thermography for resource conservation

8/14/2019 Thermography for Resource Conservation

1/32

WELCOME

TO THE PRESENTATION ON

INFRAREDTHERMOGRAPHY


2/32

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.


3/32

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


4/32

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)


5/32

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


6/32

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


7/32


8/32

Electromagnetic Spectrum


9/32

Fundamentals of Radiative Heat Flow

KIRCHHOFFS LAW

TR

A


10/32

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


11/32

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


12/32

INSTRUMENTS

OPTICS

DETECTOR

INDICATOR/DISPLAY

Infrared Thermometers - Spot Radiometers

Line Scanners

Imaging Systems


13/32

FPA Detector Technology

Single DetectorScanning System Linear Focal PlaneArray SystemFocal Plane Array

System


14/32

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


15/32

Typical Applications

Electrical inspection

Mechanical inspection

Refractory, insulation diagnostics

Energy conservation

Leak detection

Building Insulation


16/32

Refractory diagnostics - Poor insulation


17/32

Leak detection -

Steam line leakage


18/32


19/32

Electrical inspection -

220 KV Switchyard (CT Bolts)



20/32

Electrical inspection -220 KV Switchyard (Broken Conductor

Strands)


21/32


Cable Heating


22/32

Electrical inspection Control Panel


23/32

Electrical Inspection-

Low Oil level in Transformer Second Fin


24/32

Mechanical Inspection-

Bearing Problem

M h i l i i


25/32

Mechanical inspection -

Overheating fan


26/32

Building Insulation


27/32

Critical Vessel Monitoring


28/32


View from East

side

View from West side

GST (217-2260

C)

252.50C

I-

498


29/32


Thermal Image No.: I-498


30/32

User Industries

and many more...

Electrical Utilities

Iron and Steel

Petrochemical Industry

Automotive

Manufacturing

Consultants


31/32

and many more...

Petrochemical

Industry

Iron and Steel

Electrical Utilities

Automotive

Manufacturing

User Industries


32/32

THANK YOU

HOPE YOU HAVE ENJOYED

THIS PRESENTATION

thermography for resource conservation

Documents