OBJECTIVE
Interferometric microscopy, also known as Peak Fringe Scanning Microscopy (PFSM), has only recently been applied to the characterization of hair surfaces. This study aims to evaluate its relevance in assessing the impact of thermal stress on hair fiber surfaces.
METHODS
MiniSURF, a full-field optical interferometer utilizing PFSM technology, was employed to analyze Caucasian hair samples. Initial measurements were taken to establish baseline surface conditions. The samples were then subjected to various thermal stress protocols simulating real-life scenarios, including exposure to a hair dryer and a straightening iron. Multiple cycles of heat application were performed, and surface measurements were taken after each treatment. Using appropriate analytical parameters, surface roughness values were extracted for each hair fiber.
RESULTS
The findings demonstrate a measurable alteration in hair surface morphology following thermal stress, confirming the sensitivity of interferometric microscopy to changes induced by heat exposure.
CONCLUSION
These results support the potential of interferometric microscopy as a valuable tool for quantifying the effects of aggressive treatments on hair. Future studies involving other types of stressors as well as cosmetic treatments should further validate its applicability in cosmetic and dermatological research.