Software Design For Distributed Optical Fiber Sensor-based Furnace Bottom Online Temperature Monitoring System

With the rapid development of economy and technology, aluminum products have been used in military and civilian industry widely. The sustainable growth of aluminum supply can’t be separated from the safe operation of electrolytic aluminum and smelting equipment, which mainly concentrates on electrolytic aluminium melting furnace and holding furnace. These devices usually run a long time under high load environment, which may cause bottom corrosion and lead to uneven heating. If can’t be found in time, it will cause leakage tank and other safety accidents. Therefore, it is imperative to monitor the temperature of bottom. However, the traditional temperature sensors can not work normally due to the environment with heavy current, high magnetic field and extremely electromagnetic interference, and it is difficult to measure temperature manually. The development of distributed optical fiber temperature sensing technology makes it possible.The subject comes from Shandong Yankuang Light Alloy limited company aluminum melting furnace and holding furnace temperature monitoring system project based on fiber. The distributed fiber optic temperature sensor can achieve the distributed measurement of temperature field with high spatial resolution and small errors. In this paper, the aluminum melting furnaces and holding furnaces’ bottom is divided into regions firstly, and circles every 3m fiber to monitor each region’s temperature. The software system needs to achieve real-time temperature monitoring, temperature warning and alarming, temperature curve display, historical data inquiry, and report printing etc. We use the high-speed data acquisition card to demodulate temperature, and the bottom data acquisition module will save the temperature data to SQL Server database. Field monitoring layer will obtain the corresponding data from the SQL Server database firstly, and then process the data.The distributed fiber optic sensing technology is studied deeply, and the Raman scattering and optical time domain reflection technology is analyzed especially in theoretically. Also, we make system requirement analysis from functional and non-functional angle, and determine the system architecture as C/S. The system is programmed by C++language, and combines techniques such as Socket communication, Multi-Threading, Databases etc. The system is divided into client and server. The server system is installed in control room. It completes data acquisition and saves data to SQL Server database. In the meantime, another process will read the data from database constantly and display information necessarily. The client system is installed on computers in the same network to achieve access to server via route.In addition, we achieve the database system modeling, and especially design the system conceptual data model and physical data model. Other information tables of database such as channel, alarm record etc. have been introduced in this paper. Finally, we introduce the system implementation emphatically, including the temperature data acquisition module, real-time curve display module, historical data inquiry module, historical curve display module, alarm module, alarm records inquiry and print module etc.At present, the system has been put into use and runs in good condition. This system achieves early warning and monitoring of bottom temperature and meets the demand of practical production well. It can predict safety accidents in advance and has important theoretical and practical significance to the safe production of aluminum industry.