氣體檢測(cè)系統(tǒng)中英文對(duì)照外文翻譯文獻(xiàn)

中英文對(duì)照外文翻譯文獻(xiàn)中英文對(duì)照翻譯研究智能氣體檢測(cè)系統(tǒng)文摘根據(jù)統(tǒng)計(jì)數(shù)據(jù)，中國(guó)近年來(lái)，煤氣泄漏時(shí)有發(fā)生，對(duì)人身安全造成很大威脅，因此氣體檢測(cè)和監(jiān)控系統(tǒng)是需要作為一個(gè)安全裝置在家庭應(yīng)用。在本文中，智能氣體檢測(cè)系統(tǒng)的設(shè)計(jì)。該檢測(cè)儀采用單片機(jī)AT89S52為控制核心，采用催化燃燒式氣體傳感器元件MC112作為氣體傳感器（CH4）檢測(cè)。該系統(tǒng)的主要功能如下：濃度的實(shí)時(shí)監(jiān)測(cè)CH4和顯示的濃度值；發(fā)射聲光報(bào)警信號(hào)，如果CH4濃度值超過(guò)報(bào)警值通過(guò)鍵盤面板輸入；串行通信口發(fā)送數(shù)據(jù)地面以上主機(jī)。軟件調(diào)試和硬件仿真上述系統(tǒng)也實(shí)現(xiàn)在同一時(shí)間。關(guān)鍵詞：數(shù)據(jù)采集，傳感器,串行通信,單片機(jī)。在本文中，檢測(cè)系統(tǒng)采用單片機(jī)作為控制計(jì)算機(jī)；整個(gè)系統(tǒng)的示意圖如圖1所示。選擇理由：?jiǎn)纹瑱C(jī)作為控制核心，它具有體積小尺寸，高可靠性，低價(jià)格，使其成為行業(yè)使用非常合適智能儀表、實(shí)時(shí)控制領(lǐng)域。系統(tǒng)的操作界面如圖2所示。在右上角號(hào)碼顯示默認(rèn)的或用戶定義的氣體濃度值，在左上角顯示檢測(cè)到的氣體濃度值。報(bào)警燈的設(shè)置。所有的功能通過(guò)設(shè)置控制面板上的按鍵控制，包括電源鍵，復(fù)位鍵，數(shù)據(jù)采集的關(guān)鍵。其他鍵包括十個(gè)數(shù)字鍵，調(diào)整值鍵和回車鍵來(lái)改變閾值?；静僮鞒绦蛉缦拢菏紫劝聪码娫存I，系統(tǒng)初始化機(jī)數(shù)據(jù)采集的關(guān)鍵，LED在右上角顯示的閾值1；用戶可以定制閾值調(diào)整值的按鍵和數(shù)字鍵，然后按回車鍵確認(rèn)更改。系統(tǒng)開(kāi)始檢測(cè)氣體濃度和上顯示這些參左葉面積，同時(shí)實(shí)時(shí)數(shù)據(jù)的傳輸，通過(guò)RS-485總線主機(jī)地面上的。3氣體檢測(cè)系統(tǒng)的硬件系統(tǒng)設(shè)計(jì)主要包括主控單元系統(tǒng)的硬件結(jié)構(gòu)，傳感器和信號(hào)放大電路，A/D轉(zhuǎn)換模塊，聲光報(bào)警電路，鍵盤顯示模塊，串口通信模塊。3.1主控單元具有集成度高,體積小,價(jià)格低，單片機(jī)已廣泛應(yīng)用于工業(yè)過(guò)程中廣泛應(yīng)用包括控制，數(shù)據(jù)采集，機(jī)電一體化，智能儀表，家用電器和網(wǎng)絡(luò)技術(shù)，以及顯著提高的程度技術(shù)和自動(dòng)化?？紤]在芯片選擇兩個(gè)因素，一是抗干擾的能力，提高單片機(jī)應(yīng)用系統(tǒng)的干擾，圖2.系統(tǒng)運(yùn)行界面圖所以單片機(jī)必須有較高的外界干擾；二是單片機(jī)的性能價(jià)格比。考慮到上述因素，我們采用了Atmel公司的AT89S52作為主控單元，和主控電路的最終方案包括AT89S52單片機(jī)，定時(shí)器和復(fù)位電路[8,9]。如圖3所示。圖3.主控制單元3.2傳感器和信號(hào)放大電路3.2.1傳感器的選擇在氣體檢測(cè)系統(tǒng)設(shè)計(jì)的一個(gè)關(guān)鍵問(wèn)題是如何選擇的氣體傳感器。常見(jiàn)的氣體傳感器的半導(dǎo)體金屬氧化物如氧化錫，鋅coxide，鈦氧化物和鋁氧化物。遇到的問(wèn)題與這些傳感器缺乏靈活性，可憐響應(yīng)時(shí)間和在升高的溫度下操作[10]。甲烷檢測(cè)新方法基于紅外技術(shù)是近年來(lái)提出的，但它仍然是在進(jìn)步和很多工作之前應(yīng)該可以應(yīng)用于解決實(shí)際工程問(wèn)題[11]。本系統(tǒng)采用催化燃燒式氣敏元件MC112開(kāi)發(fā)海星集團(tuán)來(lái)測(cè)量氣體（CH4）的濃度。圖4顯示了外面觀和MC112內(nèi)部電路，表1列出了主要技術(shù)參數(shù)MC112。MC112氣體檢測(cè)器利用催化燃燒原理的兩個(gè)臂；橋是由測(cè)量與補(bǔ)償元件對(duì)。當(dāng)它被暴露可燃?xì)怏w，測(cè)量元件電阻增大，輸出通過(guò)測(cè)量電橋電壓參數(shù)，參數(shù)的電壓成正比的氣體濃度值。補(bǔ)償元件的工作溫度補(bǔ)償和參考。對(duì)MC112主要功能包括可重復(fù)性好，工作穩(wěn)定，可靠，線性輸出電壓，和快速的反應(yīng)。煤礦安全規(guī)程表示，如果甲烷氣體濃度超過(guò)1%，安全系統(tǒng)應(yīng)警報(bào)，如果瓦斯?jié)舛瘸^(guò)2%，所有的人都必須立刻疏散。自檢測(cè)低濃度甲烷MC112范圍為0%-2%。圖4.外觀3.2.2信號(hào)放大電路要放大微弱電信號(hào)的檢測(cè)采用MC112（1%氣體濃度波動(dòng)將導(dǎo)致16MV電壓變化）。采用扭矩傳感器系統(tǒng)廣告公司開(kāi)發(fā)的高性能的儀表放大器。它有優(yōu)點(diǎn)：（1）單電源和12V輸出（2）易于修改信號(hào)增益雖然外部電阻器，它將作為無(wú)外部單位增益電阻和信號(hào)增益可達(dá)1000與一個(gè)外部電阻；（3）低功耗消耗，大規(guī)模的操作電壓，線性度好，熱穩(wěn)定性好，高可靠性。信號(hào)放大器電路原理圖如圖5所示。圖5.信號(hào)放大電路3.3的A/D轉(zhuǎn)換器模塊如圖6所示，該模塊由多路CD4051，采樣保持器lf389，A/D轉(zhuǎn)換器AD574A[12]和并行I/O芯片8255A作為核心的一部分，AD574A是一個(gè)12位的逐次逼近A/D轉(zhuǎn)換器芯片三的狀態(tài)緩沖區(qū)，其轉(zhuǎn)換時(shí)間約為25μS.AD574A能夠直接連接到單片沒(méi)有額外的接口邏輯電路，內(nèi)置高精度的參考功率電源和時(shí)鐘電路，無(wú)需外部時(shí)鐘源AD574A能夠正常運(yùn)行參考電源。圖6.A/D轉(zhuǎn)換器模塊3.4其他模塊3.4.1數(shù)字顯示模塊傳統(tǒng)的液晶顯示模塊是不適合在這個(gè)系統(tǒng)中由于工作環(huán)境主要是在黑暗的礦井隧道深。LED軟燈應(yīng)選擇。它是在煤礦的特點(diǎn)為不利的情況下適用防潮，卓越的溫度特性和長(zhǎng)距離的視覺(jué)效果。在本系統(tǒng)，采用6位LED動(dòng)態(tài)顯示CH4氣體濃度值，與段端口和位端口與PA口和PB端口連接8155（1）分別。3.4.2鍵盤輸入模塊在鍵盤輸入模塊，我們安排了13個(gè)鍵，包括10個(gè)數(shù)字鍵和“數(shù)據(jù)收集”鍵，“進(jìn)入”鍵，“復(fù)位”鍵。采用相反的方向連接的方法，PB口和8155PC端口（2）連接到鍵盤的行和列電路電路分別。3.4.3串行通信和聲光報(bào)警單元串行通信模塊，信號(hào)控制器發(fā)送到主機(jī)計(jì)算機(jī)上通過(guò)RS-485，和MAX485是用于轉(zhuǎn)換電壓。RS-485是多點(diǎn)雙向半雙工通信基于單平衡線電路具有高噪聲抑制鏈接，傳輸速率高，傳輸距離長(zhǎng)、寬共模范圍，其最大傳輸率達(dá)到10Mbps，電纜的最大距離達(dá)到1200[13,14]。P21和P10AT89S52將聲光報(bào)警單元控制時(shí)甲烷氣體濃度的檢測(cè)值超過(guò)設(shè)定值。4控制系統(tǒng)軟件設(shè)計(jì)軟件控制系統(tǒng)包括系統(tǒng)初始化的主要功能，閾值設(shè)定，甲烷氣體濃度數(shù)據(jù)采集和顯示，串行通信等。為了實(shí)現(xiàn)上述功能，我們開(kāi)發(fā)了串行程序采用51系列單片機(jī)匯編程序語(yǔ)言包括主程序，鍵盤掃描程序，A/D轉(zhuǎn)換程序，報(bào)警程序，串口通訊程序，數(shù)據(jù)顯示程序，系統(tǒng)報(bào)警診斷程序，雙字節(jié)乘法程序，三字節(jié)二進(jìn)制程序看狗程序。該系統(tǒng)是由許多模塊，由于有限的空間，我們介紹主程序。主程序初始化單片機(jī)寄存器，I/O端口，然后掃描鍵盤看數(shù)據(jù)采集鍵被按下，如果沒(méi)有，繼續(xù)掃描鍵盤按鍵直到數(shù)據(jù)收集。當(dāng)收集鍵被按下，默認(rèn)的閾值1顯示面板上，如果用戶想復(fù)位閾值價(jià)值，只是按調(diào)整值設(shè)置一個(gè)新值，然后按回車鍵完成這一步。當(dāng)按下Enter鍵，系統(tǒng)開(kāi)始數(shù)據(jù)采集的運(yùn)行和A/D轉(zhuǎn)換，然后將轉(zhuǎn)換后的數(shù)據(jù)為二進(jìn)制格式調(diào)用一個(gè)子程序的雙字節(jié)乘法。我們需要三個(gè)存儲(chǔ)單元存儲(chǔ)這些數(shù)據(jù)是因?yàn)樗麄?4位二進(jìn)制數(shù)據(jù)格式。接下來(lái)，系統(tǒng)會(huì)將這些二進(jìn)制格式的數(shù)據(jù)轉(zhuǎn)換成二進(jìn)制編碼的十進(jìn)制格式，通過(guò)調(diào)用一個(gè)子程序三字節(jié)的二進(jìn)制編碼的十進(jìn)制。在最后一步中，值與預(yù)先設(shè)定的比較決定是否應(yīng)發(fā)出報(bào)警信號(hào)的閾值。在這期間，這些數(shù)據(jù)將被發(fā)送到上位機(jī)通過(guò)RS-485串行地通信單元。然而，系統(tǒng)會(huì)發(fā)送一個(gè)正脈沖復(fù)位看門狗定時(shí)器每1.6秒。本系統(tǒng)采用單片機(jī)的晶振頻率為12MHz，與定時(shí)器/計(jì)數(shù)器，模式1的工作（16位定時(shí)器/計(jì)數(shù)器），其最大時(shí)間間隔約為66ms，所以系統(tǒng)會(huì)發(fā)送一個(gè)信號(hào)到喂狗看門狗電路各66ms。5個(gè)結(jié)論在這項(xiàng)研究中，一個(gè)智能氣體檢測(cè)系統(tǒng)。它可以用于實(shí)時(shí)甲烷氣體濃度監(jiān)測(cè)。測(cè)量從零到百分之2本系統(tǒng)的范圍內(nèi)，傳感器的靈敏度達(dá)到百分之0.01。它具有速度快、高性能的12位A/D轉(zhuǎn)換器，工作環(huán)境溫度范圍從20℃～+70℃。這仍然系統(tǒng)具有可靠性高，操作方便，性能價(jià)格比高。在本文中，總規(guī)劃軟件和氣體檢測(cè)系統(tǒng)的硬件設(shè)計(jì)提出了利用Proteus，測(cè)試硬件電路，采用KEIL測(cè)試組裝語(yǔ)言源程序，仿真試驗(yàn)結(jié)果表明該系統(tǒng)具有較高的精度，快速響應(yīng)是可行的。工具書(shū)類1．李，永航：對(duì)經(jīng)濟(jì)增長(zhǎng)和煤炭消費(fèi)的關(guān)系分析。經(jīng)濟(jì)論壇報(bào)458，52，53（2009）–2．羅，Z.：中國(guó)西部煤炭資源的優(yōu)化利用。中國(guó)礦業(yè)雜志10（1），39（2001）36–3．玉，高爐：煤礦瓦斯災(zāi)害防治及利用手冊(cè)。中國(guó)煤工業(yè)出版社（2005）4．周，J.M.：1.25特大瓦斯爆炸在耿村煤礦的原因和預(yù)防措施。煤礦安全32（3），33（2001）32–5．王，K.，浩，N.：煤礦安全綜合預(yù)警系統(tǒng)的構(gòu)想。煤礦安全39（11），105（2008）103–6．燕，英國(guó)，張，L.：便攜式甲烷檢測(cè)報(bào)警儀的設(shè)計(jì)。報(bào)警。煤礦安全煤礦39（9），33（2008）32–7．玉，y.q.：?jiǎn)纹瑱C(jī)控制系統(tǒng)中的應(yīng)用。出版電子工業(yè)出版社（2003）8．太陽(yáng)，以春，等。：新型AT89S52系列單片機(jī)及其應(yīng)用。清華大學(xué)出版社（2004）9．王，信摯科技發(fā)展：的AT89系列單片機(jī)原理與接口技術(shù)理論。北京航空航天大學(xué)出版社（2004）10．faizah，我：室溫多氣體檢測(cè)使用碳納米管。歐洲科學(xué)研究35（1），149（2009）142–11．李，W.J.，胡，Y.，李，等：基于紅外技術(shù)的甲烷檢測(cè)系統(tǒng)。安全在煤礦39（11），66（2008）63–外文原文ResearchofIntelligentGasDetectingSystemAbstract.AccordingtostatisticdataofChinainrecentyears,Gasleakageoccurs,Poseagreatthreattothepersonalsafety.SothegasdetectionAndmonitoringsystemisrequiredasasafetydeviceappliedinthefamily.Inthispaper,anintelligentgasdetectingsystemisdesigned.ThisdetectioninstrumentadoptsSCMAT89S52asitscontrolhardcoreandusescatalyticcombustiontypegassensorelementMC112asthesensorforgas(CH4)detecting.Themainfunctionsofthissystemareasfollows:monitoringthereal-timeconcentrationofCH4anddisplayingtheconcentrationvalue;emittingsoundandlightalarmsignalsiftheCH4concentrationvalueisbeyondthealarmvalueinputtedbykeyboardpanel;usingserialcommunicationporttotransmitdatatothehostcomputeraboveground.Thesoftwaredebuggingandhardwaresimulatingofthesystemabovearealsoimplementedatthesametime.Keywords:Datacollection,Sensor,Serialcommunication,SCM.detectingsysteminthispaperadoptssingle-chipmicrocomputerascontrolcomputer;theoverallschematicdiagramofsystemisshowninFigure1.Thereasonforselectingsingle-chipmicrocomputerasacontrolcoreisthatitpossessesadvantagesofsmallsize,highreliability,lowpricewhichmadeitverysuitabletobeusedinindustriesofintelligentinstrumentandrealtimecontrol.TheoperatinginterfaceofsystemisshowninFigure2.Numberatupperrightcornershowsthedefaultoruser-definedgasconcentrationvalue,numberatupperleftcornershowsdetectedgasconcentrationvalue.Onealarmlampisequipped.Allfunctionsarecontrolledbykeysarrangedonthecontrolpanel,includingPOWERkey,RESETkey,DATACOLLECTIONkey.Otherkeysincludingtennumberkeys,ADJUSTVALUEkeyandENTERkeyareusedtochangethresholdvalues.Basicoperatingproceduresareasfollows:FirstlypressPOWERkey,thesysteminitialized.PressDATACOLLECTIONkey,LEDatupperrightcornerdisplaysthethresholdvalue1.00;UsercancustomizedthresholdvaluebypressADJUSTVALUEkeyandtennumberkeys,thenpressENTERtoconfirmthechange.SystemstartstodetectgasconcentrationanddisplaytheseparametersonupperleftLEDarea,atmeantimetransmitreal-timedatabyRS-485tohostcomputeraboveground.3HardwareSystemDesignofGasDetectionSystemTheHardwarearchitectureofsystemmainlyincludingmaincontrolunit,sensorsandsignalamplifiercircuit,A/Dconvertermodule,sound-lightalarmingcircuit,keyboardanddisplaymodule,serial-communicationmodule.3.1MainControlUnitFeaturedbyhighintegrationlevel,smallsizeandlowprices,Singlechipmicrocomputerhasbeenwidelyusedinabroadrangeofindustrialapplicationsincludingprocesscontrolling,datacollection,electromechanicalintegration,intelligentinstrument,householdappliancesandnetworktechnology,andsignificantlyimprovedthedegreeoftechnologyandautomation.Twofactorsaretakenintoaccounthereinchipselecting,firstoneisanti-interferenceability,increasetheinterferencesinSCMapplicationsystems,sotheSCMmusthavehighresistancetooutsideinterference;secondoneistheperformance-priceratiooftheSCM.Consideringtheaforementionedfactors,weadoptedtheAT89S52developedbyATMELasmaincontrolunit,andthefinalschemeofmaincontrolcircuitconsistsofAT89S52,timerandresetcircuit[8,9].Asshowninfigure3.3.2.1SensorSelectionAcrucialissueingasdetectingsystemdesignishowtoselectgassensors.Commongassensorsaremetaloxidesemiconductorsuchastinoxide,zincoxide,titaniumoxideandaluminumoxide.Problemsencounteredwiththesesensorsarelackofflexibility,poorresponsetimesandoperatedatelevatedtemperature[10].Anewmethodofch4detectingbasedoninfraredtechniqueswaspresentedinrecentyears,butitisstillinprogressandmuchworkshouldbedonebeforeitcanbeappliedtosolvethepracticeproblems[11].ThissystemadoptedcatalyticcombustiontypegassensorMC112developedbySUNSTARgrouptomeasurethegas(ch4)concentration.Figure4showstheoutsideviewandinternalcircuitofMC112,table1liststhemaintechnologyparametersofMC112.MC112gasdetectorexploitscatalyticcombustionprinciple;thetwo-armbridgeiscomprisedofmeasureandcompensatecomponentspairs.Whenitisexposedtocombustiblegases,measurecomponentsresistanceRSincreasedandtransmitoutputvoltageparameterthroughmeasuringbridge,thevoltageparameterisdirectlyproportionaltothegasconcentrationvalue.Thecompensatecomponentworksastemperaturecompensationandreference.MainfeaturesofMC112includegoodrepeatability,workstably,reliability,linearoutputvoltage,andquickresponse.Theminesafetyrulesstatedthatifmethanegasconcentrationexceeds1%,safetysystemshouldmakeanalert,ifgasconcentrationexceeds2%,allpeoplemustevacuateimmediately.SincethedetectingrangeofMC112forlowconcentrationmethaneis0%-2%.Fig.4.Outsideview3.2.2SignalAmplifierCircuitItisnecessarytoamplifytheweakelectricalsignaldetectedbyMC112(1%gasconcentrationfluctuationwillresultin16mvvoltagechange).ThesystemadoptedAD623developedbyADCompanyasthehighperformanceinstrumentationamplifier.Ithasmanymerits:(1)outputwith3-12vsinglesupply(2)easytomodifysignalgainthoughanexternalresistor,itwillbeactasaunitgainwithoutexternalresistorandsignalgaincanreachto1000withanexternalresistor;(3)lowpowerconsumption,large-scaleoperationvoltage,goodlinearity,goodthermalstabilityandhighreliability.Theschematicdiagramofsignalamplifiercircuitisshowninfigure5.3.3A/DConverterModuleAsshowninFigure6,thismoduleconsistsofmultiplexerCD4051,samplingholderLF389,A/DconverterAD574A[12]andparallelI/Ochip8255A.Asacorepart,AD574Aisa12-bitsuccessive-approximationA/Dconverterchipwiththree-statebuffer,itsconversiontimeisabout25μs.AD574AcandirectlyconnectedtoAT89S52withoutadditionalinterfacelogiccircuit,withinternalhighaccuracyreferencepowersupplyandclockcircuit,AD574Acanoperatenormallywithoutexternalclocksourceandreferencepowersupply.3.4OtherModules3.4.1DigitalDisplayModuleTraditionalLCDmoduleisunsuitableinthissystembecausetheworkingenvironmentmainlyliesdeepindarkcoalminetunnel.LEDwithsoftlightshouldbethealternative.Itissuitablefortheadversecircumstancesundercoalminefeaturesbydamp-proof,excellencetemperaturecharacteristicsandlongdistancevisualeffects.Inthissystem,a6-bitLEDisadoptedtodynamicallydisplaythech4gasconcentrationvalue,withthesegmentportandbitportconnectedwithPAportandPBportof8155(1)separately.3.4.2KeyboardInputModuleInkeyboardinputmodule,wearranged13keysincluding10numberkeysand“Datacollection”key,“Enter”key,“reset”key.Adoptedoppositedirectionconnectmethod,PBportandPCportof8155(2)connectedtokeyboard’srowcircuitandcolumncircuitrespectively.3.4.3SerialCommunicationsandSound-LightAlarmingUnitsTheserialcommunicationsmoduleisshownattheleftpartinFigure9,signalofmicrocontrolleristransmittedtohostcomputerabovegroundbyRS-485,andMAX485isusedtoconvertthevoltage.RS-485isamulti-pointtwo-wayhalf-duplexcommunicationlinkbasedonsinglebalanced-wirecircuitfeaturedbyhighnoisesuppression,hightransferrate,longdistancetransmissionandWidecommon-moderange,itsmaximumtransferratereachesto10Mbps,maximumcabledistancereachesto1200m[13,14].P21andP10ofAT89S52willtakecontrolofsound-lightalarmingunitwhenthetestvalueofCH4gasconcentrationexceedsthepresetvalue.4SoftwareDesignofControlSystemTheprimaryfunctionsofthesoftwarecontrolsystemincludingsysteminitializing,thresholdvaluesetting,methanegasconcentrationdatacollectinganddisplaying,serialcommunicationsetc.Toachievetheabovefunctions,wedevelopedserialprogramsusing51serialsmicrocontrollerassembleprogramlanguageincludingmainprogram,keyboardscanningprogram,A/Dconverterprogram,alarmingprogram,serialcommunicationsprogram,datadisplayprogram,systemalarmingdiagnosisprogram,double-bytemultiplyprogram,triple-bytetobinary-coded-decimalprogramandwatchingdogprogram.Thesystemiscomprisedofmanymodules,Owingtolimitedspaceweintroducemainprogramonly.mainprograminitializingsinglechipmicrocomputer’sregistersandI/Oports,thenscanningkeyboardtoseeifthedatacollectionkeyispressed,ifno,keepscanningkeyboarduntildatacollectionkeyispressed.Whenthecollectionkeyispresseddown,defaultthresholdvalue1.00isshownonthepanel,ifuserwantstoresetthresholdvalue,justpresstheADJUSTVALUEkeytosetanewvalue,andpressENTERkeytofinishthisstep.WhenENTERkeyispressed,systemstarttheoperatingofdatacollectionandA/Dconversion,thentransmittheconverteddataintobinaryformatbycallingasubprogramofdouble-bytemultiply.Weneedthreestorageunitstoholdthesedatabecausetheyare24bitsdatainbinaryformat.Next,systemwilltransmitthesebinaryformatdataintobinary-coded-decimalformatbycallingasubprogramoftriple-bytetobinary-coded-decimal.Inthelaststep,comparingthevaluewithpre-setthresholdvaluetodecideifthesystemshouldsendanalarmsignal.Inthemeantime,thesedatawillbesendingtohostcomputerabovegroundthroughRS-485serialcommunicationsunit.Still,thesystemwillsendapositivepulsetoresetthewatchdogtimerevery1.6sec.theCrystalOscillatorfrequencyoftheSCMadoptedinthissystemis12MHZ,withtimer/counterTO,workinginmode1(16bittimer/counter),itsmaximaltimingintervalisabout66ms,sothesystemwillsendafeedingdogsignaltowatchdogcircuitevery66ms.5ConclusionsInthisstudy,anintelligentgasdetectingsystemispresented.Itcanbeusedtoreal-timemonitoringthemethanegasconcentration.Themeasuringscopeofthissystemrangefromzeroto2percent,thesensitivityofthesensorreachto0.01percent.Itisequippedwiththequickspeedandhighperformance12-bitA/Dconverter,theoperatingenvironmenttemperaturerangedfrom-20℃～+70℃.Stillthissystemfeatureswithhighreliability,easytooperate,highperformance-priceratio.Inthispaper,thetotalplanandsoftwareandhardwaredesignofagasdetectingsystemarepresented,byusingProteustotesth