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Related Experiment Videos

Phase correction of interferograms using digital all-pass filters.

Robert Furstenberg1, Jeffrey O White

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. furstenb@uiuc.edu

Applied Spectroscopy
|May 20, 2005
PubMed
Summary

A novel digital all-pass filter effectively corrects phase errors in Fourier transform infrared spectroscopy (FTIR) interferograms. This method minimizes photometric errors, outperforming traditional techniques like the Mertz method for improved spectral accuracy.

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Area of Science:

  • Spectroscopy
  • Analytical Chemistry
  • Optical Physics

Background:

  • Phase errors in interferograms limit the accuracy of Fourier transform infrared spectroscopy (FTIR).
  • Existing methods like the Mertz method can introduce photometric errors due to asymmetric apodization.
  • Accurate phase correction is crucial for reliable spectral data acquisition.

Purpose of the Study:

  • To present a new digital all-pass filter method for phase correction in FTIR.
  • To demonstrate the superiority of this method over the Mertz method in minimizing photometric errors.
  • To offer a faster alternative approach combining all-pass filtering with the Mertz method.

Main Methods:

  • Implementation of a low-order digital all-pass filter to modify interferogram phase while preserving magnitude.

Related Experiment Videos

  • Minimization of asymmetric apodization, a key source of photometric error.
  • Application of a 9-pole all-pass filter for broad frequency range correction (800-4000 cm⁻¹).
  • Development of an alternative rapid approach using a less precise filter followed by the Mertz method.

    • Main Results:

    • The all-pass filter method achieved phase correction with arbitrary angular precision.
    • Photometric errors were reduced to <0.01%, significantly lower than the Mertz method's 0.3%.
    • The combined filter-Mertz method provided a fast (approx. 100 ms) and accurate phase correction solution.

    Conclusions:

    • The digital all-pass filter offers a superior method for phase correction in FTIR spectroscopy.
    • This technique effectively minimizes photometric errors, enhancing spectral data quality.
    • The method is versatile and applicable to various spectroscopic experiments, including emission spectroscopy.