有毒可燃气体报警器原理及设计

本文设计了一种对环境中CO浓度进行实时数据采集和处理，并能在浓度超标时报警的电路。该电路通过单片机实现其控制功能。整个报警器电路由四大部分组成：采集模块、放大模块、模数转换模块、单片机。报警器的主要工作流程为：用两类传感器（气体传感器和温度传感器）将所需的模拟信号采集放大后传送给A／D转换器，再经模数转换后将数字信号传送至8051单片机。然后通过单片机内部的数据处理，判断是否需要启动蜂鸣器进行报警。该报警器能广泛应用于居民家庭和企事业单位，从而大大降低由CO所引起的中毒、火灾、爆炸等事故的发生率，保障了人们的生命和财产安全，具有重要的实用价值。

The Design of Alarm for Measuring Noxious Gases

In this dissertation, an electric circuit is designed to collect and process the data of CO density, and the alarm is sent out when the density beyond the critical value. The control function of the electric circuit is accomplished by a microcontroller. The whole electric circuit of alarm is composed by four parts: data acquisition module, data enlarge module, A/D module, and microcontroller. The technological process of the alarm is as follows: The analogue signals are collected by two kinds of transducers, and then the signals are transmitted to the ADC after enlargement. The data signals are transmitted by ADC to the 8051 microcontroller. The judgment of the buzzer alarm is made after the data processed by 8051. Main work in this dissertation is: completing the choice of the machines, the design of the connection and the development of the procedure for data processing; realizing the automatically monitor CO density. The annunciator can be widely used in families and companies. The occurrence rates of the accidents such as poisoning, fire, burst, etc are deeply reduced. It has an important and practical value.