Pulse phase thermography
Pulse-phase thermography is a thermographic testing method that analyzes the thermal response of a component after a heat input. It provides depth-resolved information about hidden delaminations.
Physical-Chemical Mechanism of Action
The method uses a short, strong heat input (pulse) to study the thermal behavior of the material. The resulting temperature change is analyzed via Fourier transform, producing phase images.
Metallurgical Relevance & Risks in Welding
This technique is particularly useful for testing delaminations and other internal flaws in complex components. Incorrect interpretation or insufficient resolution can lead to errors, as it relies on accurate temperature and time measurements.
Workshop Practice & Action Instructions
To successfully use pulse-phase thermography, the heat inputs must be precisely controlled. The Fourier transform should be performed with specialized software. The resolution of phase images depends on the quality of the measuring device and the parameters used.