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Proceedings Paper

Phase correction and two-dimensional correlation analysis for depth-profiling photoacoustic step-scan FTIR spectroscopy
Author(s): Gloria M. Story; Curtis A. Marcott; Isao Noda
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Paper Abstract

A method is described which corrects for the instrument response function in step-scan FT-IR photoacoustic spectroscopy (PAS) without distorting the thermal response information necessary for depth profiling layered samples. The instrumental phase correction functions are determined from the phase-sensitive photoacoustic signals of a strong surface absorber, such as carbon black. Phase correction functions generated from the monosignate spectrum of carbon black are used to compute the in-phase and quadrature interferograms of the sample. This treatment allows unratioed PAS spectra to properly change sign as a function of lock-in amplifier phase angle, thereby making a 2D correlation analysis of the results meaningful. This approach is used to clearly separate individual signals originating from a three-layer sample film of polydimethylsiloxane (PDMS), polyethylene (PE), and polystyrene (PS).

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166793
Show Author Affiliations
Gloria M. Story, Procter & Gamble Co. (United States)
Curtis A. Marcott, Procter & Gamble Co. (United States)
Isao Noda, Procter & Gamble Co. (United States)

Published in SPIE Proceedings Vol. 2089:
9th International Conference on Fourier Transform Spectroscopy
John E. Bertie; Hal Wieser, Editor(s)

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