Detection of Adulteration of Panax Notoginseng Powder by Terahertz Technology

Figure 7

Spectral analysis of absorption coefficient of Panax notoginseng powder with different adulterated concentrations; (a) is adulterating with zedoary turmeric powder; (b) is adulterating with rice flour; (c) is adulterating with wheat flour.

(a)

(b)

(c)