PORTABLE DEVICE FOR MONITORING PLANT STRESS CONDITIONS Russian patent published in 2022 - IPC A01G7/00 G01N21/64 

FIELD: crop production.

SUBSTANCE: invention relates to optics in the field of crop production, in particular to devices for detecting stress conditions in plants. A portable device for monitoring plant stress conditions includes an excitation source, a fluorescence detector containing an optical system for imaging and separating measurement channels, an electronic trigger and delay generation unit for appropriate synchronization of the laser and the detector, and an electronic measuring unit for detecting a fluorescence signal. The excitation source is equipped with a red laser with a radiation maximum of 638 nm, a blue laser with a radiation maximum of 450 nm, a green laser with a radiation maximum of 520 nm for sequential excitation of chlorophyll fluorescence, and an illumination source in the form of a halogen lamp with continuous radiation in the range of 400÷800 nm. The lamp serves as a light source when registering the radiation transmitted and reflected from the leaves. The optical system for imaging and separating the measuring channels is made in the form of an optical fiber optic reflection and backscattering probe. The fluorescence detector is made in the form of a spectrometer with a spectral range of 350÷850 nm for recording the fluorescence spectrum transmitted and reflected from the leaves of radiation. One end of the optical fiber optic probe is connected to the spectrometer through an interference optical filter, and the other end is connected to the excitation sources. The spectrometer, excitation sources, and the electronic trigger and delay generation unit are located in the electronic measuring unit, which, in turn, is connected to a computer.

EFFECT: increasing the accuracy of determining the stress conditions of plants.

1 cl, 2 dwg