| The transmissivity measuring of Plume is meaningful in industry and agriculture. It is mainly used in detecting the transmissivity of atmosphere, and analyzing the structure of matter. Along with the popularization of computer, internet is already a part of our life. Therefore, embedded application with function connecting to the internet becomes the orientation in development. The combining of measuring system and internet makes measuring transmissivity more credibility and agility. The measuring system based on embedded web server can be set and visited long-distance by using internet, and can also report data and state of work. The measuring system can take full advantage of embedded system which has high integration and great reliability without maintenance. The adaptability of system in industry is improved, and the cost in industrial produce is greatly reduced. At the same time, the application request which need work outside with no workers is satisfied, and the efficiency is greatly enhanced. Every computer can use current internet browser to visit devices by making use of TCP/IP internet communication protocal.Designing the hardware and software of the remote transmissivity measuring system of plume penetrated by laser based on ARM9 is the main job. The theory of transmissivity measuring was analysed first, and then the hardware of measuring system was realized with the circuit of processing data designed. Based on the hardware implemented, some internet protocol and technology of programming were introduced first, and then embedded web server was realized based on technology of socket programming and multi-thread programming. Besides, the driver of ADC is realized based on that the structure S3C2410 was understood. The remote transmissivity measuring system of plume penetrated by laser was realized at last. And then some experiment with different conditions was carried out. According to the result, the system worked correctly. |
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