Computer Science
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..513s&link_type=abstract
The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 513-515 (1
Computer Science
Energy-Conversion Spectro-Analytical Methods, Organic Compounds, Polymers
Scientific paper
Photoacoustic spectroscopy (PAS) depth profiling results are consistent with the known layer structure of a Paramount laminate film and an adhesive label. There is a clear relationship between the measured phase angle differences and individual layer thicknesses. At low modulation frequencies, deeper sample depths are probed and the phase-angle differences are smaller than at higher frequencies. Digital signal processing enables multiple depth ranges to be probed in a single experiment. Comparing different modulation-frequency results helps to verify the layer thickness estimates. PAS depth profiling is a viable approach when the top layer is either: 1) thin; or 2) not strongly absorbing in key regions of the IR spectrum where deeper layers absorb.
Marcott C.
Story G. M.
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