【文章內(nèi)容簡介】 讓我在畢設(shè)期間學到了很多未接觸過的新知識，得到了不少啟發(fā)。在這里我還要深深的感謝我的家人，是你們的質(zhì)樸和勤勞給我創(chuàng)造了大學的學習機會，你們的關(guān)心和支持，是我永遠的精神支柱和動力源泉。請你們相信我在最后的時間里也會很好的完成我的大學生活和學習！附 錄1傳感器終端節(jié)點硬件電路原理圖協(xié)調(diào)器節(jié)點硬件電路圖附 錄2電路元器件參數(shù)列表元件類型參數(shù)值功能備注CC2CAP22pF連接32MHz晶振電路CC6CAP220nF去耦合，為電源濾波，提高芯片穩(wěn)定性CC5CAP15pF低功耗設(shè)計C7CAP100nF去耦合，為電源濾波，提高芯片穩(wěn)定性C8CAP47uF改善負載瞬態(tài)響應(yīng)和噪聲抑制功能CC11CAP去耦合，為電源濾波C10CAP10uF穩(wěn)定電源輸出D1LED發(fā)光報警L1INDUCTOR22nHL2INDUCTORM1MOTOR振動報警MK1MICROPHONE發(fā)聲報警QQQ3MMBT2904TT1G三極管，為報警電路提供合適電流R1REST56K偏置電阻，為32MHz晶振提供合適電流R2REST43K偏置電阻R3REST300負載電阻，表現(xiàn)傳感器內(nèi)敏感電阻的變化R4REST10K上拉電阻，使信號升高R5REST250K保證電壓輸出穩(wěn)定R6REST1K限流電阻R7REST120終端匹配電阻Y1XTAL32MHz石英諧振器，組合晶振電路Y2XTAL石英諧振器，組合晶振電路UU5CC2430系統(tǒng)核心射頻芯片U2KGS20瓦斯?jié)舛葌鞲衅鱑3SHT11溫濕度傳感器UU6TPS7333Q5V→U7MAX485RS485電平信號轉(zhuǎn)換芯片J1DB9計算機接口外文資料Coal mine gas monitoring system based on wireless sensor network[Abstract】Based on the nowadays’s condition , it is urgent that the gas detection cable munication system must be replaced by the wireless munication systems. The wireless sensors distributed in the environment can achieve the intelligent gas monitoring system. Apply with multilayer data fuse to design working tactics, and import the artificial neural networks to analyze detecting result. The wireless sensors system municates with the control center through the optical fiber cable. All the gas sensor nodes distributed in coal mine are bined into an intelligent flexible structure wireless network system, forming coal mine gas monitoring system based on wireless sensor network. [Keywords】 gas；munication system；wireless sensor network；data fuse；artificial neural networks；IntroductionWith continuous enlarging of exploiting scope and extension of depth in coal mine , more and more gas is released. The number of persona1 injuries and deaths caused by the gas explosion is increasing year by year, so it is very important to control the gas accidents for achieving the safety in process of coal mine, and the development sustained and the healthy of coal industry. It is the basis of all safety process in coal mine to inspect the gas concentration, that is to say an advanced and intelligent gas inspecting network should be developed, the wireless monitoring system for coal mine environment and the information platform for disaster warning should be established, As well as setting up the Gas Monitoring System on the basis of wireless sensor network underground. 1. Model of wireless sensor network of coal mine gas monitoringAt present, the coal mine gas monitoring system is generally posed by the monitoring sensor, underground substation, information transmission system and surface centre. The junction between the underground substations with the surface centre pose of the information transmission system directly effect on the transmission quality of information and investment cost of the system, The information transmission system Can be divided into three kinds by the structure：radial, circular an tree. The tree system is widely used by most of the coal mines at present, applying with one substation to be joined with several monitoring signals, so as to reduce the system branch and as near as possible to join the system cable which es from the surface center with the underground substations at the condition of equal monitoring capacity. In the design of wireless munications, the existing optical fiber munication system can be regarded as the trunk of tree, and the respective substations under the mine are replaced by host node of wireless munication system, each host node is joined with several subnodes and together with its subnode formed a group. The gas monitoring wireless munication system in mine tunnel does a new kind of gas monitoring system, which is presented by bining the underground, exist optical