Comparison of Methods for Transfer of Calibration Models in Near-Infared Spectroscopy: A Case Study Based on Correcting Path Length Differences Using Fiber-Optic Transmittance Probes in In-Line Near-Infrared Spectroscopy

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Abstract:

This article addresses problems related to transfer of calibration models due to variations in distance between the transmittance fiber-optic probes. The data have been generated using a mixture design and measured at five different probe distances. A number of techniques reported in the literature have been compared. These include multiplicative scatter correction (MSC), path length correction (PLC), finite impulse response (FIR), orthogonal signal correction (OSC), piecewise direct standardization (PDS), and robust calibration. The quality of the predictions was expressed in terms of root mean square error of prediction (RMSEP). Robust calibration gave good calibration transfer results, while the other methods did not give acceptable results.

Keywords: CALIBRATION TRANSFER; FIBER-OPTIC PROBES; FINITE IMPULSE RESPONSE; IN-LINE NIR SPECTROSCOPY; MSC; MULTIPLICATIVE SCATTER CORRECTION; NEAR-INFRARED SPECTROSCOPY; ORTHOGONAL SIGNAL CORRECTION; PATH LENGTH CORRECTION; ROBUST CALIBRATION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702053641522

Affiliations: Mills DA, Research and Development, Sofienberggt. 19, P.O. Box 4644 Sof., N-0506 Oslo, Norway

Publication date: April 1, 2005

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