An Approach of Spectra Standardization and Qualitative Identification for Biomedical Materials Based on Terahertz Spectroscopy

Figure 2

THz spectra of 12 compounds measured by two THz-TDS systems. Black solid lines show spectra obtained from the USST system (left y-axis)—original time-domain spectral data without any data processing; red dotted lines show spectra obtained from the Gaojing system (right y-axis)—smoothed data after information privacy processing. (a) 4-Aminobenzoic acid. (b) A2. (c) A3. (d) Amoxicillin. (e) Phenylalanine. (f) Benzoic acid. (g) C5. (h) d-Lactose monohydrate. (i) p-Toluylic acid. (j) Glutamic acid. (k) Trinitrotoluene. (l) Riboflavin.

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