Abstract
This chapter presents the technique of infrared thermography (IRT) in the inspection and assessment of glass-reinforced polymer (GRP) wind turbine blades. It presents and explains both the passive and active thermography approaches (pulsed, step heating, lock-in, etc.) when inspecting composite–GRP wind turbine blades, outlining the advantages and limitations of the technique(s). Furthermore, it reviews some of the most interesting signal processing techniques that can be used for the active thermography inspection and analysis of composite materials (differential absolute contrast – DAC, thermographic signal reconstruction – TSR, principal component thermography – PCT, pulsed phase thermography – PPT). Finally, it concludes the use of IRT in inspecting and evaluating wind turbine blades.
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