Implementation Of Gas Monitoring System Based On Multi-sensor Fusion Technology

In China coal industry, coal mine gas accident is currently the biggest disaster, which has become a major constraining factor in production of coal mine safety. Therefore, in order to enhance safety monitoring for coal mine production, a multi-sensor fusion technology based on gas monitoring system is present in this paper, which can effectively prevent and contain coal mine accidents.This paper first simply introduces the development status on gas safety inspection system. According to the modern research status and challenges, this paper puts forward a new gas monitoring system based on multi-sensor data fusion method. As the in-well coal mine environment is complex, if using a single sensor only part information under well can be obtained, which is not easy to do the accurate gas detection. So multiple combinations of the same or different sensors usually need obtain complementary information or increase the capacity of interference. Therefore, in order to improve the reliability of the monitoring system, this paper uses multi-sensor information fusion method to fusion multi-sensor data underground coal mine.The paper first proposes two fusion methods of local integration and global integration to fusion multi-sensor data underground coal mine. Arithmetic average of multi-sensor approach combined with the batch estimation algorithm is used as the local integration algorithm, and the evidence theory is used as a global fusion algorithm. This paper theoretically studies and analysis these two methods, and demonstrates the effectiveness of the two fusion methods by combining the test data.According to the relevant national standards and industry standards the overall program on monitoring system is designed, which explains its working principle and function. The system can simultaneously monitor the concentration of methane, carbon monoxide and other dangerous gases and temperature and humidity in the coal mine. When a certain gas concentration or field temperature exceeds the limits, sub-station in coal mine can quickly transmit alert information to host computer in a very short period of time via CAN bus, then host computer can quickly give instruction to the sub-station in coal mine to adjust the ongoing work status and operation alarm. According to its function of gas monitoring system, respective hardware and software are designed. As for hardware, ARM LPC2290 is used as the core processor of the system, and a data acquisition circuit, CAN bus interface circuit, backup power and power management circuits are designed. As for software, work flow diagram of each module is designed, and the features of each module and work flow chart are discussed. The CAN bus transmission characteristics of packet are mainly analyzed, and transport protocol for the sub-station in the coal mine is designed.The result shows that the system's comprehensive functionality and performance have basically achieved the desired objectives and requirements, the system can realize effective gathering of coal mine pit data,and the important data information for the next step improvement and perfection can be provided.