Design And Development Of Real-time Monitoring Instrument For Plant Photosynthetic Physiology

Photosynthetic rate is an important physiological parameter of plants,the process of photosynthesis absorbing carbon dioxide to produce oxygen is one of the important ways of energy conservation and emission reduction,plant physiology can be understood by monitoring the photosynthetic rate of plants,the research on plant growth and development is of great significance,it also fully meets the scientific and technological needs of the current green development concept of "carbon peak and carbon neutralization".The existing photosynthetic physiological monitor has insufficient support in field real-time monitoring,network measurement and control integration and economic agricultural extension.Therefore,there is an urgent need for a plant photosynthetic physiological monitor with more efficient detection efficiency.Aiming at the above problems,a low-cost plant photosynthetic physiological monitor with automatic measurement and remote data transmission is designed and developed based on infrared gas analysis.The main research work of this paper is summarized as follows:(1)The hardware part completes the machining of mechanical structure and the design of measurement and control circuit according to the overall design scheme of the monitor.The mechanical structure adopts the main structure of chassis structure design and leaf chamber structure design.Independently used numerical control processing technology and 3D printing technology to complete the drawing design,production and processing of chassis and leaf chamber,the overall tightness and rigidity of the chassis are good,the blade chamber has high overall adaptability and can be opened and closed automatically.STM32F4 series microprocessor is selected for hardware circuit design,combined with external memory module,solenoid valve drive module,steering gear drive module and power supply module,the whole bottom control system has the advantages of fast processing speed,stable working state and high reliability.(2)The software part designs the access node and computing node to complete the test data acquisition and management control.The access node completes the data acquisition of carbon dioxide,air temperature and humidity,atmospheric pressure and other data and the real-time calculation of photosynthetic physiological parameters through Keil5 and other development tools.The computing node is divided into two parts.human-computer interaction interface and remote client.Human-computer interface using a combination of Python 3.5,Py Qt5 and pycharm technologies,the interaction between the monitor system and users is realized on the raspberry pie computer.The remote client is based on Net framework is developed in C# language,the online data transmission is realized through the interaction between different webform forms and database and Java Script script.(3)Finally,the functions and experimental performance of the plant photosynthetic physiological monitor were tested.The functions of the access node and computing node of the monitor are tested normally and meet the target requirements of the design scheme.A long-term performance test and comparative test were carried out in the campus and experimental station of Anhui Agricultural University,there is no significant difference between the test results and similar monitoring systems abroad,similar measurement results were obtained,it can meet the requirements of automatic monitoring of plant photosynthetic physiology.The plant photosynthesis physiology monitor designed in this paper,through relevant functional tests and experimental applications,realizes remote real-time monitoring of plant photosynthesis and other physiological parameters with stable and reliable measurement results and low cost,which is an important auxiliary role for monitoring crop growth and development,guiding crop fertilization and pest and disease prevention.