2. What is Thermography?
Infra Red Thermography is a technique for
producing a visible image of invisible (to our eyes)
infra red radiation emitted by objects due to their
thermal conditions
3. Thermography
Objectives of Test
• To detect hot or cold area’s
• To determine absolute temperature
• To view Thermal profiles
• To detect temperature loss
4. Thermography
Infra Red is part of the
Electromagnetic
Spectrum
• It travels in straight lines at
the speed of light
• The useful part is divided
between Short and Long
wavelengths
• Use of the correct
wavelength is essential
5. Test Equipment
• Hand held portable camera
• Battery Powered
• Operating at correct
wavelength
• Range…..-20°c to +1500°c
• Sensitivity…..0.1°c at 30°c
• Real time display
• Image Recording capability
6. Why Thermography?
• Non Contact
• Rapid Scanning
• Data can be recorded in differing formats
• Images produced are comprehensive &
reliable
• Is there a viable alternative?
7. Principles of Operation
• Object radiates infra red radiation
• Temperature difference
• Differences are detected and displayed visually
• Emissivity values must be observed
8. Advantages
• Non Contact
• Non Intrusive
• Can work at a distance
• Fast and Reliable
• Portable
• Convincing Results
9. Limitations
• Non Intrinsically safe
• There must be a temperature difference for
certain surveys
• Operator experience is essential
• Filters may be needed for certain
applications
• Sensitivity and Resolution reduce with
distance and angle of view
14. Electrical Connections
Used for the detection of;
• Corroded connections
• Slack / loose connectors
• Connectors at too high an
operating temperature
• Hot spots
21. Building Surveys
Used to detect,
• Lack of insulation
• Cold air infiltration
Draughts
• Moisture traps
• Hot / warm air escaping
• Structural Integrity
• Heating / Cooling
27. Process Plant
The above Thermograms show how
Thermography can be used as a very fast and
effective maintenance tool.
– The image on the right has a defective cylinder