Design And Research Of Infra-Red Thermol Graphic Slag Detecting System Based On ARM And DSP

In steel making industry, the detection of slag carry-over within molten steel has been a challenge for over a century. The presence of slag, a byproduct of the process itself, directly reduces the quality of steel and influences the continuity of steel production. Thereby, slag detection in continuous casting is an important and practical research subject.Background of the thesis is the slag detection in open casting process and final stage of protective casting process from laddie to tundish. After investigating domestic slag detection methods and application of slag detection devices, a set of slag detection system scheme which combines embedded technology and infrared thermo graphic technology was brought forward, and system prototype was established; hardware platform consisted of infra-red thermo graphic inspector which was the sensor of system, ARM7 microprocessor and DSP digital signal processor were processing kernel; software platform consisted ofμC/OS-II embedded operating system ported on ARM7 and kinds of embedded application programs based on DSP supporting libraries. The slag detecting system design scheme has following characteristics: non-contact detection, low cost, visually display steel casting status, quantize slag amount and so on. It can help field worker to judge whether slag carry-over occurs or not, in order to effectively minimize slag amount leaked into tundish.Firstly, research background and subject were introduced, slag carry-over phenomenon in continuous casting was analyzed, and present slag detection methods were studied. Secondly, related infra-red thermo graphic technology and slag detection principle were illustrated, and system architecture and design were introduced. Thirdly, upper and lower position computers were introduced respectively, including critical modules designs of hardware and software, emphases were placed on design and debugging process of HPI communication between upper position computer and lower position computer, andμC/OS-II version 2.83 porting method on ARM7 hardware platform; experiments and debugging were made for system, then analysis and illustration of HPI communication and upper position computer software system experiment results are shown. Finally, summary of the thesis was made, system improvement direction and optimization expectations in the future were discussed.