PHOTOMETRIC ACCURACY IN FT-IR SPECTROMETRY

Many factors affect the photometric accuracy of Fourier transform spectrometers. They include the effect of resolution and apodization on the spectrum, the reproducibility of the single-beam spectra, the accuracy of the zero level, and the linearity of the transmittance (T) scale. Several spectrometer manufacturers have observed that the 100% line on their instmments may be reproduced to better than 0.1% and, as a result, have claimed that their instruments are accurate to 0.1 %T. This is not necessarily the case, however, as we show below. 

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