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Lookup NU author(s): Dr Mengbao Fan,
Dr Binghua Cao,
Professor Gui Yun TianORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2017 Mengbao Fan et al. THz time-domain spectroscopy has evolved as a noncontact, safe, and efficient technique for paper characterization. Our previous work adopted peak amplitude and delay time as features to determine paper basis weight using terahertz time-domain spectroscopy. However, peak amplitude and delay time tend to suffer from noises, resulting in degradation of accuracy and robustness. This paper proposes a noise-robust phase-shift based method to enhance measurements of paper basis weight. Based on Fresnel Formulae, the physical relationship between phase shift and paper basis weight is formulated theoretically neglecting multiple reflections in the case of normal incidence. The established formulation indicates that phase shift correlates linearly with paper basis weight intrinsically. Subsequently, paper sheets were stacked to fabricate the samples with different basis weights, and experimental results verified the developed mathematical formulation. Moreover, a comparison was made between phase shift, peak amplitude, and delay time with respect to linearity, accuracy, and noise robustness. The results show that phase shift is superior to the others.
Author(s): Fan M, Cao B, Tian G
Publication type: Article
Publication status: Published
Journal: Journal of Sensors
Online publication date: 16/04/2017
Acceptance date: 13/04/2017
Date deposited: 20/06/2017
ISSN (print): 1687-725X
ISSN (electronic): 1687-7268
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