CN104007143A - Simple plant water-shortage detection mechanism - Google Patents

Abstract

The invention mainly discloses a simple plant water shortage detection mechanism, which includes multiple sets of strain gauges for measuring deformation and strain gauges for receiving strain gauge data attached to the main stems and leaves of plants. The sheet consists of a straight strain gauge and a tangential strain gauge. The straight strain gauge is set along the straight line of the plant main stem or the main vein of the leaf, and the tangential strain gauge is set along the vertical direction of the plant main stem or the main vein of the leaf. , and there are at least one set of strain gauges on the main stem and leaves of the plant respectively, and each of the strain gauges is connected to the strain gauge through connecting wires. The plant water shortage detection mechanism provided by the present invention uses the change principle of resistance value to measure the current water content of the plant more accurately from the perspective of the plant body, and judge whether the plant is currently short of water and whether the water content is sufficient, and the detection The mechanism structure is simple, the operation is convenient, the measurement is accurate, and the utility model is suitable for popularization and application.

Description

A Simple Plant Water Deficiency Detection Mechanism

technical field

The invention belongs to the technical field of precision agriculture application, and in particular relates to a simple plant water shortage detection mechanism.

Background technique

Water is the main component of plants. The water content of aquatic plants is the highest, up to 98%; the water content of herbaceous plants is about 70% to 80%; the water content of woody plants is less, about 40% to 50%; Plants living in desert areas have very little water content, only 16%. Without water there is no life. Water is a solvent for many substances. Minerals, oxygen, and carbon dioxide in the soil must be dissolved in water before they can be absorbed and utilized by plants. Water can also maintain the tension of cells and tissues, and keep plant organs upright, so as to facilitate the normal progress of various metabolisms. Water is the raw material for photosynthesis to produce organic matter, and it also participates in many biochemical processes in plants as a reactant, so water is particularly important for the life activities of plants.

DTR technology is popular abroad to monitor the water content of plants. This technology is not only costly, but also needs to use DTR waveguide probes to insert into plants, which will cause certain damage to plants, especially when monitoring precious species. There are also some methods in China that monitor plant water shortage by measuring plant resistance, capacitance and other characteristics. Recently, there have also been monitoring by measuring plant electrical impedance, but they all use probes to insert into plants. Creative design company Koubachi launched a special alarm in 2012 - a wireless water shortage sensor. Insert the wireless water shortage sensor into the soil, it can detect the local soil conditions and plant species, and transmit the data to the existing iOS application through Wifi in the home network, and then the application will tell the user when it is appropriate to water. Water, spray or fertilize, and the calculation of these data is all done by the wireless water shortage sensor. However, the water shortage sensor is placed in the soil, which is somewhat different from the water content of stems and leaves, and does not measure the current water content of plants well.

Contents of the invention

The purpose of the present invention is to provide a simple plant water shortage detection mechanism for the problem that the current water content of plants cannot be better detected in the prior art. The detection mechanism can more accurately measure the current water content of plants and determine Whether the plants are currently short of water and whether the water content is sufficient.

The technical solution adopted by the present invention to achieve the above object is: a simple plant water shortage detection mechanism, including multiple groups of strain gauges for measuring deformation and for receiving strain gauge data Each set of strain gauges consists of a straight strain gauge and a tangential strain gauge, the straight strain gauges are set along the straight line of the plant main stem or leaf main vein, and the tangential strain gauges are set along the plant main stem or The main veins of the leaves are arranged vertically, and there are at least one set of strain gauges on the main stems and leaves of the plant respectively, and each of the strain gauges is connected to the strain gauges through connection lines.

Beneficial effects of the present invention

The plant water shortage detection mechanism provided by the present invention uses the change principle of resistance value to measure the current water content of the plant more accurately from the perspective of the plant body, and judge whether the plant is currently short of water and whether the water content is sufficient, and the detection The mechanism structure is simple, the operation is convenient, the measurement is accurate, and it is suitable for popularization and application.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Reference signs: 1, straight strain gauge, 2, tangential strain gauge, 3, connecting wire, 4, strain gauge.

Detailed ways

As shown in the figure: a simple plant water shortage detection mechanism, including multiple sets of strain gauges for measuring deformation and strain gauges 4 for receiving strain gauge data attached to the main stems of plants and the main veins of leaves, each The set of strain gauges consists of a straight strain gauge 1 and a tangential strain gauge 2, the straight strain gauge 1 is set along the straight line of the plant main stem or the main vein of the leaf, and the tangential strain gauge 2 is arranged along the plant main stem or leaf The main vein is arranged vertically, and there are at least one set of strain gauges on the main stem and leaves of the plant respectively, and each strain gauge is connected to the strain gauge 4 through the connection line 3 respectively.

The strain gauge is a resistance gauge. When the strain gauge is attached to the main stem of the plant, the diameter of the stem will change slightly when the plant is short of water. At this time, the tangential strain gauge 2 is affected by the diameter change, and its shape also changes At the same time, the plant epidermis will also shrink slightly, and the shape of the vertical strain gauge 1 will also change due to the change in length; the shape of the strain gauge 1 changes, causing the resistance to change, and the strain gauge 4 connected to the strain gauge The change of corresponding generation data on the above, when the data change on the strain gauge 4 is larger, it shows that the plants lack more. When the strain gauge is pasted on the main vein of the blade, the diameter of the main vein will change slightly when the plant is short of water, and the shape of the tangential strain gauge 2 will change slightly; Due to the gravity of the earth, the leaf produces a downward displacement and a small torque, and the shape of the vertical strain gauge 1 changes slightly. At this time, the strain gauge 4 will display a certain value according to the change of diameter and the generation of torque. We can tell whether the plants are short of water and whether the lack of plants is serious according to the difference of the data on the strain gauge 4 and the position of the strain gauges. The plant water shortage detection mechanism provided by the present invention uses the change principle of resistance value to measure the current water content of the plant more accurately from the perspective of the plant body, and judge whether the plant is currently short of water and whether the water content is sufficient, and the detection The mechanism structure is simple, the operation is convenient, the measurement is accurate, and it is suitable for popularization and application.

Since the plants themselves are constantly growing, the strain gauges need to be replaced regularly, generally every 4-7 days.

Experimental data

Subject: Cucumber main vines and petiole main veins

Tests show that: for the strain gauges attached to the main cucumber vine, when the water content of the main cucumber vine is 55-90%, the tangential strain gauge 2 wrapped around the main vine shrinks by 0.15mm for every 10% decrease in water content.

The strain gauge attached to the main vein of the petiole, when the water content of the main vein of the petiole is 55-90%, the water content decreases by 10%, the straight strain gauge 1 is stretched by 0.33mm, and the tangential strain gauge 2 shrinks by 0.11mm.

Claims (1)

1. A simple and easy plant water shortage detection mechanism is characterized in that: comprising a plurality of groups of strain gauges for measuring deformation and strain gauges (4 ), each set of strain gauges consists of a vertical strain gauge (1) and a tangential strain gauge (2), the vertical strain gauge (1) is set along the straight line of the plant main stem or leaf main vein, the tangential strain gauge The sheet (2) is arranged along the vertical direction of the main stem of the plant or the main vein of the leaf, and there are at least one set of strain gauges on the main stem and leaf of the plant respectively, and each of the strain gauges is connected to the strain gauge through the connecting line (3) (4) CONNECTION.