CO氣體檢測(cè)儀設(shè)計(jì)

電氣自動(dòng)化論文編號(hào):ZD824    論文字?jǐn)?shù):23048,頁數(shù):58

目 錄
摘 要………………………… ………………………………………………………………………Ⅰ
Abstract…………………………………………………………………………………………… Ⅱ
1.緒 論……………………………………………………………………………………………… 1
1. 1一氧化碳?xì)怏w檢測(cè)儀表概述 2
1．2 氣體檢測(cè)儀表的國(guó)內(nèi)外發(fā)展?fàn)顩r 3
1. 3 一氧化碳?xì)怏w檢測(cè)儀表的現(xiàn)實(shí)意義 4
1．4 本課題的主要工作 5
2．系統(tǒng)設(shè)計(jì)…………………………………………………………………………………………5
2．1 系統(tǒng)總體結(jié)構(gòu) 5
2．2 系統(tǒng)硬件設(shè)計(jì) 6
2．3  系統(tǒng)軟件設(shè)計(jì) 21
3串行通訊協(xié)議…………………………… …………………………………………………… 29
4 系統(tǒng)低功耗設(shè)計(jì)………………………………………………………………………………30
總 結(jié)……………………………………………………………………… …………………………31
致 謝……………………………………………………………………………… …………………32
參考文獻(xiàn) ……………………………………………………………………………………………33
附錄……………………………………………………………………………………………………35

摘 要
 一氧化碳為無色、無味、有劇毒的氣體。在煤礦中 ,由于煤在低溫氧化階段產(chǎn)生一氧化碳，因此 ,一氧化碳是早期揭露火災(zāi)的敏感指標(biāo)。在礦井的采煤工作面回風(fēng)道、綜掘煤巷等有自燃發(fā)火的地點(diǎn)設(shè)置一氧化碳檢測(cè)儀 ,可對(duì)煤層自燃進(jìn)行預(yù)測(cè)預(yù)報(bào)。及時(shí)準(zhǔn)確地測(cè)定礦井氣體中的一氧化碳濃度 ,對(duì)人體健康和安全生產(chǎn)都有著重要的意義。
 一氧化碳?xì)怏w檢測(cè)的方式有很多 ,目前應(yīng)用得較為廣泛的是熱催化檢測(cè)方式。但由于多種可燃性氣體都能催化氧化燃燒 ,導(dǎo)致檢測(cè)精度下降。另外，采用這種方式的檢測(cè)儀體積和功耗都較大 ,不便于隨身攜帶。本課題設(shè)計(jì)的單片機(jī)MSP430控制的便攜式一氧化碳檢測(cè)儀將空氣中的一氧化碳濃度轉(zhuǎn)換為電信號(hào),再經(jīng)AD轉(zhuǎn)換器,將模擬信號(hào)轉(zhuǎn)為數(shù)字信號(hào),用微處理器處理后,用4位七段LED數(shù)碼管顯示濃度數(shù)值。當(dāng)空氣中一氧化碳濃度超限后有聲光報(bào)警功能。本課題設(shè)計(jì)的單片機(jī)控制的便攜式一氧化碳檢測(cè)儀有電源監(jiān)控功能,實(shí)時(shí)監(jiān)控儀表內(nèi)部電源,當(dāng)電源電壓低于閾值時(shí)發(fā)出報(bào)警,提醒使用人員及時(shí)更換電池,并且外部有復(fù)位按鈕,可是系統(tǒng)安全可靠。本課題所設(shè)計(jì)的一氧化碳檢測(cè)儀,針對(duì)便攜的特點(diǎn),內(nèi)部芯片全采用貼片式封裝,體積小,功耗低,測(cè)值報(bào)警準(zhǔn)確,便于工作人員的攜帶,特別是在礦井下流動(dòng)的工作人員隨身攜帶。

關(guān)鍵字： MSP430、報(bào)警、低功耗

Abstract
 Carbon monoxide is a colorless, tasteless, highly toxic gas. In the coal mine, since the coal produced in low-temperature oxidation stage of carbon monoxide, carbon monoxide is early to expose the fire-sensitive indicators. Mine in the coal face to the wind Road, fully mechanized coal entry, such as digging a spontaneous combustion of carbon monoxide detector locations, the spontaneous combustion of coal a prediction. Timely and accurate determination of carbon monoxide in the mine gas concentration on human health and production safety have is of important significance.
 Carbon monoxide gas detection means a lot, in the wider application of the thermal catalytic detection method. However, due to a variety of flammable gas can be catalyzed oxidation combustion, resulting in decreased accuracy of detection. In addition, the use of this type of detector are larger in size and power, not easy to carry. The subject of design MSP430 MCU control of the portable carbon monoxide detector will be the concentration of carbon monoxide in the air and converted to electrical signals, then the AD converter, the analog signal to digital signals, processed by the microprocessor, with 4  LED digital display of the concentration of value. When the concentration of carbon monoxide in the air after a sound and light gauge alarm function. The issue of the SCM control of the design of portable carbon monoxide detector with power monitoring function, real-time monitoring instrument within the power, when the supply voltage below the threshold when the alarm to remind the use of staff time to replace batteries, and there are external reset button, but system Safe and reliable. This issue designed by carbon monoxide detector, portable against the characteristics of the internal use of the entire chip-chip package, small size, low power consumption, accurate measurement of the police, to facilitate the carrying of staff, particularly in the flow of underground mine Staff carry.

Keyword: MSP430, alarm, Low-Power