电工电子单片机类毕业设计#基于AT89C51单片机有害气体检测与报警系统设计.doc

摘 要 无论是在石油、化工等企业，还是在商场或居民楼宇，一旦发生可燃或有毒气体等有害气体的泄漏而未采取有效的措施，将会对人员及财产安全产生极大地影响。对气体泄漏及早的做出检测，在泄漏未扩大之前采取有效措施，可以避免事故的发生或恶化。 本文针对有害气体在生产生活中存在的问题，设计了一种便携式的有害气体检测仪。该仪器以气体浓度传感器为检测元件，采用红外遥控技术对仪器进行标定和报警点设置，可以准确地对有害气体浓度进行实时测量。当空气中有害气体含量超过预设报警值时，采用声光方式进行报警。本课题主要进行了以下几个方面的研究： 有害气体检测与报警系统设计的背景与研究的意义，以及实际使用过程中的安装注意事项和报警器的结构。 有害气体检测仪的硬件电路设计。以微控制器AT89S51为核心搭建了系统的硬件平台，主要设计了数据采集电路、信号放大处理电路、红外遥控电路、数码显示电路、按键接口电路和声光报警电路等电路。 有害气体检测仪的固件编程，根据设计功能要求需求，采用C语言进行了有害气体检测仪软件设计，实现了有害气体浓度数据采集、处理、显示等功能。 系统调试。进行了有害气体检测仪整机调试，对实验数据进行了分析，为以后改进设计提供依据。 有害气体检测仪可以实时准确地检查企业和居民楼宇中有害气体浓度，预防重大事故发生，为工作人员和居民提供了安全保障，具有较大的推广应用价值。 关键词：有害气体、报警器、单片机、数据采集与记录、浓度测量  Abstract Coal mine methane is the main harmful gases, it is serious threat to underground operations personnel. How to check real-time accurate concentration of methane concentration reaches a certain limit, can easily cause a major safety incidents, the concentration of methane gas detector used to detect the existence of methane leaks, and thus prevent such accidents from happening. In this paper, coal mine production problems in the design of a portable methane gas concentration detector. The apparatus for the catalytic combustion type sensors for the detection of components, using infrared remote control technology to the instrument calibration and alarm set points can be accurately carried out on-site real-time measurement of methane concentration. When the methane content in the air exceeds a preset alarm value, alarm with the use of sound and light way. The main topics were the following aspects of the study. Harmful gas detection and alarm system design background and the research significance, as well as the actual use in the process of installation notes and alarm structure. Hardware circuit design of methane gas detector. Dream up the hardware platform with micro-controller as the core structres of the systems, and main design of the temperature control circuit, zero circuit, infrared remote control circuits, liquid crystal display circuit, the keyb