Step-Scan FT-IR Photoacoustic Spectroscopy: The Signal Phase

Authors: Wahls, M.W.C.; Toutenhoofd, J.P.; Leyte-Zuiderweg, L.H.; Bleijser, J. De; Leyte, J.C.

Source: Applied Spectroscopy, Volume 51, Issue 4, Pages 134A-137A and 453-603 (April 1997) , pp. 552-557(6)

Publisher: Society for Applied Spectroscopy

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Abstract:

The 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 phi from the experimental signal app phase phi turned out to be ambiguous. A new method is presented exp to correct the experimental signal phases phi of polymer films for exp the apparatus phase phi . The photoacoustic signal phase of some app 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.

Keywords: STEP-SCAN FT-IR PHOTOACOUSTICS PAS-PHASE PHASE-RES

Document Type: Research article

DOI: http://dx.doi.org/10.1366/0003702971940576

Publication date: 1997-04-01

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