ThermographyTesting – NonDestructive Testing Method that
involves visualization of heat radiations from an object and the method
is a non contact inspection technique, .
It is also simply called as IR – Infrared Thermography, Thermal Imaging technique or Thermography.
Principle of Infrared Thermography Testing.
Infrared Thermography Sensors capture Infrared radiation from any
object which is above absolute zero temperature (-273.15°C), and
displays on screen as -heat distribution images, any defective areas
emits more heat due to more heat distribution around the defects.
What is Infrared Wave?
Infrared are Electromagtic Radiation similar to Light Radiation, but
are not visible to human eyes , becauses of their longer wavelength, the
wave length of which is longer than Red (i.e 700 nm) is called Infra
Red( i.e Inferior Frequency than Red Light),
Amount of Infrared Radiation captured is equal to the heat dissipated
from that area, therefore the IR cameras can be used to capture images
of heat distribution.
Thermography can be classified into different types as below
- Passive Thermography
- Active Thermography
- Flash Thermography
- Vibro Thermography
Passive Thermography.
It involves scanning the Component during its operation or
Immediately after operation (ex. Running motor shaft) , It does not
requires an external Heat source for heating, it uses the heat heat
generated in the material during its operation.
Active Thermography.
The method requires an external heat source to heat the component and monitors the flow of heat inside the material.
Flash Thermography
Uses flashes of light , to identify the discontinuities that obstruct the flow of heat inside the material.
Vibrotheremography
This method uses a acoustic sound source, and a hermography sensor to
detect the heat distribution inside the material, the acoustic sound
vibration causes more heat at the edges of cracks due to friction during
vibration.
Applications of Thermography:
The Infrared Thermography has vast applicable fields,
- Medical
- Security Screening
- Forensic Sciences
- Electrical Connections and instrumentation
- Civil Stuctures
- Rotary Equipments
- Loaded Structures
- Automobile industry
- Aerospace Structures and More……
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