The Research Of Fire Pre-warning System In The Coal-mining Area Based On Infrared Image

In the mine area,Oxidation reaction is easy to occur for Phosphorus mine at roomtemperature.It will generate a lot of heat during this process.What’s worse,it may cause firewhich brings serious threat to people’s life and property. Therefore,monitoring and earlywarning is very important in the field of fire protection. However, due to the limitations ofconventional thermal and smoke alarm methods, fire detection method based on infraredimaging is increasingly attracting people’s attention.With the development of infrared thermal imaging technology,infrared imaging systemhas been widely used in military and civilian fields. Uncooled infrared imaging systemoccupies an important position in the development of infrared thermal imaging system withits low price, high reliability,small size and low power consumption.For the purpose ofexpanding uncooled infrared thermal image system in various areas,the uncooled infraredtechnology was used in coal mine fire warning system,we designed an early warning systembase on uncooled infrared thermal image.To discover the fire earlier,we could analyse characteristics of infrared image.in otherwords,we can use uncooled infrared detector to get the infrared image after the smoke.then,wecan extract the fire area.At last,we will use the algorithm of temperature and area change rateto make sure whether there is a fire.The selection of device basically determines the performance of the entiresystem.According to our needs, we focus on the selection of uncooled focal plane detector,embedded processors (ARM) and complex programmable logic array (CPLD),and then weanalyse the local hardware circuit design. we draw the diagram of system and PCB by AD tobuild the entire hardware system. The hardware system includes image recognition module,ARM processing module, CPLD module, peripheral interface module and so on. so we canrealize image storage, processing and transmission. In addition, we use TI’s CCS5.3development environment, and choose μC/OS-II system as an embedded operating system.Meanwhile, we move the μC/OS-II operating system into our hardware platform. Then wecreate four tasks in the operating system, the tasks are fire detection task, Ethernet task, serialtask and data management task. we choose quartus II as the development environment ofCPLD and use Verilog HDL hardware programming language for programming andsimulation.Finally, we will debug the hardware environment to ensure the normal operation of every part of the circuit.Moreover,we will observe the input image signal and the outputsignal of CPLD with an oscilloscope to detect whether the program is correct. The last step isto test whether the Ethernet port is properly connected.