The experimental research of leaf water content using terahertz time-domain spectroscopy

Jian Zuo; Zhen-wei Zhang; Jun He; Liang-liang Zhang; Kai-jun Mu; Cun-lin Zhang

doi:10.1117/12.900838

11 August 2011 The experimental research of leaf water content using terahertz time-domain spectroscopy

Jian Zuo, Zhen-wei Zhang, Jun He, Liang-liang Zhang, Kai-jun Mu, Cun-lin Zhang

Proceedings Volume 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications; 81951F (2011) https://doi.org/10.1117/12.900838
Event: International Symposium on Photoelectronic Detection and Imaging 2011, 2011, Beijing, China

Abstract

Leaf water content is one of the most important indicators of the plant growth status. Thus, for a long-term research of the plants, the nondestructive and contactless measurement methods are preferable. Recently, the terahertz (THz) frequency region from 0.1THz to 10THz (or 3-333cm^-1) has seen a flurry of research activity in the fields of physics, chemistry and biology. Terahertz wave is very sensitive to water. This characteristic suggests the capability of THz spectroscopy for monitoring the water content of the plants. In this paper, the influence of varying water content in different zones of the same plant on the absorption and refraction coefficients was given. The influence of varying water content in the different locations of the mesophyll and mid-vein on the absorption and refraction coefficient was described. And the variations mainly result from the different thicknesses of leaf. The absorption and refraction coefficients with different relative water content in the green and yellow leaves were given. These comparisons between green leaf and yellow leaf reveal that the complex permittivity of leaf is as a complex function of the water content of the leaf. So our measurements tend to demonstrate that the dielectric material parameters will be employed to determine the leaf water status in plant leaves. All measurements are in the range of 0.2 to 2.6 THz. These researches will contribute to the future work of a compact and contact-free THz spectrometer to avoid any damage of the leaf surface.

Citation Download Citation

Jian Zuo, Zhen-wei Zhang, Jun He, Liang-liang Zhang, Kai-jun Mu, and Cun-lin Zhang "The experimental research of leaf water content using terahertz time-domain spectroscopy", Proc. SPIE 8195, International Symposium on Photoelectronic Detection and Imaging 2011: Terahertz Wave Technologies and Applications, 81951F (11 August 2011); https://doi.org/10.1117/12.900838

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