Active THz imaging system to measure water content evolution in leaves

David Etayo; Juan Carlos Iriarte; Inés Palacios; Inigo Ederra; Ramón Gonzalo

doi:10.1117/12.897978

13 October 2011 Active THz imaging system to measure water content evolution in leaves

David Etayo, Juan Carlos Iriarte, Inés Palacios, Inigo Ederra, Ramón Gonzalo

Author Affiliations +

Proceedings Volume 8188, Millimetre Wave and Terahertz Sensors and Technology IV; 81880C (2011) https://doi.org/10.1117/12.897978
Event: SPIE Security + Defence, 2011, Prague, Czech Republic

Abstract

Quality control systems in industry can benefit from the new possibilities offered by the 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 an imaging system to control the evolution of water content in leaves. The work presented in this paper shows the water content evolution of leaves in the range from 0.14 THz to 0.22 THz. Transmission and reflection parameters have been measured obtaining frequency and time domain information. While in the visible region the leaf is still green after 48 hours of cutting, and no appreciable change can be seen, in the THz image more than 5dB variation can be obtained due to the loss of water in the leaf. As a conclusion, it can be said that imaging in active THz technology can be used to measure the evolution of water content in leafs at the early stage of drying, where no changes are noticeable in the visible region. Agriculture quality control systems could benefit from this technology.

Citation Download Citation

David Etayo, Juan Carlos Iriarte, Inés Palacios, Inigo Ederra, and Ramón Gonzalo "Active THz imaging system to measure water content evolution in leaves", Proc. SPIE 8188, Millimetre Wave and Terahertz Sensors and Technology IV, 81880C (13 October 2011); https://doi.org/10.1117/12.897978

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