Overall uncertainty assessment of near infrared spectrum analysis of jet fuel

DOI:	10.11809/bqzbgcxb2023.06.042
Keywords:	overall uncertainty; jet fuel; near infrared spectrum analysis; β content tolerance interval (β CTI)
Abstract:	NIR analysis of jet fuel is an indirect correction analysis based on the interaction of the instrument itself and the analysis model. This paper adopts measurement uncertainty to assess the error of the near infrared spectrum analysis of the jet fuel. Taking the NIR analysis of kinetic viscosity of jet fuel at 20 ℃ as an example, this paper fully considers various uncertainty factors of the NIR analysis from the perspective of the overall measurement uncertainty. The uncertainty of the near infrared spectrograph, the standard data measurement and the NIR quantitative analysis model is determined as three components of the overall uncertainty of the NIR measurement results, and the relative uncertainty of each component is calculated. The uncertainty component introduced by the NIR quantitative analysis model is evaluated by β content tolerance interval (β CTI) uncertainty evaluation method based on the verification data. The uncertainty components introduced by the obtained near infrared spectrograph, the standard data measurement and the NIR quantitative analysis model are 0.11%, 0.36% and 0.683% respectively, accounting for 10%, 31% and 59% of the overall uncertainty respectively. Finally, the overall relative synthetic uncertainty of the near infrared spectrum analysis of the jet fuel is 1.56%. It can be seen from the size of the uncertainty components that the accuracy of the NIR quantitative analysis method depends heavily on the established analysis model. The assessment of the overall uncertainty of the near infrared spectrum analysis of the jet fuel can effectively evaluate the accuracy and reliability of this kind of analysis methods, and can provide reference for the uncertainty assessment of other substances.
Published:	2023-06-28
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