| Popis: |
To solve the difficulty of Chinese scientific examiner eating fresh vegetables in Antarctica station, a greenhouse in the research station was built. It is the first natural light greenhouse in Antarctic land. Running in the severe environment, the greenhouse has the problem of unattended operation and no professional cultivation, and thus demands high reliability. An automatic control system for the Antarctic greenhouse was developed to create a good environment for crop growth. The system is composed of a computer, an environment controller, a data collector, sensors, actuators, and so on. In the greenhouse, environmental parameters are collected and sent to computer for processing and displaying by an environment controller connecting to the data collector for acquisition. In extremely cold area, temperature is the primary factor for a greenhouse, which is heated by water pipes. The fuzzy logic was used to automatically adjust the heating pipe opening according to the measured ambient temperature for temperature control. Sodium lamp and LED were used to supplement light in greenhouse according to Photosynthetic effective value. With controlling the greenhouse’s top cover, side cover, and the natural light supplement, it could simulate the diurnal variation and the seasons change to facilitate plant growth. The greenhouse is irrigated in the tidal irrigation way. For different plants, it is convenient to adjust the irrigation time and duration for greenhouse workers. According to the control strategy, the main factors such as temperature, illumination, and fertilizer of the greenhouse environment are automatically adjusted. Since it was installed in the Antarctica Great Wall Station, the system has proved to run stably with long time monitoring data, providing a guarantee for fresh vegetables supply for resident scientific examiner. |
