Thermal methods have been recognized above other NDI methods for rapid inspection of large structures. Thermal methods are safe, convenient and relatively inexpensive tools; however, the techniques' dependence on emissivity makes them sensitive to field conditions such as chipped paint. The following describes an exciting new crack detection technology: Coating Tolerant Thermography (CTT), which is specifically designed to meet the demands of more challenging field conditions. CTT exhibits high probability of detection, low false signals, easy interpretation, high speed and convenient portability.
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