PAGEiiiPAGEI摘要瓦斯是煤矿生产中的有害气体,它严重地威胁着矿工生命和国家财产的安全,为了防止瓦斯爆炸事故,人们使用了多种监测方法和监测仪器,随着国家对瓦斯治理的重视,煤矿安全方面的投入在不断加大,更迫切需要一种能连续,自动检测瓦斯的仪器。鉴于传统的模拟式瓦斯报警仪精度不高且不能数字显示，本设计介绍了AT89C52单片机的性能及特点，以及以其为核心的一种低成本、高精度、微型化、数字显示的瓦斯检测仪。该瓦斯检测仪利用传统的黑白元件来实现对瓦斯的检测,将空气中的瓦斯浓度转换为电信号,再经AD转换器,将模拟信号转为数字信号,用单片机处理后根据瓦斯浓度的大小及时发出声光报警信号，或切断井下工作面的电源并向备用风机发出启动控制命令，而且可通过数字显示装置显示出瓦斯浓度，并且显示数值稳定，亮度适中。关键词：单片机瓦斯检测仪AbstractGasisharmfulintheminingactivities.Peopleusemonitorstopreventgasaccidents.Weneedautogasmonitorswhichcouldprovidecontinuousprotection.Inviewofthefactthattraditionsimulationtypegaswarningmeterprecisionarelowandcannotthedigitdemonstrate.ThispaperintroducedAT89C52monolithicintegratedcircuit'sperformanceandthecharacteristic,aswellastakeitascoreonekindoflowcost,highaccuracy,microminiaturized,digitaldemonstrationgasinstrumentation.Thisgasinstrumentationrealizesusingthetraditionalblackandwhiteparttothegasexamination,changetheconcentrationofthegasintoelectricsignals,andthenthroughtheADconvertertheanalogsignalsconverttothedigitalsignals.Afterthedealingwiththedigitalsignalsbythesinglechipcansendouttheacousto-opticsalarmpromptlyaccordingtothegasdensitysize,orthecut-offmineshaftworkingsurface'spowersourceandissuesthestartcontrolcommandtothestandbyfan,moreovermaydemonstratethegasdensitythroughthereadout,andthedemonstrationvalueisstable,brightnessismoderate.Keywords:MonolithicintegratedcircuitGasInstrumentation目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc264615071"摘要PAGEREF_Toc264615071\hiHYPERLINK\l"_Toc264615072"AbstractPAGEREF_Toc264615072\hiiHYPERLINK\l"_Toc264615073"第一章绪论PAGEREF_Toc264615073\h1HYPERLINK\l"_Toc264615074"第一节概述PAGEREF_Toc264615074\h1HYPERLINK\l"_Toc264615075"一、瓦斯检测仪的概述PAGEREF_Toc264615075\h1HYPERLINK\l"_Toc264615076"二、国内外研究现状PAGEREF_Toc264615076\h3HYPERLINK\l"_Toc264615077"第二节井下瓦斯检测仪的功能PAGEREF_Toc264615077\h5HYPERLINK\l"_Toc264615078"第二章系统电路的总体设计PAGEREF_Toc264615078\h6HYPERLINK\l"_Toc2