Monitoring leaf water content with THz and sub-THz waves

Plant Methods

Martin Koch¹  Ralf Gente¹ 

[1] Faculty of Physics and Material Sciences Center, Philipps-Universität Marburg, Renthof 5 35032, Marburg, Germany

关键词: Drought-stress;    Water-content;    Water-status;    Sub-THz;    THz;   

Others  :  1174980
DOI  :  10.1186/s13007-015-0057-7

 received in 2014-12-03, accepted in 2015-02-12,  发布年份 2015

【 摘 要 】

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 future technological developments towards more compact and budget-priced measurement systems for use in the field.

【 授权许可】

   
2015 Gente and Koch; licensee BioMed Central.

【 图 表 】

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