文档介绍：本科毕业设计论文
题目:基于51矿用瓦斯检测报警器
--硬件设计
提示:(与“基于51矿用瓦斯检测报警器
—硬件设计”配套,也在百度文库里)
基于51矿用瓦斯检测报警器
——硬件设计
摘要
本课题设计的是用单片机控制的甲烷浓度报警监控仪,是采用热催化原理(俗称黑白元件)探头制成的甲烷浓度测量仪,适用于中小型煤矿井、下各作业场所中测量空气中的甲烷浓度。仪器能够根据甲烷浓度报警限(%)进行声、光报警,并启动排风设备,同时具有通信功能。仪器由CPU、敏感元件、看门狗监控电路、小信号放大电路、A/D转换电路、通信电路、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甲烷气体含量的主要元件之一,其输出是与甲烷浓度相对应的电压信号;小信号放大电路则是用来放大敏感元件输出的电压信号;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甲烷浓度;报警电路对超限甲烷浓度进行报警。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、操作方便的矿用甲烷浓度监控仪。
关键词:CPU;A/D转换电路;敏感元件;报警
Based On 51 Mine Gas Detection Alarm
——Hardware Design
Abstract
This topic is designed MCU control the concentration of methane alarm monitoring device, is a hot catalytic principle (commonly known as Black-and-ponents) probe into the methane concentration measuring instrument, applicable to small and medium-sized coal mines well, the next in the workplace measuring the concentration of methane in the air. According to the concentration of methane equipment to alarm limit ( percent), sound, light alarm, and start ventilation equipment, communications function at the same time. Equipment from the CPU, ponents, the watchdog monitoring circuit, small-signal amplifier, A/D converter circuit, communication circuits, display circuit, alarm circuits and ponents. Monitor CPU which is the core of pletion of data collection, processing, export, display, and other functions; ponents are accurate detection of methane gas in one of the ponents, and its output is the concentration of methane corresponding to the voltage signal; small signal Larger circuit is used to enlarge the sensor output voltage signal; A/D converter circuit to enlarge a voltage signal from analog signals into digital signals into the CPU; show circuit showed real-time methane concentration; alarm circuits to gauge methane concentration alarm. The instrument is to measure the characteristics of a wide range and high precision; structure is simple, low cost, reliability and