This presentation provides an overview of infrared thermography (IRT), including its history, working mechanism, advantages, limitations, and applications. IRT is a non-destructive technique that uses infrared radiation to detect and display thermal patterns and temperature values across surfaces. It was developed starting in the 1700s and has increasingly been used for applications like non-destructive testing, surveillance, research, and energy conservation due to benefits like being non-contact, fast, and able to scan large areas in real-time. While useful, IRT also has limitations like higher costs than contact methods and inability to detect interior temperatures through some materials. In summary, the presentation outlines the fundamentals and increasing uses of IRT as an emerging

1. A Presentation on
Application of Thermography.
Prepared By: Pramod Rijal (074BCE107)
IOE, Pulchowk Campus,
Pulchowk, Lalitpur.
Date: 14th January 2019

2. Overview
 This presentation deals with the description, application and
advancements related to the field of “Infrared Thermography”

3. Contents:
 Introduction
 History and development
 Reason behind the emerging technology?
 Working Mechanism
 Advantages of IRT
 Limitation of IRT
 Images of IRT application.
 References
 Queries..

4. Introduction :
1. Infrared Thermography is the newest non-destructive method that use
invisible infrared rays as a medium to detect and display thermal
patterns and temperature values across a given surfaces.
2. It is based on the fact that all objects above zero kelvin emits infrared
radiation which isn’t visible to human eyes.
3. The photography taken by this device can be capture in real time to
video tape or PC or any other electronic media for post analysis

5. Development
 1737: Émilie du Châtelet predicted what is today known as infrared radiation.
 1830: Leopoldo Nobili made the first thermopile IR detector.
 1840: John Herschel produces the first thermal image, called a thermogram
 1905: Albert Einstein developed the theory of the photoelectric effect.
 1935: Lead salts – early missile guidance in World War II.
 1938: Yeou Ta predicted that the pyroelectric effect could be used to detect
infrared radiation.

6. Reasons for being the emerging technology.
 It is non-contact, non-destructive process that use remote sensing.
 The image obtained allow for excellent overview of the target and
thermal pattern can be visualize for analysis.
 It is real time i.e enables fast scanning of stationary targets ,can capture
high moving objects, and can capture fast changing thermal pattern.

7. Continue…
 It can be used for night vison purposes as well.
 It emits no harmful rays
 It can be used as preventive, predictive, condition monitoring,
research and development and quality assurance.

8. Infrared Radiation
 In an electromagnetic spectrum the IR region appears between .8 micron to 1000
micron wavelength

9. Characteristics of IR
 It is emitted by all body with temperature greater than zero kelvin.
 It can be transmitted through vacuum.
 There is a correlation between infrared energy and temperature of an
object. So, we can predict the temperature of an object.

10. Continue..
• Rayleigh–Jeans Law
• Planck’s law
• Wien displacement law
• Stefan boltzman law
which describes the spectral brightness of black-
body radiation as a function of wavelength at any
given temperature.

11. Thermographic devices
A thermal imaging camera consists of five components:
i. Optics System
ii. Detector
iii. Amplifier
iv. Signal processing
v. Display
• Small lens focuses the infrared light emitted by source and
passes to the detector. This detector creates thermogram.
• This thermogram is translated into electric impulse which
then sent to signal-processing unit to give digital image.

12. Working Mechanism

13. Advantages of IRT
It is non contact technique
It is fast, accurate and reliable
Large area can be scanned in no time
IT is capable of catching the moving targets in real time.
It can present and store data in visual and digital form

14. Limitation of IRT
1. Cost of instrument is relatively high.
2. Unable to detect the inside temperature if the medium is
separated by glass or polythene material.
3. Most camera have the accuracy of +-2%. So It mayn’t be as
much accurate as direct contact method.
4. Condition of work:
I. 10degree Celsius difference between internal/ external, max
10km/h wind speed, no direct sunlight, no recent rain.

15. Applications:
1.Building
2. Surveillance in security, can be used by fire-fighter.
3. Non destructive testing
4. Research
5. Minimizing risk (animals attack)
6. Night Imaging

16. Non-Destructive testing

17. References:
 Kalpan,Herbert: ASTN Level III Study Guide on infrared and thermal testing method.
 http://en.Wikipedia.org/wiki/Thermal _imaging _camera
 S.P Garnaik: Infrared thermography: A versatile Technology for condition and monitetoring
and Energy Conservation.
 Antonia Moropoulou*, Nicolas P. Avdelidis, Maria Koui, Ekaterini T. Delegou, Theodora
Tsiourva National Technical University of Athens, Department of Chemical Engineering,
Section of Materials Science and Engineering, Iroon Polytechniou 9, 1 5780 Zografou,
Athens, Greece. Infrared thermographic assessment of materials & techniques for the
protection of cultural heritage

18. Thank You!!