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Applied Spectroscopy

Applied Spectroscopy


  • Vol. 52, Iss. 4 — Apr. 1, 1998
  • pp: 604–612

Assessing the Validity of Near-Infrared Monochromator Calibrations Over Time

Eric Bouveresse, Chiara Casolino, and Desire-Luc Massart

Applied Spectroscopy, Vol. 52, Issue 4, pp. 604-612 (1998)

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A procedure to check the validity of near-infrared calibration models over time is proposed. Validation samples are analyzed at regular time intervals by both near-infrared and reference methods in order to check the validity of the near-infrared calibration model. When an invalid situation is detected, a stable polystyrene standard is measured, to determine whether this invalid situation is due to fluctuations of the instrumental response of the near-infrared spectrometer or not. A first method based on simulating simple instrumental differences enables one to correct those simple differences with only the polystyrene standard. It is shown that such an approach can correct most of the simple instrumental differences without the use of standardization procedures. However, when the invalid situation is due to more complex instrumental differences, standardization must be applied. This procedure is applied to simulated and real near-infrared data sets.

Eric Bouveresse, Chiara Casolino, and Desire-Luc Massart, "Assessing the Validity of Near-Infrared Monochromator Calibrations Over Time," Appl. Spectrosc. 52, 604-612 (1998)

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