摘 要:煤炭是我國(guó)的主要能源，在國(guó)民經(jīng)濟(jì)中占極其重要的地位。煤礦的生產(chǎn)過(guò)程中存在很多安全問(wèn)題煤礦事故頻繁發(fā)生,其中煤礦瓦斯事故占到70%以上,因此煤礦瓦斯的監(jiān)控與治理對(duì)煤礦安全生產(chǎn)治理有極其重要的意義,從而，設(shè)計(jì)一個(gè)可靠性好、穩(wěn)定性高的煤礦瓦斯監(jiān)控系統(tǒng)，對(duì)煤礦的安全生產(chǎn)具有非常重要的作用。
本文研制的高低濃度瓦斯傳感器可以對(duì)瓦斯?jié)舛冗M(jìn)行實(shí)時(shí)檢測(cè)，并可以對(duì)傳感器進(jìn)行自動(dòng)校零、非線性補(bǔ)償。在全量程的處理上，利用MJC4/2.0與MJC4/3.0兩種載體催化元件對(duì)瓦斯氣體進(jìn)行采樣。
在傳感器硬件電路設(shè)計(jì)方面，選用AT89C51單片機(jī)作為核心處理器，設(shè)計(jì)了加熱采樣電路、信號(hào)放大電路、電源模塊、A/D轉(zhuǎn)換電路、數(shù)據(jù)存儲(chǔ)電路、紅外遙控電路、通信電路、信號(hào)輸出電路以及單片機(jī)系統(tǒng)等。
在軟件開(kāi)發(fā)方面，采用結(jié)構(gòu)化設(shè)計(jì)方法,并采用零點(diǎn)自動(dòng)補(bǔ)償程序，傳感器可以自動(dòng)調(diào)整零點(diǎn)，提高了檢測(cè)準(zhǔn)確性。
關(guān)鍵詞: 高低濃度瓦斯 傳感器 單片機(jī) A/D轉(zhuǎn)換

ABSTRACT:Coal is the primary energy in our country，It occupy the strategic position of very importance in the national economy. there are many security problems in the process of coal production，the colliery accident occurrence frequently, and the colliery accident that caused by methane gas has already above 70%.So it has momentous significance in the coal mine safety production to detect and control the methane gas. Therefore, it plays a very important role in the coal mine safety production to design a coal mine methane gas monitoring system with high-reliability and high-stability.
A high -low concentration methane transducer is developed in this paper. The methane transducer can realize real-time detection, automatic zero adjustment and non-linearity compensation. In the full measuring range detection processing, the methane transducer adopts two kinds of carrier-catalysis elements to detection the concentration of the methane.
In the side of hardware, AT89C51 microcontroller is chosen as the core processor, and the power supply circuit, signal amplification circuits, A/D conversion circuit, heating-sampling circuit, infrared remote control circuit, communication circuit, signal output circuit and SCM system are designed.
In the side of software, Using a structured design methodology，and zero automatic compensation algorithm, the methane transducer can adjust the zero point that improve the accuracy
Keywords: transducer coal mine monitoring substation

目 錄
摘 要..................................................I
Abstract..............................................II
第1章 緒論...........................................1
1.1 課題研究的目的與意義........................1
1.2 國(guó)內(nèi)外研究現(xiàn)狀與發(fā)展趨勢(shì)...................2
1.2.1 熱催化型瓦斯檢測(cè)報(bào)警儀...................3
1.2.2 熱導(dǎo)型甲烷檢測(cè)儀...........................3
1.2.3 光學(xué)甲烷檢測(cè)儀..............................3
1.2.4 紅外線式瓦斯檢測(cè)儀.........................4
第2章 瓦斯檢測(cè)的原理..............................6
2.1瓦斯檢測(cè)的原理 .................................6
2.2載體催化元件....................................8
2.3 系統(tǒng)的工作過(guò)程.................................10
第3章 系統(tǒng)硬件電路的設(shè)計(jì).........................11
3.1 系統(tǒng)的總體框圖..................................11
3.2 單片機(jī)的選擇.....................................12
3.3 信號(hào)調(diào)整放大電路的設(shè)計(jì)........................16
3.4 傳感器的選擇......................................17
3.5 A/D轉(zhuǎn)換電路的設(shè)計(jì)...............................17
3.5.1 ADC0809和單片機(jī)連接電路....................18
3.5.2 分頻器.............................................19
3.6時(shí)鐘電路與復(fù)位電路的設(shè)計(jì)........................20
3.7鍵盤(pán)顯示電路的設(shè)計(jì)................................23
3.8 聲光報(bào)警電路的設(shè)計(jì)...............................24
3.8.1 光報(bào)警電路設(shè)計(jì)..................................25
3.8.2 聲報(bào)警電路設(shè)計(jì)..................................26
3.9 存儲(chǔ)器的電路設(shè)計(jì)..................................27
3.10 紅外接收電路的設(shè)計(jì)..............................28
3.11 排風(fēng)系統(tǒng)的電路設(shè)計(jì)..............................30
3.12 通信電路的設(shè)計(jì)....................................31
3.13 電源電路的設(shè)計(jì)....................................32
第4章 程序設(shè)計(jì)...........................................36
4.1 主程序設(shè)計(jì)............................................36
4.2 ADC0809與89C51的接口程序設(shè)計(jì).................41
4.3 顯示模塊程序設(shè)計(jì)....................................44
結(jié)論 .........................................................46
致謝 .........................................................47
參考文獻(xiàn)....................................................48
附錄 .........................................................49

CONTENTS
ABSTRACT(CHINESE).........................................I
ABSTRACT......................................................II
CHAPTER 1 INTRODUCTION................................1
1.1 The purpose of the research and its significance....1
1.2 SItuation at home an abroad...........................2
1.2.1 Hot type catalytic gas detection alarmi..