| In recent years, explosions in sewerage occur in Chinese cities, which are caused mostly by high concentration of combustible gas (mainly Methane) in sewerage. These explosions usually happened in the populated district.So it hinders the stabilization of the society and the safety of people. What is more, the gas in sewerage is harmful to the safety of the underground workers. Worker casualty usually happens because of lack of the gas monitoring in sewerage. Also the gases in sewerage will harm the atmospheric environment in cities.It is important to exercise automatic monitoring in sewerage network in order to prevent unexpected explosions and to protect environment.This monitoring system gathers the combustible gas information in sewerage with thermal conductivity sensor, the analog signal is sent to single chip computer after conditioning. Then the data will be converted, processed, saved and then transmitted to remote area.This paper is focused to design and improve the remote monitoring system for combustible gas in sewerage network, it functions in multi-point monitoring, GPRS based data acquisition, and mobile control with handheld cellular phones.This paper is written in two parts, hardware and software.In hardware design, the author proposed functional requirement, made the system design by selection the sensor, signal processing.In software design, the author made analysis on the main frame and sub-structure of the software though flow charts. Efforts also made on English-Chinese hybrid SMS and its transmission and receiving.At last, the experiment result has been given.The method dealt with in this thesis, is of great value in applications for urban air pollution monitoring and other unmanned monitoring situations. |
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