Design of Greenhouse Temperature Detection System Based on Linear Offset Interference

The agricultural industry continues to expand to a large scale, and the number of greenhouse is increasing. In order to improve the production, the control of the greenhouse is extremely important. The greenhouse environment system is complex, and the mutual coupling between the various environmental factors is surviving. Therefore, the conventional temperature detection and control method is difficult to provide optimal environmental temperature for vegetables and other crops. Aimed to detect the greenhouse temperature, and provide a basis for effective and accurate control of greenhouse temperature, an effective and improved greenhouse temperature detection system is designed based on linear offset interference principle. The detected interference fringes are collected in video. The collected images are loaded in the embedded system through the data and image processing technology. The peripheral support circuit of embedded core processor is designed. The linear model of fringe travel and the temperature is established based on linear offset interference. The image acquisition is processed for the interference fringe by CCD camera, and the images are transmitted in the core controller. The core controller takes the ARM9 embedded chip S3C2410 as the processing chip. It is has better advantages of parallel processing and real-time performance than the traditional DS18B20 temperature controller, which meets to the temperature control requirements of greenhouse. The fringe travel value is obtained with processing on thermal image. And the temperature value of the greenhouse is obtained precisely. Experiment is taken on 10 different test points, and experiment results show that the accuracy is maintained in the range of 0.02, the system and temperature detection method has prospective application value in agricultural production and greenhouse cultivation.