Abstract
Photoacoustic spectroscopy (PAS) is a useful monitoring technique that is well suited for ranged detection of condensed materials. Ranged PAS has been demonstrated using an interferometer as the sensor. Interferometric measurement of photoacoustic phenomena focuses on the measurement of changes in path length of a probe laser beam. That probe beam measures, without discrimination, the acoustic, thermal, and physical changes to the excited sample and the layer of gas adjacent to the surface of the solid sample. For layered samples, the photoacoustic response of the system is influenced by the physical properties of the substrate as well as the sample under investigation. We will discuss the affect that substrate absorption of the excitation source has on the spectra collected in PAS. We also discuss the role that the vibrational modes of the substrate have in photoacoustic signal generation.
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