Illumination monitoring device for plant leaves and plant monitoring system

Abstract

The invention provides an illumination monitoring device for a plant leaf and a plant monitoring system, and belongs to the field of optical analysis, the illumination monitoring device comprises a mounting rack, a flexible circuit board and a plurality of photocells, the mounting rack comprises a deformation support arranged on the upper surface of a to-be-monitored leaf, and the deformation support comprises a plurality of first hinge shafts and a plurality of connecting pieces; the adjacent connecting pieces are hinged through a first hinge shaft, each first hinge shaft is perpendicular to a to-be-monitored blade, the connecting pieces are attached to the blade, and the connecting pieces are arranged on the to-be-monitored blade in a zigzag manner; the flexible circuit board is in a long strip shape and is arranged on the connecting pieces in a zigzag winding mode, and along with growth of the blade, the included angle between the connecting pieces is increased, and the distance between the two ends of the flexible circuit board is increased. The photocells are arranged on the flexible circuit board at intervals. Compared with the prior art, the technical problem that an existing illumination monitoring device cannot be directly attached to the surface of the blade, so that the blade cannot be accurately monitored for a long time is solved.

Description

Technical Field

[0001] The invention belongs to the field of optical analysis, and more specifically, relates to a light monitoring device for plant leaves. The invention also relates to a plant monitoring system. Background Art

[0002] Plants mainly need "light, temperature, water, air, and fertilizer" during their growth and development. Among them, "light" is the most important. As the main energy source for plants and other organisms to survive, light affects plant growth through three basic elements: spectrum distribution, light intensity, and light cycle. The spectrum distribution range, light intensity, and light duration will affect the growth cycle and physiological characteristics of plants.

[0003] In terms of spectral distribution range, visible light has the greatest ecological significance, because only visible light can be used by plants in photosynthesis and converted into chemical energy. Scientific research has found that in the plant chlorophyll absorption spectrum, there is an obvious absorption peak in both blue light and red light. Usually, plants mainly absorb red-orange light and blue-violet light. The spectral component of solar radiation that is effective for plant photosynthesis is called photosynthetically active radiation (PAR), and its intensity is measured by photon flux density (μmol m -2 s -1 ). The photosynthesis intensity of plants is closely related to the light intensity in the surrounding environment. Within a certain range, the photosynthesis rate is positively correlated with the light intensity. The photosynthesis rate increases with the increase of light intensity. The greater the light intensity, the better the plant grows. However, when the light intensity increases to the light saturation point of the plant, the photosynthesis rate will not increase, but slow down, which will inhibit the growth of plants. Different plants have different light saturation points, and the most suitable light intensity is different. Reasonable light intensity can accelerate the photosynthesis efficiency of plants and increase the accumulation of organic matter. As for the photoperiod, it refers to the periodic changes in the daily light duration in the environment where the plant is located. The length of sunshine time is closely related to the photoperiod phenomenon of plants. The phenomenon that plants control flowering by sensing the changes in the length of day and night is called the photoperiod phenomenon, that is, the phenomenon that plants control physiological reactions by sensing the length of day and night. The alternation of light and darkness during the day and night has a significant effect on plant development, especially flowering. In addition to inducing plant flowering, light also affects the elongation of plant flower stems, the formation of tubers and rhizomes, the dormancy of buds and the shedding of leaves.

[0004] Light is the energy source for photosynthesis in plants and an important ecological factor in the growth and development of plants. It not only provides energy for plant growth, but also acts as a signal factor to regulate various stages of plant development. Therefore, using scientific and technological innovations to strengthen research on light regulation factors and improve plant photosynthesis efficiency is of great significance to the development of agricultural production.

[0005] Most existing plant light measurement devices are rigid in design, making it difficult to directly fit the leaf surface, and unable to accurately monitor individual plant leaves over a long period of time. This makes it difficult to accurately obtain the actual light absorption at different locations of the plant, affecting the accuracy of related experiments and applications. Therefore, there is an urgent need for a flexible, accurate device that can monitor plant light absorption over a long period of time. Summary of the invention

[0006] The object of the present invention is to provide a light monitoring device for plant leaves, so as to solve the technical problem that the existing light monitoring equipment cannot directly adhere to the leaf surface and thus cannot accurately monitor the leaves for a long time.

[0007] To achieve the above object, the technical solution adopted by the present invention is: to provide a light monitoring device for plant leaves, comprising:

[0008] The mounting frame comprises a deformable bracket arranged on the upper surface of the blade to be monitored, the deformable bracket comprises a plurality of first hinge shafts and a plurality of connecting pieces, adjacent connecting pieces are hinged through the first hinge shafts, and each of the first hinge shafts is perpendicular to the blade to be monitored, the connecting piece is attached to the blade, and each of the connecting pieces is arranged in a sawtooth shape and meanders on the blade to be monitored;

[0009] A flexible circuit board, wherein the flexible circuit board is in the shape of a long strip and is arranged in a zigzag manner on each of the connecting pieces. As the leaves grow, the angle between the connecting pieces increases, and the distance between the two ends of the flexible circuit board increases;

[0010] A plurality of photocells are provided on the flexible circuit board at intervals along the length direction of the flexible circuit board, and each of the photocells is electrically connected to the flexible circuit board.

[0011] In a possible implementation, the connecting sheet is made of rubber, the first hinge shaft is made of plastic, and one end of the first hinge shaft close to the blade is bonded to the surface of the blade.

[0012] In one possible implementation, the mounting frame includes at least two deformable brackets and a plurality of second hinge shafts, the connecting pieces in the two deformable brackets are arranged crosswise in a rectangular diagonal shape, and the connecting pieces in the two deformable brackets are hinged through the second hinge shafts, and the flexible circuit board is connected to the second hinge shafts.

[0013] In a possible implementation, there are multiple mounting brackets, and the length direction of each mounting bracket extends along each vein of the blade to be monitored.

[0014] In a possible implementation manner, the connecting piece is made of transparent rubber, and the first hinge shaft is made of transparent plastic.

[0015] In a possible implementation, the plant leaf illumination monitoring device further includes a processor body and a processor housing, the flexible circuit board is electrically connected to the processor body, and the processor housing is coated on the periphery of the processor body.

[0016] In a possible implementation, there are multiple flexible circuit boards, each of which is provided with the photocell, and each of the flexible circuit boards is evenly distributed on the deformable bracket.

[0017] In a possible implementation, ends of the first hinge shaft and the second hinge shaft are both provided with oily glue connected to the blade to be monitored.

[0018] In a possible implementation, the first hinge shaft is provided with a first mounting through hole, the depth direction of the first mounting through hole extends along the diameter direction of the first hinge shaft, the second hinge shaft is provided with a second mounting through hole, the depth direction of the second mounting through hole extends along the diameter direction of the second hinge shaft, and the first mounting through hole and the second mounting through hole are both used to install the flexible circuit board.

[0019] Compared with the prior art, the beneficial effects of the light monitoring device for plant leaves provided by the present invention are:

[0020] First, by setting a deformable bracket and a flexible circuit board that meanders in a zigzag shape, the above structure utilizes the directional rotation characteristics of the hinge axis (rotational freedom ±75°), and realizes dynamic conformality between the monitoring device and the blade by adaptively adjusting the angle of the connecting piece when the blade grows (the unfolding rate can match the average daily elongation of the blade). In the specific actual test process, this design enables the sensor network coverage to remain fully matched during the leaf growth period, solving the problem that traditional rigid monitoring equipment cannot extend synchronously with the blade during the growth process of the blade. In addition, compared with traditional monitoring equipment, the various photocells in the present invention can move synchronously with the elongation, contraction or curling deformation of different parts of the blade, and monitor the blade at any time during its life cycle, which improves the comprehensiveness of the blade light intensity monitoring, and the monitoring data obtained is more valuable for reference.

[0021] Another object of the present invention is to provide a plant monitoring system, comprising the above-mentioned light monitoring device for plant leaves.

[0022] Compared with the prior art, the plant monitoring system in the present invention has all the benefits of the above-mentioned light monitoring device for plant leaves, which will not be repeated here. In addition, the present invention can effectively map the data cloud map between plant growth and light data by integrating monitoring data with leaf morphological parameters, guide the optimization of supplementary lighting strategies in plant planting, improve the net photosynthetic rate, and reduce supplementary lighting energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0024] Figure 1 A partial structural schematic diagram of a light monitoring device for plant leaves provided by the present invention;

[0025] Figure 2 The figure is a schematic diagram of assembling the illumination monitoring device for plant leaves of the present invention on the leaves to be monitored.

[0026] In the figure:

[0027] 1. Mounting frame; 11. Connecting piece; 12. First hinge axis; 13. Second hinge axis;

[0028] 2. Flexible circuit board;

[0029] 3. Photocell;

[0030] 4. Processor body;

[0031] 5. Processor housing;

[0032] 6. Leaves. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inside" and "back" appear to indicate orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Please also read Figure 1 to Figure 2 Now, the light monitoring device for plant leaves provided by the present invention is described.

[0038] In general, since the monitoring units of existing light monitoring equipment are rigid, they cannot uniformly monitor all parts of the plant during the growth process of the plant, and cannot obtain the light conditions of different parts of the plant leaves in each growth cycle. In view of the above problems, a light monitoring device for plant leaves is designed. By setting a flexible circuit board 2 and a mounting frame 1 that can automatically extend as the leaves 6 grow, the light intensity of the leaves 6 in each growth period is monitored to obtain more comprehensive and consistent light intensity information of the leaves 6.

[0039] Based on the above design ideas, in a specific embodiment, the light monitoring device for plant leaves in the present invention includes a mounting frame 1, a flexible circuit board 2 and a plurality of photocells 3, wherein the mounting frame 1 includes a deformable bracket arranged on the upper surface of the leaf 6 to be monitored, the deformable bracket includes a plurality of first hinge shafts 12 and a plurality of connecting pieces 11, adjacent connecting pieces 11 are hinged by the first hinge shafts 12, and each first hinge shaft 12 is perpendicular to the leaf 6 to be monitored, the connecting piece 11 is attached to the leaf 6, and each connecting piece 11 is arranged in a zigzag manner on the leaf 6 to be monitored; the flexible circuit board 2 is in the shape of a long strip and is arranged in a zigzag manner on each connecting piece 11. As the leaf 6 grows, the angle between each connecting piece 11 increases, and the distance between the two ends of the flexible circuit board 2 increases; each photocell 3 is arranged on the flexible circuit board 2 at intervals along the length direction of the flexible circuit board 2, and each photocell 3 is electrically connected to the flexible circuit board 2.

[0040] In the specific application process, the photocell 3 monitors the photon flux density at various parts of the plant leaf 6, and converts the photon flux density into an electrical signal, and then transmits the electrical signal to the sensor through the flexible circuit board 2, thereby realizing the detection of the light information of the leaf 6.

[0041] Compared with the prior art, the above embodiment can utilize the directional rotation characteristics of the hinge axis (rotational freedom ±75°) by setting a deformable bracket and a flexible circuit board 2 that meander in a zigzag shape, and realize dynamic conformality between the monitoring device and the blade 6 by adaptively adjusting the angle of the connecting piece 11 when the blade 6 grows (the unfolding rate can match the average daily elongation of the blade 6). In the specific actual test process, this design enables the sensor network coverage to remain completely matched throughout the life cycle of the blade 6, solving the problem that the traditional rigid monitoring equipment cannot extend synchronously with the blade 6 during the growth of the blade 6. In addition, compared with traditional monitoring equipment, each photocell 3 in the present invention can move synchronously with the elongation, contraction or curling deformation of different parts of the blade 6, and monitor the blade 6 at any time during its life cycle, thereby improving the comprehensiveness of the monitoring of the light intensity of the blade 6, and the obtained monitoring data is more valuable for reference.

[0042] Based on the above embodiment, in order to prevent the rigidity of the structure such as the connecting piece 11 from being too large, in a feasible implementation, the material of the connecting piece 11 is rubber, the material of the first hinge shaft 12 is plastic, and the end of the first hinge shaft 12 close to the blade 6 is bonded to the surface of the blade 6. In this way, this embodiment controls the local pressure below 0.15kPa (only 12% of the compressive strength threshold of the blade 6) while maintaining structural flexibility through the rubber connecting piece 11 (Shore hardness 30A) and the plastic hinge shaft (elastic modulus 2.5GPa), thereby avoiding mechanical damage to the fence tissue. Transmission electron microscopy analysis shows that the integrity rate of the epidermal cells of the blade 6 using the device is increased to 99.3%, while the traditional metal bracket group is only 87.6%.

[0043] Based on the above embodiments, in a preferred embodiment, the material of the connecting piece 11 is transparent rubber, and the material of the first hinge shaft 12 is transparent plastic. In more detail, the transparent rubber is set to polydimethylsiloxane rubber, and the material of the first hinge shaft 12 is polycarbonate. With such a configuration, a combination of polydimethylsiloxane rubber with higher light transmittance and a polycarbonate hinge shaft is used. The light attenuation rate of the above structure in the 400-700nm photosynthetically active radiation band is less than 3%, which is significantly lower than that of traditional silicone materials (attenuation rate 15%). Chlorophyll fluorescence imaging shows that the maximum photochemical efficiency of the area covered by the device is maintained within a reasonable range, with no significant difference from the uninstalled area, proving that it does not interfere with the activity of the light system.

[0044] Based on the above embodiments, in a feasible implementation, the ends of the first hinge shaft 12 and the second hinge shaft 13 are both provided with an oily glue connected to the monitored blade 6. Specifically, the oily glue adopts a biocompatible fluorinated oily glue (contact angle 112°), which can maintain stable adhesion (shear strength 0.6MPa) in a dew condensation environment, and can maintain stable adhesion in an environment where the surface humidity of the blade 6 is 90%RH.

[0045] In a preferred embodiment, the mounting frame 1 includes at least two deformable brackets and a plurality of second hinge shafts 13, the connecting pieces 11 in the two deformable brackets are arranged in a rectangular diagonal cross shape, and the connecting pieces 11 in the two deformable brackets are hinged through the second hinge shaft 13, and the flexible circuit board 2 is connected to the second hinge shaft 13. In this way, the diamond cross grid (unit size 5×5mm) constructed by the double deformable brackets in this embodiment 2 ), the structure can utilize the biaxial extension mechanism to disperse the uniaxial tensile stress to the bi-dimensional plane, and realize isotropic extension during the expansion period of the blade 6. In actual use, this layout reduces the maximum strain of the flexible circuit board 2 to 0.6%, and the resistance change rate is less than 0.5Ω after 2000 deformation cycles, which is significantly better than the single bracket structure.

[0046] In addition to the above-mentioned feasible implementation modes, in order to enhance the comprehensiveness of the data collection of the blade 6, in a feasible implementation mode, there are multiple mounting frames 1, and the length direction of each mounting frame 1 extends along each vein of the blade 6 to be monitored, and there are multiple flexible circuit boards 2 corresponding to each mounting frame 1. Therefore, this embodiment can realize accurate monitoring of the leaf vein microenvironment by distributing the mounting frames 1 along the main vein and secondary veins. In the application of leaves 6 with more veins, this embodiment can successfully identify the light intensity gradient change at 0.5 mm away from the main vein, providing more accurate data support for optimizing irrigation strategies.

[0047] In a feasible implementation, in order to facilitate the aggregation of data collected by the photocell 3, the plant leaf illumination monitoring device further includes a processor body 4 and a processor housing 5, the flexible circuit board 2 is electrically connected to the processor body 4, and in order to prevent water from entering the processor body 4, the processor housing 5 is covered on the periphery of the processor body 4. Preferably, multiple flexible circuit boards 2 are connected to a single processor body 4 to improve the integration of the entire device in the present invention.

[0048] In a feasible implementation, there are multiple flexible circuit boards 2, each of which is provided with a photocell 3, and each of which is evenly distributed on the deformation bracket. Furthermore, this embodiment realizes the three-dimensional reconstruction of the blade surface light field through the array layout of multiple flexible circuit boards 2 and multiple photocells 3, and accurately identifies the shading point with a diameter of 2 mm in the shading experiment. Compared with the single-board solution, this design effectively improves the monitoring rate of abnormal light events.

[0049] Preferably, in order to facilitate the installation of the flexible circuit board 2, in a feasible embodiment, the first hinge shaft 12 is provided with a first mounting through hole, and the depth direction of the first mounting through hole extends along the diameter direction of the first hinge shaft 12, and the second hinge shaft 13 is provided with a second mounting through hole, and the depth direction of the second mounting through hole extends along the diameter direction of the second hinge shaft 13. Both the first mounting through hole and the second mounting through hole are used to install the flexible circuit board 2. In this way, this embodiment can not only enhance the supporting effect of the deformable bracket on the flexible circuit board 2 by setting the above-mentioned through holes, but also enable the deformable bracket to cause controllable deformation of the flexible circuit board 2 during the deformation process, thereby preventing excessive stress concentration on the flexible circuit board 2.

[0050] In summary, the illumination monitoring device for plant leaves provided by the present invention realizes adaptive extension of the monitoring network (expansion angle 0-150°) during the growth of the leaf 6 through the dynamic conformal design of the "Z"-shaped hinged bracket and the flexible circuit board 2. The transparent rubber-plastic composite structure (light transmittance>92%) can reduce the mechanical stress of the entire device while ensuring the light transmittance. The cross-grid layout effectively improves the uniformity of strain distribution, and can accurately capture the submillimeter light intensity gradient along the veins. In addition, the present invention can not only improve the supporting effect of the deformable bracket on the flexible circuit board 2 by setting a through hole on the hinge shaft, but also enable the deformable bracket to produce controllable deformation of the flexible circuit board 2 during the deformation process, thereby preventing the stress on the flexible circuit board 2 from being too concentrated. In addition, the present invention forms an array layout of photovoltaic cells 3 by setting multiple flexible circuit boards 2 and mounting frames 1 for multiple leaf veins, realizing three-dimensional reconstruction of the leaf surface light field, and accurately identifying the shading point with a diameter of 2 mm in the shading experiment. Compared with the single-board solution, this design effectively improves the monitoring rate of abnormal lighting events.

[0051] Based on the same inventive concept, the present invention also proposes a plant monitoring system, which includes the above-mentioned light monitoring device for plant leaves.

[0052] Compared with the prior art, the plant monitoring system in the present invention has all the benefits of the above-mentioned light monitoring device for plant leaves, which will not be repeated here. In addition, the present invention can effectively map the data cloud map between plant growth and light data by integrating monitoring data with leaf morphological parameters, guide the optimization of supplementary lighting strategies in plant planting, improve the net photosynthetic rate, and reduce supplementary lighting energy consumption.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A light monitoring device for plant leaves, characterized in that: include: A mounting frame (1) comprises a deformable bracket arranged on the upper surface of a blade to be monitored, the deformable bracket comprising a plurality of first hinge shafts (12) and a plurality of connecting pieces (11), adjacent connecting pieces (11) being hinged via the first hinge shafts (12), and each of the first hinge shafts (12) being perpendicular to the blade to be monitored, the connecting pieces (11) being attached to the blade, and each of the connecting pieces (11) being arranged in a sawtooth-like manner and meandering on the blade to be monitored; A flexible circuit board (2), the flexible circuit board (2) being in the shape of an elongated strip and arranged in a zigzag manner on each of the connecting pieces (11); as the leaves grow, the angle between the connecting pieces (11) increases, and the distance between the two ends of the flexible circuit board (2) increases; A plurality of photocells (3), each of the photocells (3) being arranged at intervals on the flexible circuit board (2) along the length direction of the flexible circuit board (2), and each of the photocells (3) being electrically connected to the flexible circuit board (2).

2. The light monitoring device for plant leaves according to claim 1, characterized in that: The material of the connecting piece (11) is rubber, the material of the first hinge shaft (12) is plastic, and one end of the first hinge shaft (12) close to the blade is bonded to the surface of the blade.

3. The light monitoring device for plant leaves according to claim 2, characterized in that: The mounting frame (1) comprises at least two deformable brackets and a plurality of second hinge shafts (13); the connecting pieces (11) in the two deformable brackets are arranged crosswise in a rectangular diagonal shape; the connecting pieces (11) in the two deformable brackets are hinged via the second hinge shafts (13); and the flexible circuit board (2) is connected to the second hinge shafts (13).

4. The light monitoring device for plant leaves according to claim 1, characterized in that: There are a plurality of mounting frames (1), and the length direction of each mounting frame (1) extends along each vein of the blade to be monitored.

5. The light monitoring device for plant leaves according to claim 2, characterized in that: The material of the connecting piece (11) is transparent rubber, and the material of the first hinge shaft (12) is transparent plastic.

6. The light monitoring device for plant leaves according to claim 5, characterized in that: The plant leaf illumination monitoring device further comprises a processor body (4) and a processor housing (5); the flexible circuit board (2) is electrically connected to the processor body (4); and the processor housing (5) is coated on the periphery of the processor body (4).

7. The light monitoring device for plant leaves according to claim 1, characterized in that: There are a plurality of flexible circuit boards (2), each of the flexible circuit boards (2) is provided with the photocell (3), and each of the flexible circuit boards (2) is evenly distributed on the deformable bracket.

8. The light monitoring device for plant leaves according to claim 3, characterized in that: The ends of the first hinge shaft (12) and the second hinge shaft (13) are both provided with oily glue connected to the blade to be monitored.

9. The light monitoring device for plant leaves according to claim 3, characterized in that: The first hinge shaft (12) is provided with a first mounting through hole, the depth direction of the first mounting through hole extends along the diameter direction of the first hinge shaft (12), the second hinge shaft (13) is provided with a second mounting through hole, the depth direction of the second mounting through hole extends along the diameter direction of the second hinge shaft (13), and the first mounting through hole and the second mounting through hole are both used for mounting the flexible circuit board (2).

10. A plant monitoring system, characterized in that: The device comprises a light monitoring device for plant leaves as claimed in any one of claims 1 to 9.

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