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. 2023 Dec 14;13:22261. doi: 10.1038/s41598-023-48426-5

Figure 2.

Figure 2

(a) Stress marks on a green spinach leaf after the measurements using the different probes. (b) Infrared absorption spectra in the range of 4000–900 cm−1 using a CIR single loop (green curve), a CIR triple loop (blue curve), a PIR single loop (red curve), a PIR triple loop (orange curve), a ZnSe tip (cyan curve), and a non-fiber diamond ATR (black curve). (c) Stress marks on a green lettuce leaf after measurements using 1 N, 3 N and 5 N force respectively. (d) Combined infrared spectra of CIR and PIR triple loop measurements of the leaf with a contact force of 1 N (green curve), 3 N (blue curve) and 5 N (orange curve). The CIR region is marked with blue background and the PIR region is marked with light yellow background.