Abstract
Depth profiling measurements are carried out on aluminum-foil coated with a tie-resin and a polyethylene (P.E.) film. Since the total thickness is constant, an increase of the thickness of the tie-resin brings about a thinner P.E.-film. For a series of different combinations, the photoacoustic signal is investigated for different modulation frequencies. Gradual changes in the intensity of the tie-resin vibrations are observed. Mostly, these peaks are inverted but, in some cases, they can be turned into normal vibration bands. This is caused by phase errors due to a time delay of heat detected at different depths in the sample. The purpose of this study is to determine the thickness of polymer layers on aluminum-foil using photoacoustic measurements at different modulation frequencies.
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Philippaerts, J., Vanderheyden, E. & Vansant, E.F. FTIR-PAS-spectroscopic study of transparent double-layer polymer films. Mikrochim Acta 95, 145–148 (1988). https://doi.org/10.1007/BF01349740
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DOI: https://doi.org/10.1007/BF01349740