Botanical garden greenhouse light control system based on nanofluid filtering

Abstract

The invention relates to the field of botanical garden greenhouse planting. A botanical garden greenhouse light control system based on nanofluid filtering realizes control of illumination in a botanical garden greenhouse through unique optical characteristics of nanofluid, and optimizes the illumination environment and growth effect of plants at the same time. The working process of the system is as follows: the camera installed in the botanical garden greenhouse photographs plants planted in the botanical garden greenhouse and transmits photographing information to the computer, and the computer obtains the types and growth stages of the plants planted in the botanical garden greenhouse according to the photographing information. Illumination intensity in the botanical garden greenhouse is obtained through an illumination sensor installed in the botanical garden greenhouse, and illumination intensity information is transmitted to a computer.

Description

Technical Field

[0001] The invention relates to the field of greenhouse planting in botanical gardens. Background Art

[0002] Driven by the global demand for refined plant cultivation and the goal of improving agricultural production efficiency, botanical garden greenhouse light control technology, especially greenhouse light control systems used for the cultivation of various rare plants and economic crops, is facing higher requirements and development opportunities.

[0003] Botanical greenhouses are important facilities for protecting and cultivating various plants, among which light is one of the key environmental factors affecting plant growth and development. Different plants have different requirements for light intensity and spectral distribution. However, the problem of light management in greenhouses has gradually become prominent, becoming a key factor restricting the growth rate, quality and yield of plants. Traditional greenhouse light control methods are often relatively simple, such as simply adjusting the light intensity with a sunshade net, or using ordinary glass or plastic film to cover, which makes it difficult to accurately control the spectral composition of light entering the greenhouse. Some existing light control systems lack the ability to effectively screen and regulate specific spectral bands, and cannot meet the needs of various plants for specific spectra at different growth stages. Moreover, in the process of adjusting light, energy loss and utilization efficiency are also problems that need to be solved. In addition, traditional light control systems lack sufficient flexibility in dealing with complex and changing climatic conditions. For example, under sudden strong light exposure or long cloudy days, it is difficult for existing light control equipment to quickly make precise adjustments to maintain the optimal light environment required for plant growth. In addition, different plants have very different sensitivities to changes in light, and traditional systems find it difficult to perform fine-grained light regulation based on individual differences among plants.

[0004] At the same time, nanofluids have unique optical properties and show selective absorption characteristics in the ultraviolet-visible-near infrared spectrum. For example, gold nanoparticles have a strong localized surface plasmon resonance effect in the visible light region and can selectively absorb visible light of a specific wavelength. When the particle size of gold nanoparticles is within a certain range, its absorption of the green light band is relatively strong, while its permeability to the blue and red light bands is better. Silver nanoparticles have strong absorption characteristics in the ultraviolet region and can effectively absorb specific bands in the ultraviolet spectrum. At the same time, they have a certain selectivity for permeability to the visible light band. Quantum dot nanomaterials, such as cadmium sulfide quantum dots, show special absorption characteristics in the near-infrared region, and their absorption peak position can be adjusted by changing the size of the quantum dots. Nanofluids made of these nanoparticle materials can transmit light of a specific spectrum to plants, and absorb the rest of the spectrum, especially the infrared spectrum energy, to generate heat, providing an additional source of heat for plant growth in greenhouses and improving the comprehensive utilization efficiency of energy. This brings new ideas to greenhouse lighting management. The selective absorption characteristics of nanofluids in the ultraviolet-visible-near infrared spectrum can absorb and scatter light in specific bands according to needs, providing a theoretical basis for the design of nanofluid filter modules. However, how to effectively integrate nanofluid filtering technology with greenhouse light control systems to achieve precise control of light is still a technical challenge that needs to be solved.

[0005] At present, research in the field of greenhouse light control is mostly focused on simple light intensity adjustment or single spectrum filtering, and there is a lack of intelligent light control systems that can dynamically adjust according to plant growth status and environmental conditions. Therefore, developing a system that can actively respond to the plant's demand for light and intelligently adjust the light spectrum and intensity is of great significance for improving the overall effect of plant cultivation in greenhouses and coping with the challenges of light management under complex climates and differences in plant species. Summary of the invention

[0006] The purpose of the present invention is to propose a botanical garden greenhouse light control system based on nanofluid filtering, which can control the light in the greenhouse through the unique optical properties of nanofluids, while optimizing the lighting environment and growth effect of plants.

[0007] The technical solution adopted by the present invention is: a botanical garden greenhouse light control system based on nanofluid filtering. The system uses the unique optical properties of nanofluids to control the light in the botanical garden greenhouse and optimize the lighting environment and growth effect of plants. The working process of the system is as follows: Step 1: take photos of the plants planted inside the greenhouse of the botanical garden through a camera installed inside the greenhouse of the botanical garden and transmit the photo information to a computer. The computer obtains the types and growth stages of the plants planted inside the greenhouse of the botanical garden according to the photo information, obtains the light intensity inside the greenhouse of the botanical garden through a light sensor installed inside the greenhouse of the botanical garden and transmits the light intensity information to the computer; Step 2: The computer obtains the corresponding required light intensity according to the type and growth stage of the plants planted inside the botanical garden greenhouse, and then adjusts the spectral distribution and intensity of the light incident to the botanical garden greenhouse through the nanofluid filter module installed on the top or side of the botanical garden greenhouse to meet the light intensity corresponding to the type and growth stage of the plants planted inside the botanical garden greenhouse. When the light intensity incident to the botanical garden greenhouse cannot meet the minimum light intensity requirement of the plant type and growth stage, the computer controls to turn on the fluorescent lamp installed on the top of the botanical garden greenhouse to enhance the light intensity.

[0008] The nanofluid filter module installed on the top or side of the botanical garden greenhouse adjusts the spectrum distribution and intensity incident to the inside of the botanical garden greenhouse so that the light intensity required by the types and growth stages of the plants planted inside the botanical garden greenhouse is: when the light intensity inside the botanical garden greenhouse is insufficient, the computer controls the adjustment of the nanofluid filter module, adjusts the state of the nanofluid, improves the transmittance of the spectrum beneficial to plant growth, promotes the effective use of light energy, and meets the growth needs of plants; when the light intensity inside the botanical garden greenhouse is too strong, the computer controls the adjustment of the nanofluid filter module, adjusts the state of the nanofluid, reduces the transmittance of part of the spectrum, reduces the light intensity, maintains the plants in the best light environment, and avoids damage to the plants caused by excessive light.

[0009] The present invention realizes precise control of light through innovative nanofluid application and dynamic light management strategy, improves plant growth rate, quality and yield, and promotes the progress and development of greenhouse light control technology. The present invention can actively adjust the light spectrum and intensity of the nanofluid filter module according to plant growth requirements and environmental conditions, optimize the light supply process through intelligent control strategy, and realize the intelligence and efficiency of the greenhouse light control system.

[0010] Compared with the prior art, the advantages of the technology of the present invention are: Intelligent light response mechanism: The present invention utilizes the optical properties of nanofluids to achieve intelligent and dynamic interaction between plant growth needs and light control systems. This can more accurately respond to changes in light demand and provide instant light management response than traditional single light control methods (such as shade nets, ordinary covering materials, etc.).

[0011] Spectral selective regulation: Compared with traditional light regulation methods, the nanofluid filter module can select and regulate specific spectra more accurately, significantly improving the system's light management efficiency, especially in meeting the specific spectrum requirements of different plant species and growth stages, and can effectively promote plant growth.

[0012] Dynamic light regulation: Through the dynamic changes of the nanofluid's selective absorption and scattering of light in different bands, the present invention can form a dynamic lighting environment according to the actual lighting needs of the plants. This active regulation is superior to the static lighting control method and can adjust the light spectrum and intensity according to actual needs, thereby optimizing the lighting management performance.

[0013] Adaptive light management strategy: This technology realizes adaptive adjustment of light management strategy through the intelligent algorithm function of the intelligent light control management system. It can automatically optimize the light mode according to different plant growth conditions. Compared with the fixed-mode light control system, it shows higher flexibility and efficiency.

[0014] Simplify system complexity and cost: By integrating key components such as nanofluid filtering modules and light sensors, the present invention reduces the need for additional light control equipment (such as complex spectral filters, etc.), simplifies the system structure, reduces manufacturing and maintenance costs, and improves economic feasibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the intelligent lighting management method for greenhouse plants based on nanofluid filtering and light control. DETAILED DESCRIPTION

[0016] Nanofluid filter modules are a relatively new technology, but there has been some research and development. Nanofluid filter technology has begun to be applied in optical communications and some specific optical detection and imaging fields.

[0017] The nanofluid filtering module first involves the preparation of nanofluids. For example, nanofluids made of gold nanoparticles, silver nanoparticles, cadmium sulfide quantum dots, etc. Gold nanoparticles can be prepared by chemical reduction, reducing gold salts (such as chloroauric acid) to gold nanoparticles under the action of a suitable reducing agent (such as sodium citrate). These gold nanoparticles have unique optical properties and have strong absorption and scattering capabilities for light of specific wavelengths. Silver nanoparticles can also be prepared by similar chemical methods, and they have special optical responses in the visible and near-infrared light bands. Cadmium sulfide quantum dots are formed by chemical synthesis methods under certain reaction conditions to form nanoparticles with quantum confinement effects, and their optical absorption and emission spectra can be regulated by changing the size of quantum dots. The filtering principle is to use the selective absorption and scattering characteristics of nanofluids for light of different wavelengths to achieve filtering. When light passes through the nanofluid, the nanoparticles in the nanofluid absorb or scatter light of specific wavelengths according to their own optical properties, thereby changing the spectral distribution of the light. For example, for some infrared spectrum energy that plants do not need, the nanoparticles in the nanofluid can absorb and generate heat, and transmit light of a specific spectrum to the plants.

[0018] In addition to the nanofluid itself, the nanofluid filter module also includes a container for holding the nanofluid. This container needs to have good optical transmittance and is usually made of optical glass or special optical plastic. It also includes a microfluidic system for adjusting the flow state of the nanofluid. The microfluidic system can accurately control the flow speed, direction and other parameters of the nanofluid in the filter module, thereby affecting the filtering effect. For example, by changing the flow speed of the nanofluid, the time for the light to interact with the nanofluid can be adjusted, thereby changing the filtering effect.

[0019] Installing a nanofluid filter module on the top or side lighting area of ​​a greenhouse can directly filter the light entering the greenhouse. This can adjust the spectral distribution and intensity of the light at the initial stage of light entering the greenhouse to meet the needs of plant growth in the greenhouse. For example, when sunlight shines on the top of the greenhouse, the nanofluid filter module can filter out unnecessary spectral components according to the needs of the plants, allowing only light in the spectral bands that are beneficial to plant growth to enter the greenhouse.

[0020] To achieve the above objectives, the present invention adopts the following detailed scheme: Nanofluid filter module design: Develop a nanofluid-based filter module that can adjust the spectral distribution of light and optimize the lighting environment according to changes in plant species, growth stage, and ambient light conditions. The design of the filter module needs to take into account the optical properties of the nanofluid to ensure that light control can be achieved under different light requirements.

[0021] Development Methods of Nanofluid Filter Modules: 1. Selection and preparation of nanofluids 1. Selection of Nanoparticles Choose appropriate nanoparticles based on the plant's needs for different spectra. For example, for plants that need to reduce UV damage, silver nanoparticles can be selected because they have strong absorption characteristics in the ultraviolet region. For plants that need to regulate specific visible light bands, gold nanoparticles are an option, which have a localized surface plasmon resonance effect in the visible light region and can selectively absorb and transmit light of specific wavelengths. Cadmium sulfide quantum dots can be used for spectral regulation in the near-infrared region.

[0022] Determine the particle size range of the nanoparticles. Nanoparticles of different particle sizes have different optical properties. Taking gold nanoparticles as an example, when the particle size is within a certain range, the absorption of the green light band is relatively strong, and the transmittance of the blue and red light bands is better. It is necessary to determine the particle size range suitable for the lighting needs of plants through experiments and theoretical calculations. For example, for plants that need more blue light, choose a particle size range that makes the gold nanoparticles have the best transmittance to blue light.

[0023] 2. Preparation of Nanofluids Selection of dispersant: Choose a suitable dispersant to ensure that the nanoparticles are evenly dispersed in the fluid. For gold nanoparticles, sodium citrate can be selected as a dispersant. The dispersant should not only prevent the nanoparticles from agglomerating, but also have good optical transparency to avoid affecting light transmission.

[0024] Preparation process: For gold nanoparticle nanofluids, nanoparticles can be prepared by chemical reduction method and then mixed with dispersant in a certain proportion. For example, chloroauric acid solution is slowly added with sodium citrate reducing agent solution under heating and stirring conditions to react and generate gold nanoparticles. Then, the gold nanoparticle solution is mixed with an appropriate amount of dispersant to adjust the nanoparticle concentration to a suitable range, such as 0.1~1 mol / L.

[0025] Structural design of filter module 1. Container design Choose a material with good optical transmittance to make the container, such as optical glass or special optical plastic. The shape of the container can be a simple geometric shape such as a cuboid or cylinder to facilitate processing and installation. The container needs to have sealing properties to prevent nanofluid leakage, and the connection with other components (such as liquid inlet, liquid outlet, temperature sensor, etc.) must also be considered.

[0026] 2. Microfluidic System Design The microfluidic system includes components such as inlet, outlet, flow channel and pump. The size of the inlet and outlet should be designed according to the flow demand of nanofluid.

[0027] The design of the flow channel should ensure that the nanofluid can flow stably and evenly in it. The thickness of the flow channel can be between 0.3 and 1.0 cm. The pump should be able to accurately control the flow rate of the nanofluid, such as a peristaltic pump.

[0028] Microfluidic systems must be able to achieve the circulation of nanofluids so that the state of the nanofluids can be quickly adjusted according to the light requirements. For example, by changing the flow rate of the nanofluid, the time for light to interact with the nanofluid can be adjusted, thereby changing the filtering effect.

[0029] Intelligent light control management system: Build a light control management system that integrates light sensors and intelligent control algorithms to monitor plant growth status and ambient light intensity in real time, dynamically adjust the optical properties of the nanofluid filter module, and ensure that plants grow within the optimal light range.

[0030] The system includes sensors (such as light sensors, cameras, etc.), controllers (computers), and actuators (such as pumps, valves, etc.). The light sensor is used to monitor the intensity and spectral distribution of light entering and leaving the filter module, and the temperature sensor is used to monitor the temperature of the nanofluid. Based on the data obtained by the sensor, the controller calculates the optimal flow rate, concentration and other parameters of the nanofluid according to the preset algorithm (such as the light requirement algorithm set according to the plant type and growth stage), and sends instructions to the actuator. For example, when the light sensor detects that the light in a certain band is too strong, the controller calculates that the nanofluid needs to increase its absorption of this band, so it sends instructions to the pump to increase the flow rate of the nanofluid, or sends instructions to the valve to adjust the concentration of the nanofluid.

[0031] The nanofluids (such as gold nanoparticles, silver nanoparticles, cadmium sulfide quantum dots, etc.) in the nanofluid filter module should have excellent optical selectivity, good stability and operability, and a long effective action time to meet the requirements of long-term light management in greenhouses.

[0032] Nanofluid filtering technology has been widely studied in other fields, such as solar thermal conversion systems, and is often used to improve the efficiency of photothermal conversion and improve the thermal management efficiency of photovoltaic solar cells. In biomedical imaging, nanofluid filtering technology can be used to improve imaging contrast and resolution.

[0033] There is an experimental study on the application of nanofluid filtering properties in greenhouses, titled "Experimental investigation of full solar spectrum utilization based on nanofluid spectral splitter for greenhouse applications", published in the journal Energy Conversion and Management, Volume 254 (2022) Page 115215. The study proves that nanofluid-based filters are technically and economically feasible and can effectively improve the full utilization of the solar spectrum in greenhouses. This study broadens the application of nanofluids in greenhouses and provides an effective way to improve the full utilization of solar energy.

[0034] The intelligent light control management system needs to integrate advanced light perception technologies, such as high-precision light sensors, and intelligent control algorithms, such as fuzzy logic control, neural network control or adaptive control, to achieve precise control of light.

[0035] The following are the detailed steps for building an intelligent light control management system. Those skilled in the art can implement the system based on this solution: System overall architecture The intelligent light control management system is mainly composed of light sensor module, plant growth status monitoring module, intelligent control algorithm module, nanofluid filter module and actuator.

[0036] Light sensor module Select appropriate light sensors (such as silicon photocell sensors or photodiode sensors) and determine the sensor's spectral response characteristics based on the range of the plant's photosynthetically active radiation. Reasonably arrange the sensors in the plant growth area, including evenly distributing them on the top and around small greenhouses or indoor planting environments, and setting them in layers at different heights inside the canopy of tall plants.

[0037] Plant growth status monitoring module Select parameters related to plant growth status for monitoring, establish a data acquisition system, integrate the data collected by light sensors and plant growth status monitoring equipment, and transmit them to the central control unit.

[0038] Intelligent control algorithm module A light demand model is established according to plant species and growth stages, and plant growth status parameters are incorporated into the model; PID or fuzzy logic control algorithm is used to determine PID coefficients or define fuzzy logic input and output fuzzy sets, membership functions and fuzzy rules.

[0039] Adjustment of the optical properties of nanofluidic filter modules The optical properties of nanofluids (such as absorbance, scattering coefficient, etc.) can be adjusted by changing the concentration, type or particle size of nanoparticles. For example, increasing the concentration of metal nanoparticles (such as gold nanoparticles) in nanofluids can improve the absorption capacity of light of a specific wavelength. Dynamic adjustment is achieved by using microfluidic technology or fluid circulation systems; actuators (such as micropumps and microvalves) are designed and connected to intelligent control algorithm modules to adjust optical properties according to command operations.

[0040] The lighting requirements for plant growth need to comprehensively consider the special requirements of different plant species (such as flowers, vegetables, fruits, etc.) and different growth stages (such as germination stage, seedling stage, maturity stage, etc.), to ensure that the plant growth benefits are maximized while meeting the plant lighting management needs.

[0041] The following is combined with Figure 1 and one The operation process of the intelligent greenhouse lighting management system proposed by the present invention is introduced in detail through a specific implementation case. The system combines nanofluid filtering technology to further explain the present invention in detail.

[0042] System initialization: When the greenhouse is put into use, the intelligent lighting management system is started at the same time, and the system begins to monitor the light intensity, spectral distribution and environmental conditions in the greenhouse. The specific implementation method needs to give a specific example, such as cabbage and radish. At least one specific example needs to be given in the following. Nanoparticle response: As the light conditions change, the nanoparticles in the nanofluid filter module begin to absorb and scatter light of a specific wavelength based on their unique optical properties, turning on the "light regulation mode" so that the light enters a state that matches the needs of the plants. The light regulation characteristics of nanofluids are affected by many factors, among which the concentration of nanoparticles can adjust the light intensity, the type and proportion of nanoparticles can adjust the spectral distribution, and changing the flow rate of the nanofluid can adjust the temperature rise caused by the thermal effect of the nanofluid.

[0043] Light regulation: Light that meets the needs of plant growth enters the greenhouse through the nanofluid filter module, while unnecessary spectral energy is absorbed by the nanoparticles and converted into heat. At the same time, the light sensor array continuously monitors the light conditions in different areas of the greenhouse to ensure that the light conditions remain within the optimal growth requirements of the plants.

[0044] Recovery adjustment: When the light intensity and spectral distribution return to normal levels, the nanofluid remains stable, and the system maintains a stable light environment according to the current needs of the plants, entering "stable mode". At this time, the light management system continues to monitor and only makes subtle adjustments based on minor changes in plant growth to maintain light stability.

[0045] The specific implementation steps are as follows: Material selection and preparation Metal nanoparticles or quantum dot nanoparticles are selected as key materials for light regulation because of their unique optical properties, which can absorb and scatter light in specific spectral bands.

[0046] Prepare nanofluids, mix nanoparticles with transparent solution dispersants, and use them to filter light in a specific wavelength band. The concentration of nanofluids, the types and proportions of nanoparticles need to be determined according to actual needs during the preparation process, and the effect of nanofluid flow rate on thermal effect temperature rise must be considered.

[0047] Choose suitable light-transmitting materials (such as special glass or plastic film) to construct the top light-transmitting structure of the greenhouse to ensure good light transmittance and stability.

[0048] System design and assembly The assembly layout and key dimensions of the nanofluid filter module, light sensor array, intelligent controller and heat utilization components in the greenhouse are determined, including the size of the nanofluid filter unit, the distribution position of the light sensor, etc. The influence of the characteristic regulation factors of the nanofluid on the system layout and performance should be considered. For example, different nanofluid concentrations may require different filter unit sizes to achieve the best light intensity regulation effect.

[0049] The nanofluid filter unit is installed in the light-transmitting structure on the top of the greenhouse, and each filter unit is filled with the prepared nanofluid.

[0050] The light sensor array is arranged inside the greenhouse according to the adaptive layout algorithm to ensure accurate monitoring of the lighting conditions in different areas.

[0051] A controller is installed and electrically connected to the light sensor array to receive light data.

[0052] The driving device is connected so as to be electrically connected to the controller and mechanically connected to the nanofluid filter module, thereby adjusting the illumination according to the instructions.

[0053] A heat utilization component is installed to connect the heat exchanger to the cavity of the nanofluid filter unit, and heat conduction pipes are distributed around the greenhouse planting area.

[0054] Control system development Integrated light sensors monitor light intensity and spectral distribution in different areas of the greenhouse.

[0055] Write control logic to automatically trigger the adjustment of the nanofluid filter module by the drive device based on the light signal. When writing control logic, it is necessary to fully consider the adjustment factors of the nanofluid filter characteristics, such as setting different spectral adjustment strategies according to the types and proportions of nanoparticle components, and setting temperature safety thresholds according to the impact of nanofluid flow rate on temperature rise.

[0056] It realizes the light regulation mode (when the light does not meet the growth requirements of plants, the driving device adjusts the nanofluid filter module to make the light reach a suitable state) and the stable mode (when the light meets the requirements, the current light state is maintained).

[0057] The following is a specific implementation case using a certain orchid: System Initialization When the greenhouse for growing orchids is put into use, the intelligent light management system is activated. In the initial stage, the system starts to monitor the light intensity, spectral distribution and environmental conditions in the greenhouse. For example, in the early morning, the light intensity may be only 100~200 μmol•m⁻²•s⁻¹, the spectral distribution is wide but relatively uniform covering 400~700nm, and the ambient temperature is around 18~22℃.

[0058] Nanoparticle response Light-controlled material selection and nanofluid preparation Quantum dot nanoparticles are selected as the key material for light regulation. Quantum dot nanoparticles have a unique quantum confinement effect and can accurately regulate the absorption and scattering of light in a specific spectral band. When preparing nanofluids, quantum dot nanoparticles are mixed with transparent silicone oil as a dispersant. Assume that the concentration of the nanofluid is set to 0.3% (mass fraction), which is determined by studying the growth characteristics of cultivated orchid varieties. The composition ratio of quantum dot nanoparticles has been carefully designed. For example, the ratio of cadmium selenium (CdSe) quantum dots to zinc sulfide (ZnS) shell structure quantum dots is 1:2. This composition and ratio can effectively adjust the spectral distribution to meet the orchid's needs for a specific spectrum.

[0059] How nanoparticles work As the light intensity increases in the morning, when the light intensity reaches 300 μmol•m⁻²•s⁻¹, the quantum dot nanoparticles in the nanofluid filter module begin to work. Due to the special composition and proportion of quantum dot nanoparticles, they begin to finely control the light. For example, for the red light band (620~700nm) that is particularly important for orchid growth, quantum dot nanoparticles will enhance the transmittance of this band, while for some ultraviolet bands (300~400nm) that may have an inhibitory effect on orchid growth, they absorb and scatter, making the light spectrum entering the greenhouse more in line with the growth needs of orchids.

[0060] Nanofluid filter module Double-layer glass is selected as the top light-transmitting structure material of the greenhouse. The outer glass is tempered glass with high strength and good weather resistance; the inner glass is low-iron ultra-white glass with extremely high light transmittance (up to 92% or more), which can provide sufficient and high-quality light for orchids. The nanofluid filter module is designed as multiple small filter units, each of which is 15cm×15cm×1cm in size. According to the area of ​​the greenhouse (assuming 80m²), 30 filter units are evenly installed in the top light-transmitting structure. The light sensor array is arranged in the dense layout described above, with a total of 25 sensors to ensure accurate monitoring of the light conditions in different areas. The nanofluid filter unit is installed in the top light-transmitting structure of the greenhouse, and each filter unit is filled with the prepared nanofluid. The controller is installed in the control room on one side of the greenhouse, and it is electrically connected to the light sensor array through a shielded cable to receive light data. The drive device (such as a micro peristaltic pump and an electromagnetic valve) is connected to be electrically connected to the controller and mechanically connected to the nanofluid filter module. The peristaltic pump is used to precisely adjust the flow rate of the nanofluid, and the electromagnetic valve is used to control the flow of the nanofluid between different filter units. The heat utilization component is installed to connect the heat exchanger to the cavity of the nanofluid filter unit. The heat conduction pipe is distributed in a ring around the greenhouse planting area to effectively transfer the heat converted by the nanoparticles absorbing light to the planting area to increase the temperature.

[0061] Light Control Light sensor array (light sensor) monitoring The light sensor array is set up in a special layout inside the greenhouse. Since orchids are more sensitive to environmental changes, the sensors are distributed more densely, for example, a sensor is set up every 3 meters in the four corners, center and along the perimeter of the greenhouse, with a total of 25 sensors. These sensors continuously monitor the lighting conditions in different areas of the greenhouse. When the light intensity or spectral distribution in a certain area deviates from the optimal growth range of orchids due to local shading or the influence of the greenhouse structure, the system will adjust according to the data fed back by the sensors.

[0062] The role of nanofluid filter module Light that meets the growth needs of orchids enters the greenhouse through the nanofluid filter module, while unnecessary spectral energy is absorbed by quantum dot nanoparticles and converted into heat. For example, if some overly strong blue light bands (450~480nm) exceed the suitable range for orchids, they will be absorbed by quantum dot nanoparticles, reducing the adverse effects on orchid growth.

[0063] Entering stable mode When the light intensity gradually decreases in the afternoon, for example, returning to around 200-300 μmol•m⁻²•s⁻¹, the nanofluid remains stable, and the system maintains a stable light environment according to the current growth needs of the orchid, entering "stable mode". In stable mode, the light management system continues to monitor. If the orchid's light requirements change slightly as the growth stage changes, such as from vegetative growth to reproductive growth, such as the need to adjust the spectral distribution, the system will maintain the light stability within a range suitable for orchid growth by fine-tuning the composition ratio of quantum dot nanoparticles (such as changing the ratio of CdSe to ZnS).

[0064] Control system development Light sensor integration It integrates 25 light sensors that can accurately monitor the light intensity in different areas of the greenhouse with an accuracy of ±5 μmol•m⁻²•s⁻¹ and a spectral distribution resolution of 3nm.

[0065] Control logic writing When writing the control logic, the relevant parameters are set according to the characteristics of the quantum dot nanoparticles. For example, when the light intensity is higher than 350 μmol•m⁻²•s⁻¹, the drive device will start the peristaltic pump to increase the flow rate of the nanofluid, thereby increasing the absorption and scattering of light by the quantum dot nanoparticles and reducing the light intensity.

[0066] Realize the light control mode and stable mode. In the light control mode, when the light does not meet the growth requirements of orchids (such as too high light intensity or unreasonable spectral distribution), the drive device adjusts the nanofluid filter module to make the light reach the appropriate state. In the stable mode, when the light meets the requirements, the current light state is maintained, and only minor adjustments are made according to minor changes in orchid growth (such as changes in light requirements during flowering).

Claims

1. A botanical garden greenhouse light control system based on nanofluid filtering, characterized by: The system uses the unique optical properties of nanofluids to control the lighting in the botanical garden greenhouse and optimize the lighting environment and growth effect of the plants. The system workflow is as follows Step 1: take photos of the plants planted inside the greenhouse of the botanical garden through a camera installed inside the greenhouse of the botanical garden and transmit the photo information to a computer. The computer obtains the types and growth stages of the plants planted inside the greenhouse of the botanical garden according to the photo information, obtains the light intensity inside the greenhouse of the botanical garden through a light sensor installed inside the greenhouse of the botanical garden and transmits the light intensity information to the computer; Step 2: The computer obtains the corresponding required light intensity according to the type and growth stage of the plants planted inside the botanical garden greenhouse, and then adjusts the spectral distribution and intensity of the light incident to the botanical garden greenhouse through the nanofluid filter module installed on the top or side of the botanical garden greenhouse to meet the light intensity corresponding to the type and growth stage of the plants planted inside the botanical garden greenhouse. When the light intensity incident to the botanical garden greenhouse cannot meet the minimum light intensity requirement of the plant type and growth stage, the computer controls to turn on the fluorescent lamp installed on the top of the botanical garden greenhouse to enhance the light intensity.

2. According to claim 1, a botanical garden greenhouse light control system based on nanofluid filtering is characterized by: The nanofluid filter module installed on the top or side of the botanical garden greenhouse adjusts the spectrum distribution and intensity incident to the inside of the botanical garden greenhouse so that the light intensity required by the types and growth stages of the plants planted inside the botanical garden greenhouse is: when the light intensity inside the botanical garden greenhouse is insufficient, the computer controls the adjustment of the nanofluid filter module, adjusts the state of the nanofluid, improves the transmittance of the spectrum beneficial to plant growth, promotes the effective use of light energy, and meets the growth needs of plants; when the light intensity inside the botanical garden greenhouse is too strong, the computer controls the adjustment of the nanofluid filter module, adjusts the state of the nanofluid, reduces the transmittance of part of the spectrum, reduces the light intensity, maintains the plants in the best light environment, and avoids damage to the plants caused by excessive light.

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