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Proceedings Paper

Photoacoustic fourier transform infrared spectroscopy with a step-scan interferometer
Author(s): Phillip J. Stout; Richard A. Crocombe
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Paper Abstract

Limitations of rapid scan PAS measurements can be overcome with a step-scanning interferometer operated in a phase modulation mode. Phase modulation has the desirable effect of modulating all the wavelengths at the same Fourier frequency. This results in an even depth of penetration into a sample across the spectral range observed. Use of a phase demodulator allows for the detection of phase information from the photoacoustic signal rising from the sample. Collection of the in-phase (0 degree phase angle) and in-quadrature (90 degree phase angle) signals allows for the calculation of phase angle information at any chosen angle. This information can be used to produce spectra of a surface and a bulk component in a sample in a single experiment.

Paper Details

Date Published: 31 January 1994
PDF: 2 pages
Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); doi: 10.1117/12.166578
Show Author Affiliations
Phillip J. Stout, Bio-Rad Labs. (United States)
Richard A. Crocombe, Bio-Rad Labs. (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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