STM32-based crop liquid flow monitoring instrument

Abstract

The invention belongs to the technical field of agricultural engineering and crop water content, and particularly relates to an STM32-based crop liquid flow monitoring instrument which comprises a single chip microcomputer, a light source connected with the single chip microcomputer, a detector, a display, a keyboard and a sample chamber connected with the light source and the detector respectively. The light source, the detector, the displayer and the keyboard are connected with the single chip microcomputer, and the sample chamber is connected with the light source and the detector. The keyboard is used for controlling the single-chip microcomputer to measure, store and display collected signals. The single chip microcomputer is used for calculating the reflectivity of the leaf at the wavelength of 970nm and 1450nm according to the collected signals, calculating the moisture index of the leaf according to the reflectivity of the leaf at the wavelength of 970nm and 1450nm and calculating the water content of the leaf according to the moisture index of the leaf, the structure is reasonable, in the using process, it can be guaranteed that the plant leaf is not damaged, the detection precision is high, detection is rapid, and the detection efficiency is high. And carrying is convenient.

Description

technical field [0001] The invention relates to the technical fields of agricultural engineering and crop water content, in particular to a crop liquid flow monitoring instrument based on STM32. Background technique [0002] Water is an extremely important environmental factor in the survival of crops, and crops can only carry out normal life activities under a certain state of cellular water content. Water is the most consumed substance during the growth and development of crops. The reaction components in each metabolic process are in the aqueous solution, and the water molecule itself is also the reactive substance of the metabolic pathway, participating in the chemical reactions of photosynthesis, respiration, fat splitting and other processes. The water content of plant leaves is an important indicator to reflect the degree of plant stress. Rapid, efficient and non-destructive detection of plant leaf water content is of great significance for the study of crop drought...

AI Technical Summary

Problems solved by technology

Among them, the standard drying method is widely used in real life because of its simple and convenient measurement, wide applicability, and high measurement accuracy. However, the drying method is destructive to the test sample and takes a long time to measure. (It needs to be dried for 24 hours) It is not repeatable, and the error is relatively large for organic soil and saline-alkali land; the acoustic emission measurement method is occasionally used in practice due to its high precision, but because of its high professional measurement requirements and application cost High reasons make it limited in practical application; commonly used spectral measurement methods include fluorescence spectrum measurement and infrared spectrum measurement, but because the moisture absorption spectrum is affected by the fluorescence spectrum in actual measurement, the measurement accuracy of the fluorescence spectrum measurement method is affected. Similarly, the general infrared light measurement method is susceptible to the influence of ambient light intensity and system noise, so it often needs to be measured in a dark room to reduce the influence of ambient light intensity, which also limits its measurement accuracy; however, near-infrared light The measurement method can often be measured without touching the measurement object. This measurement method can not only effectively measure the water content of plant leaves, but also has the advantages of less impact on plant growth, simple measurement method, and easy operation; therefore, near-infrared light measures plant leaves. Method for leaf moisture content holds great promise

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