空气二氧化硫检测仪(000)

摘 要

本课题是在当前环境污染的不断加重和二氧化硫检测标准越来越高的形势下提出的，旨在消除环境干扰影响，提高检测的精确性、用户操作的方便性等。

文中介绍了一种烟道气中在二氧化硫在线检测系统,该系统可以实现24 h不间断地监测烟道气中的体二氧化硫积分数和质量浓度,由LCD显示测量结果,并能够根据标准气的不同设定相应的零值和满度值。同时将信息经网络传送给环保有关部门,具有一定的新颖性、可靠性、准确性。测量范围0%--100%，不确定度为±0.1%。

关键词

二氧化硫传感器；二氧化硫气体；检测技术；大气污染

I

Abstract

Now the pollution of the SO2gas is getting worse and the standard for detecting the exhaust is becoming more rigid, so the aim of the project is to eliminating the effect of environmental interference and improving the accuracy of detection and friendly interface for user operating.

A monitoring system on line about SO2in the flue is introduced.This system can realize monitoring thevolume fraction and mass concentration in uninterrupted 24 hours. Its result can be displayed on LCD. Zero values and full values can be set according to the different standard gases.,At the same time,the informations are passedto relational environmental department by networks.It possess novelty reliability and correction.

Measurement range:0%--100%;Accuracy:±0.1%

Keywords

SO2sensor;SO2gas; analysis technology; atmosphere pollution

II

目录

摘 要 ........................................................................................................................................ I Abstract .................................................................................................................................. II

第一章 前言 ........................................................................................................................... 1

1.1 引言 .......................................................................................................................... 1 1.2 二氧化硫气体检测方法 .......................................................................................... 1 1.3 国内外二氧化硫测量技术比较分析 ...................................................................... 1 1.4 研究的内容及意义 .................................................................................................. 2 第二章 传感器概述 ............................................................................................................... 3

2.1 传感器定义及其分类 .............................................................................................. 3

2.1.1 传感器定义 .................................................................................................. 3 2.1.2 常用传感器分类 .......................................................................................... 3 2.2 传感器的发展及重要性 .......................................................................................... 3 2.3 定电位电化学二氧化硫传感器及其参数 .............................................................. 4

2.3.1 结构与工作原理 .......................................................................................... 4 2.3.2 传感器技术参数 .......................................................................................... 5

第三章 单元电路元器件介绍 ............................................................................................... 6

3.1 传感器等效电路图 .................................................................................................. 6 3.2 信号处理电路 .......................................................................................................... 6 3.3 A/D转换 ................................................................................................................... 8 3.4 单片机 .................................................................................................................... 10 3.5 LCD1602液晶显示 ................................................................................................. 13 第四章 系统总体设计 ......................................................................................................... 16

4.1 电路设计 ................................................................................................................ 16

4.1.1 系统框图 .................................................................................................... 16 4.1.2 电源电路 .................................................................................................... 16 4.1.3 系统总电路图 ............................................................................................ 17

4.2 系统工作原理及电路调试 .................................................................................... 17 4.3 结果显示 ................................................................................................................ 18 4.4 系统总体特点及功能 ............................................................................................ 19

4.4.1 特点 ............................................................................................................ 19 4.4.2 基本功能 .................................................................................................... 20

结 论 ..................................................................................................................................... 21 参考文献 ................................................................................................................................. 22 致谢 ......................................................................................................................................... 23