Step-Scan FT-IR Photoacoustic Spectroscopy: The Signal Phase
1997; SAGE Publishing; Volume: 51; Issue: 4 Linguagem: Inglês
10.1366/0003702971940576
ISSN1943-3530
AutoresM. W. C. Wahls, J. P. Toutenhoofd, L. H. Leyte-Zuiderweg, J. De Bleijser, J. C. Leyte,
Tópico(s)Advanced Chemical Sensor Technologies
ResumoThe model of Rosencwaig and Gersho for the photoacoustic effect is tested. The use of carbon black samples as a phase reference to estimate the apparatus phase φ app from the experimental signal phase φ exp turned out to be ambiguous. A new method is presented to correct the experimental signal phases φ exp of polymer films for the apparatus phase φ app . The photoacoustic signal phase of some well-defined poly(ethyleneterephthalate) (PET) films is obtained. As a phase reference, transparent thermally thick polymer films were found to be more convenient and dependable than carbon black samples. The resulting phase spectra of thermally thick and thermally thin PET films confirm the Rosencwaig–Gersho theory.
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