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Evolution of spectrometric performance of FTIR in relation to quantitative chemical composition and physical parameter determination

Near the start of activity in FT-IR, the most important feature was sensitivity as derived from the multiplex and throughput advantages. It permitted weak emission, very high resolution spectroscopy and later the exploitation of such techniques as diffuse reflectance and photoacoustic spectroscopy in the mid IR region. Carefully configured FT-IR systems in well controlled laboratory environments provide excellent reproducibility. This permitted extension to IR spectroscopy where small changes in large signals could be measured. Even today reproducibility is frequently demonstrated as a measure of FT-IR performance via the well known 100% line. Of course in the use of quantitative analysis methods sensitivity and reproducibility are of importance, but they are by no means a complete specification of the performance of an FT-IR based analyzer using a chemometric method.