The environment of nature cannot be controlled. It is very influenced by climate in the process of biological growth and development. How to control the climate change in the process of research and obtain accurate results in a short time is what researchers have been pursuing. . The application of artificial climate chambers is to move the uncontrollable nature into the laboratory, and to create the local artificial climate with the three factors of temperature, humidity, and illumination, to seek the best growth conditions for various crops, and to explore the law of its growth and development. , Cultivate new varieties, obtain high-quality and stable production, high-yield new technologies. In computer-aided agricultural production techniques, artificial climate chambers are an effective tool for agricultural scientific research. Artificial climate simulation system consists of sensing system, measurement and control circuit and software system. In the process of developing the artificial climate box, it was widely applied to the sensing technology and the single chip technology.
Artificial climate chamber 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 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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