基于51矿用瓦斯检测报警器--硬件设计本科毕业设计论文

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1、摘要本科毕业设计论文题目：基于51矿用瓦斯检测报警器--硬件设计II摘要基于51矿用瓦斯检测报警器——硬件设计摘要本课题设计的是用单片机控制的甲烷浓度报警监控仪，是采用热催化原理(俗称黑白元件)探头制成的甲烷浓度测量仪，适用于中小型煤矿井、下各作业场所中测量空气中的甲烷浓度。仪器能够根据甲烷浓度报警限(1.00%)进行声、光报警，并启动排风设备，同时具有通信功能。仪器由CPU、敏感元件、看门狗监控电路、小信号放大电路、A/D转换电路、通信电路、显示电路、报警电路等组成。其中CPU是监控仪的核心，完成数据采集、处理、输出、显示等功能；敏感元件是准确检测甲烷

2、气体含量的主要元件之一，其输出是与甲烷浓度相对应的电压信号；小信号放大电路则是用来放大敏感元件输出的电压信号；A/D转换电路把放大了的电压信号由模拟信号变为数字信号送入CPU；显示电路则显示实时甲烷浓度；报警电路对超限甲烷浓度进行报警。该仪器的特点是测量范围宽，精度高；结构简单，成本低；可靠性和稳定性好，是一种电路设计新颖、参数测量准确、操作方便的矿用甲烷浓度监控仪。关键词：CPU；A/D转换电路；敏感元件；报警IIAbstractBasedOn51MineGasDetectionAlarm——HardwareDesignAbstractThistopi

3、cisdesignedMCUcontroltheconcentrationofmethanealarmmonitoringdevice,isahotcatalyticprinciple(commonlyknownasBlack-and-WhiteComponents)probeintothemethaneconcentrationmeasuringinstrument,applicabletosmallandmedium-sizedcoalmineswell,thenextintheworkplacemeasuringtheconcentrationof

4、methaneintheair.Accordingtotheconcentrationofmethaneequipmenttoalarmlimit(1.00percent),sound,lightalarm,andstartventilationequipment,communicationsfunctionatthesametime.EquipmentfromtheCPU,sensitivecomponents,thewatchdogmonitoringcircuit,small-signalamplifier,A/Dconvertercircuit,

5、communicationcircuits,displaycircuit,alarmcircuitsandothercomponents.MonitorCPUwhichisthecoreofthecompletionofdatacollection,processing,export,display,andotherfunctions;sensitivecomponentsareaccuratedetectionofmethanegasinoneofthemaincomponents,anditsoutputistheconcentrationofmet

6、hanecorrespondingtothevoltagesignal;smallsignalLargercircuitisusedtoenlargethesensoroutputvoltagesignal;A/DconvertercircuittoenlargeavoltagesignalfromanalogsignalsintodigitalsignalsintotheCPU;showcircuitshowedreal-timemethaneconcentration;alarmcircuitstogaugemethaneconcentrationa

7、larm.Theinstrumentistomeasurethecharacteristicsofawiderangeandhighprecision;structureissimple,lowcost,reliabilityandstability,isanewcircuitdesign,measurementaccurate,easytooperatetheminemethaneconcentrationmonitoringinstrument.Keywords:CPU;A/Dconvertercircuit;Sensitivecomponents;

8、AlarmII目录目录摘要（I）Abstract（II）1绪论（1）1.1本课题