Water content evolution in leaves based on active THz imaging system

Quality control systems in industry can benefit from the new possibilities offered by THz frequency range. THz imaging systems can complement actual quality control systems and at the same time offer new information about products, improving quality and reducing costs. In this case we have implemented and imaging system to control the evolution of water content in leaves. THz frequencies are sensitive to water content in leaves. Therefore, THz leaves images vary depending on the water content in leaves. Wine industry could benefit directly of this new technology. Irrigation cost can be reduced by accurately measuring the water content of the plant. In this paper THz images of a leaf in a 48 hour time period are presented. The evolution of the water content in the leaf can be clearly seen in THz while in the visible region the leaf has no change. Furthermore, the imaging system and techniques based on time and frequency domains for transmission and reflection will be discussed.