文档介绍：毕业设计论文
基于C51气体浓度的检测与报警的仿真设计
摘要
本课题设计的是用单片机控制的瓦斯浓度报警监控仪,是采用热催化原理探头制成的瓦斯浓度测量仪,适用于中小型煤矿井下各作业场所中测量空气中的瓦斯浓度。仪器能够根据瓦斯浓度报警限(%)进行声、光报警。仪器由CPU、敏感元件、A/D转换电路、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瓦斯气体含量的主要元件之一,其输出是与瓦斯浓度相对应的电压信号;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瓦斯浓度;报警电路对超限瓦斯浓度进行报警。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、操作方便的矿用瓦斯浓度监控仪。
关键词:CPU;A/D转换电路;敏感元件;报警
Abstract
This paper designs gas alarm monitor, which is according to catalytic principle. It is applicable to small and medium-sized coal mine in the measurement of workplace air concentration of gas. Apparatus, which is according to gas concentration alarm limit (1%), carry out sound and light alarm. Apparatus consists of CPU, sensitive element, A/D conversion circuit, display circuit and alarm circuit. CPU, which is the core of the monitor, finishes data’s acquisition, processing, output, display and other functions; sensitive element that is used of the accurate detection of gas content is one of the ponents, and its output is the voltage signal which is corresponding to the gas-concentration; A/D conversion circuit exports the amplified voltage signal from the analog signal into digital signal to the CPU; display circuit displays the real-time gas-concentration; the alarm circuit alarms to the limited gas-concentration. The apparatus is characterized by a wide measurement range, high precision, reliability and good stability. It is that parameter measurement is accurate, the mine gas-concentration monitor.
Key words: CPU; A/D converter circuit; ponents; Alarm
目录
前言 1
1 绪论 2
本课题的研究背景及意义 2
国内外发展概况及研究方向 3
2 系统概述 4
系统框图 4
工作原理 5
3 报警器设计 6
6
6
热催化元件的结构及工作原理 7
A/D转换电路 14
ADC0809的介绍 14
14
16
单片机的概述 16
16
18
AT89C51简介 19
20
21
AT89C51单片机对ADC0809的接口 24
声光报警与LED显示 25
25
LED显示 26
4 系统仿真及部分程序 2