Phase Correction In Fourier Transform Infrared (FTIR)

D. B. Chase

doi:10.1117/12.932184

29 October 1981 Phase Correction In Fourier Transform Infrared (FTIR)

D. B. Chase

Proceedings Volume 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy; (1981) https://doi.org/10.1117/12.932184
Event: 1981 International Conference on Fourier Transform Infrared Spectroscopy, 1981, Columbia, United States

Abstract

In rapid scanning FT-IR, several sources of errors can lead to reduced photometric accuracy and faulty results, especially in the area of spectral subtraction. Poor phase correction is one and can lead to misleading features such as false residuals in the subtraction spectra. The most common algorithm employed for phase correction is the Mertz method where a phase error array is calculated from a short double sided interferogram and the correction applied to the results of a complex Fourier transform. An alternative method discussed by Forman, Steel and Vanasse2 used the phase error array to generate a convolution function which "symmetrizes" the interferogram. The spectrum is then calculated with a real Fourier transform. This method has several advantages; i.e., less sensitivity to the location of the center burst and the ability to easily iterate on the phase error. The results with both methods will be discussed for ideal asymmetric interferograms and actual instrumental data.

Citation Download Citation

D. B. Chase "Phase Correction In Fourier Transform Infrared (FTIR)", Proc. SPIE 0289, 1981 Intl Conf on Fourier Transform Infrared Spectroscopy, (29 October 1981); https://doi.org/10.1117/12.932184

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