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Infrared Thermography

Infrared and Thermal Testing | Thermal Imaging Technique

Infrared thermography is a non-destructive, nonintrusive, noncontact mapping of thermal patterns or “thermograms”, on the surface of objects through the use of some kind of infrared detector.

There are two approaches in thermographic inspection:

  • passive, in which the features of interest are naturally at a higher or lower temperature than the background.
  • active, in which an energy source is required to produce a thermal contrast between the feature of interest and the background.

When compared with other classical non-destructive testing techniques such as ultrasonic testing or radiographic testing, thermographic inspection is safe, nonintrusive and noncontact, allowing the detection of relatively shallow subsurface defects (a few millimetres in depth) under large surfaces and in a fast manner (from a fraction of a second to a few minutes) depending in the configuration. Instead of detecting the temperature point by point, our camera is able to detect the temperature across a complete surface. This gives an excellent image of local temperature differences.

Infrared Thermography is an excellent help in monitoring or optimizing processes. VNS brings the equipment needed during the inspection. All images will be saved digitally and after the analysis you will receive a comprehensive full colour report.

Infra Red Thermography testing can be done on

  • Detecting loose or corroded electrical connections
  • Detecting electrical unbalance and overloads
  • Inspecting bearings and Electrical motors
  • Inspecting steam systems IR Imaging helps to better identify and report suspect components
  • Enable the repair to be done right the first time.

Three Common Uses

This article will touch upon three of the most common applications of infrared thermography:

  • Electrical — using infrared thermography a technician can help detect faulty connections in early stages, so possible breakdowns can be avoided.
  • Mechanical — excessive friction can cause breakdowns if equipment is not lubricated properly. Infrared thermography can help detect problem areas in motor bearings, gears, couplings, pulleys, conveyors and chain drive systems.
  • Refractory/Insulation — this application addresses hidden losses of heat that can drain performance and increases costs. Experienced thermographers can evaluate thermal images of walls, ceilings and roofs for signs of heat either escaping from those areas or entering the insulated space.

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