Near-IR quantitative analysis is now well-established using multivariate statistical expressions. This has been particularly useful for routine industrial applications. Mainly filter instruments have been used industrially. However grating monochromators, and more recently acousto- optic tunable filter and FT-NIR instruments are available for use. The practicality of FT-NIR for industrial quantitative monitoring has been subject to question. In this work, quantitation was performed on all three types of scanning instruments. Unlike mid-IR, in near-IR it is necessary to quantitate relatively weak absorption differences measured in a few milliabsorbance units. In the past, most FT-NIR was done with modified FT-IR instruments. Dedicated FT-NIR instruments are now commercially available. Quantitative performance of such an instrument for routine use on industrial samples has been demonstrated. Results presented show success for the chemical mixtures used. Ruggedness, wavelength reproducibility, and cost make such equipment appropriate for near-IR quantitative analysis.

Date Published: 1 March 1992
PDF: 2 pages
Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); doi: 10.1117/12.56463

Published in SPIE Proceedings Vol. 1575:
8th Intl Conf on Fourier Transform Spectroscopy
Herbert Michael Heise; Ernst Heiner Korte; Heinz W. Siesler, Editor(s)