Monitoring leaf water content with THz and sub-THz waves

Plant Methods
Ralf Gente, Martin Koch

Abstract

Terahertz technology is still an evolving research field that attracts scientists with very different backgrounds working on a wide range of subjects. In the past two decades, it has been demonstrated that terahertz technology can provide a non-invasive tool for measuring and monitoring the water content of leaves and plants. In this paper we intend to review the different possibilities to perform in-vivo water status measurements on plants with the help of THz and sub-THz waves. The common basis of the different methods is the strong absorption of THz and sub-THz waves by liquid water. In contrast to simpler, yet destructive, methods THz and sub-THz waves allow for the continuous monitoring of plant water status over several days on the same sample. The technologies, which we take into focus, are THz time domain spectroscopy, THz continuous wave setups, THz quasi time domain spectroscopy and sub-THz continuous wave setups. These methods differ with respect to the generation and detection schemes, the covered frequency range, the processing and evaluation of the experimental data, and the mechanical handling of the measurements. Consequently, we explain which method fits best in which situation. Finally, we discuss recent and f...Continue Reading

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Citations

Feb 26, 2020·Annual Review of Plant Biology·Michelle WattUlrich Schurr
May 16, 2018·Biomedical Optics Express·Mariia BorovkovaIgor Meglinski
Jun 24, 2017·Plant Methods·Lorenzo BaldacciAlessandro Tredicucci
Sep 15, 2015·Optics Express·Thorsten ProbstMartin Koch
Apr 21, 2019·Plant Science : an International Journal of Experimental Plant Biology·Thomas RoitschEric S Ober

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