In order to explore the law of crop growth and development, to cultivate new varieties, and to obtain high-yield, high-quality and new technologies, the application of artificial climate chambers is even more important. Because the instrument moves the uncontrollable nature into the laboratory, it uses computers to simulate the temperature and humidity associated with the growth and development of the natural environment. In computer-aided agricultural production techniques, artificial climate chambers are an effective tool for agricultural scientific research.
The environment in the climate chamber is mainly measured by three parameters: temperature, humidity, and light. The three parameters are obtained by the respective sensors, and the non-electrical temperature, humidity, and light are converted into continuously varying analog quantities by the sensors. In this way, three probes for detecting environmental parameters are designed in the signal acquisition part of the system.
The temperature simulates the temperature change rule in the natural environment for 24 hours a day. The temperature values ​​at different times of the year are preset in the memory with an error of ?0.5e. When the difference between the measured ambient temperature and the standard temperature exceeds 0.3e, the main control performs heating/cooling to realize feedback control. The humidity value detected by the humidity sensor is actually the relative humidity in the climate chamber. The relative humidity in the natural environment is generally between 30% and 80%. When the relative humidity of the environment is lower than the preset standard relative humidity of 1%, the humidifier is activated by the 8031; otherwise, the drying fan is started to dry. Using a simulated light source, the lighting time can be set as required (spring, summer, autumn, winter). Illuminance changes according to the natural law of simulation. Using an incandescent lamp combination light source with adjustable brightness close to the sunlight spectrum, the groups of light sources are turned on/off at a set time, and simulation of natural light is performed by weak y strong y weak y dark y weak, and repeated. Its switching time and brightness are controlled by the microcontroller.
The artificial climate box system has been tested and observed for a long time and is operating well. It has certain experience in setting various parameters of the artificial climate box and has certain practical significance in guiding scientific agriculture. With the advancement of sensors and computer technology, as well as the deepening understanding of climate models, the design of artificial climate chambers will be closer to real natural effects.
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