Identification of Chinese Herbal Medicines from Zingiberaceae Family Using Feature Extraction and Cascade Classifier Based on Response Signals from E-Nose

Table 3

Orthogonal design factors and levels.

Factors	Level
	1	2	3
A: particle size	850 ± 29 𝜇m	355 ± 13 𝜇m	250 ± 9.9 𝜇m
B: incubation temperature	35°C	40°C	45°C
C: incubation time	360 s	480 s	600 s