal Infrared imagers have measurement
capabilities with sensitivities down to 0.10C
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Electromagnetic Spectrum
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Fundamentals of Radiative Heat Flow
KIRCHHOFFS LAW
TR
A
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PRINCIPLE
ENERGY EMISSIONS
A = Absorbed Energy Black Body: E = 1
R = Reflected Energy Grey Body: E = 0.7-0.9 T = Transmitted Energy
A+R+T = 1
E = A E+R+T = 1
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Radiant Energy Related to Target surface
Stephan Boltzmann Law
W = T4
W = Radiative flux emitted per unit area (W/m2)
= Emissivity (unity for black body target)
= Stefan-Boltzmann constant = 5.673 X 10-8 W/m2 K-4
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INSTRUMENTS
OPTICS
DETECTOR
INDICATOR/DISPLAY
Infrared Thermometers - Spot Radiometers
Line Scanners
Imaging Systems
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FPA Detector Technology
Single DetectorScanning System Linear Focal PlaneArray SystemFocal Plane Array
System
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FPA Thermovision Instrument
-Key features
Choice of hand-held infrared condition
monitoring systems
High resolution FPA image quality for rapid
fault detection
Easy to use
Rugged design for operation in harsh
environments High accuracy and reliability
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Typical Applications
Electrical inspection
Mechanical inspection
Refractory, insulation diagnostics
Energy conservation
Leak detection
Building Insulation
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Refractory diagnostics - Poor insulation
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Leak detection -
Steam line leakage
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Electrical inspection -
220 KV Switchyard (CT Bolts)
Electrical inspection -
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Electrical inspection -220 KV Switchyard (Broken Conductor
Strands)
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Electrical inspection -
Cable Heating
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Electrical inspection Control Panel
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Electrical Inspection-
Low Oil level in Transformer Second Fin
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Mechanical Inspection-
Bearing Problem
M h i l i i
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Mechanical inspection -
Overheating fan
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Building Insulation
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Critical Vessel Monitoring
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Critical Vessel Monitoring
View from East
side
View from West side
GST (217-2260
C)
252.50C
I-
498
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Critical Vessel Monitoring
Thermal Image No.: I-498
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User Industries
and many more...
Electrical Utilities
Iron and Steel
Petrochemical Industry
Automotive
Manufacturing
Consultants
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and many more...
Petrochemical
Industry
Iron and Steel
Electrical Utilities
Automotive
Manufacturing
User Industries
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THANK YOU
HOPE YOU HAVE ENJOYED
THIS PRESENTATION