Figure 5
From: Non-invasive measurement of leaf water content and pressure–volume curves using terahertz radiation
Plots of water layer thickness as determined using the THz approach (in red), and gravimetric measurements (in black), as a function of drying time in a sample of Sloanea australis. Note that measurements were taken up to 250 min, when drying under ambient laboratory conditions (typically 23° C, 40% relative humidity). All measurements taken after 500 min were done so with the leaf undergoing accelerated drying in an oven (70° C). The THz measurement and weight measurements were taken within 2 min of one another, ensuring minimal change in water content between the two measurement methods. Plot (a) shows results for 1 pair of frequencies; (b) 3 pairs of frequencies; (c) 36 pairs of frequencies; and (d) 465 pairs of frequencies.
