The components in
polymer-bonded explosive X, including cyclotetramethylene-tetranitramine,
paraffin, and polytetrafluoroethylene, were determined using near-infrared
(NIR) spectroscopy. Using partial least squares as the multivariate
calibration method, quantitative calibration models for components
in X were verified internally and externally. The possible combinations
of eight general spectral pretreatment methods and different bands
of the scanning spectral region (12,500–4000 cm
–1
) were established. The models were analyzed, evaluated, and optimized
via the fitting effect. The data were combined with the mathematical
meaning of the model spectral pretreatment methods and the chemical
significance of the modeling spectral bands. Prediction performance
offered optimal quantitative calibration models. Paired bilateral
Student’s t tests show that there is no significant difference
between the values obtained by NIR and chemical analysis methods,
and the NIR method has good accuracy. Moreover, the precision of the
NIR method is better than that of the chemical method, and the analysis
time is reduced from 2 days to a few minutes.
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