Enhanced Measurement of Paper Basis Weight Using Phase Shift in Terahertz Time-Domain Spectroscopy

Table 2

Maximum, average, and variance of the relative errors for samples.

	80 g/m^2			160 g/m^2
	Peak amplitude	Delay time	Phase shift (1.011 THz)/rad	Peak amplitude	Delay time	Phase shift (1.392 THz)/rad
Maximum (%)	35.12	13.0	3.61	30.22	6.27	1.74
Average (%)	12.19	3.59	1.39	6.30	3.05	0.58
Variance (%)	10.20	4.26	1.15	9.84	2.51	0.62