Zerstörungsfreie Prüfung von Polymeren mittels photothermischer Meßmethoden. 2. Photoakustische untersuchungen von Polyesterfärbungen in Abhängigkeit von der Farbstoffkonzentration und der Oberflächenrauheit

The determination of dyestuff concentration in dark and saturated dyed textiles poses great problems to conventional analytical methods. In this work the use of photoacoustic spectroscopy as analytical tool is systematically investigated by comparing measurements of samples with different dyestuff concentrations. The experimental data can be fitted to a modified Kubelka-Munk function which shows a linear relationship to the dyestuff concentration in a wider range than the reflection spectroscopy. The influence of the surface structure to the photoacoustic signal is investigated.