Usually sample surface structures generate large flunctuations of the photothermal response due to local variations of optical, thermal and geometrical properties which mask the crack signal when using single detection ir radiometry. Demonstrated experimentally and theoretically is the ability of a differential stimulated ir detection scheme to obtain a better contrast in crack detection on real samples. A finite element simulation confirms the magnitude and shape of the signals for vertical and slanted cracks.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering