Method for detecting water content of plant leaf based on terahertz back scattering signal

Abstract

The invention provides a method for detecting the water content of a plant leaf based on a terahertz back scattering signal. The method comprises steps that terahertz signals are transmitted by a radar, and the signals are scattered to all directions in a space by the leaf when the signal radiated by the terahertz radar is incident to the leaf at an angle theta 1, the part with the transmission direction angle of theta 1 can be received by the terahertz radar, and the part of signals are called back scattering signals; the backscattering signal and the transmitting signal link are parallel and are opposite in transmission direction; the radar receives the backscattered signal, and the power change of the signal is measured through a power meter to obtain the information of the interaction between the signal and the leaf so as to obtain the water content information of the leaf; and the water content information of the leaf is determined according to the function relationship between the received back scattering signal and the water content of the leaf. The method is advantaged in that terahertz waves have high sensitivity to water molecules, and the water content of the leaf is accurately detected according to the correlation between the water state and terahertz signal attenuation transmitted through a sample.

Description

technical field [0001] The invention belongs to the technical field of water content of plant leaves, in particular to a method for detecting water content of plant leaves based on terahertz backscattering signals. Background technique [0002] At present, the water content of plant leaves is tested by destroying and calculating by drying and weighing method, but the drying method is a destructive measurement, which needs to destroy the sample, and the measurement time is very long and the steps are cumbersome. Then there are instrumental methods for measuring water content, including microwave moisture method, capacitance moisture method, neutron moisture method, electrode moisture method and so on. The general methods for measuring the water content of plant leaves are drying method, capacitance method, electromagnetic wave method, etc., but these methods are generally destructive, discontinuous and time-consuming. [0003] Existing methods for water content of plant leav...

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a method for detecting water content of plant leaves based on terahertz backscattering signals, which uses the backscattering characteristics of terahertz waves to detect plant water content, which solves the problem of existing plant water content detection methods. The method is destructive, the measurement time is long, and the steps are cumbersome. At the same time, compared with the terahertz wave transmission detection method, the detection device is simpler and has fewer devices; it is more portable, and the device can be installed on a mobile device for mobile detection; more Flexible, no need to collect leaves, can directly detect plants, and can detect from multiple angles, further solving the cumbersome problem of detection devices

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