All objects emit thermal energy in the form of infrared radiation.

The higher the temperature of an object, the higher the level of energy radiated. A thermal image camera detects the energy on the surface of an object, and creates a coloured picture distinguishing 'hot' from 'cold.' It is a popular method of inspection, as it is non-contact and non-destructive.

Correct analysis of an image is key, as what appears hot or cold may actually be the result of a combination of factors, such as air flow over or behind the surface, missing or defective insulation, thermal bridging, moisture etc.

A correctly recorded and analysed image can readily identify anomalies that would otherwise go undetected. Thermal imaging can be used as an early investigative tool, to allow targeted follow up of anomalies using conventional inspection techniques. In electrical applications, it can be used as a predictive maintenance tool, identifying overheating connections and components caused for example, by over or unbalanced loading, and loose connections.

Independent information on the usefulness of thermal imaging as a tool to identify energy loss in Scotland and across the UK is available from the Carbon Trust website here.