Photometric Precision in Infrared Spectra Measured by Fourier Transform Spectroscopy

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Abstract
Digitally recorded spectra containing lines of width less than or equal to the resolution at which the measurement has been made are observed to show some photometric In spectra measured by Fourier transform spectroscopy, this error may be substantially reduced if the interferogram is zero-filled. To prevent the generation of artifacts in the spectrum (of a similar origin to the sine x side-lobes formed when a non-zero-filled spectrum is computed with a box-car truncation function), the zero-filled interferogram must be suitably apodized.

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