Quantitative Detection of Quartz Sandstone SiO₂ Grade Using Polarized Infrared Absorption Spectroscopy with Convolutional Neural Network Model

Table 2

Contributions of the top 5 principal components.

Number of principal components	Cumulative contribution rate (%)
	Original data	First-order derivative	Reciprocal logarithm	MSC
PC01	0.957	0.797	0.946	0.727
PC02	0.990	0.901	0.991	0.900
PC03	0.995	0.939	0.996	0.961
PC04	0.998	0.955	0.998	0.980
PC05	0.999	0.969	0.999	0.989