文档介绍：摘要
矿井中瓦斯浓度的监测,直接关系到煤矿的安全生产和广大的矿工的生命安全。而单片机传感器近年来发展的相当快,其本身具有速度快、精度高、操作简便、运行可靠等特点,十分适合作为瓦斯监控传感器的核心。根据国家煤矿安全生产规范的要求,本文设计了一种使用PIC16F877单片机的智能矿井瓦斯传感器,除具有浓度显示,声光报警等传统功能外,还具有上位机监控的功能,能将瓦斯浓度通过RS-485总线向上位机进行报告,大大提高了此类产品的可靠性、方便性和网络化程度。此外,本设计采用了红外传感器,其具有气体选择性好,测量精度高,寿命长和不易老化等优点。
关键词:瓦斯检测 PIC16F877单片机红外吸收传感器
Abstract
Mine gas concentration monitoring, is directly related to the safety of coal production and the majority of the lives and safety of miners. Single-chip sensors and the development of a fairly rapid pace in recent years, with its own speed, high precision, easy to operate, reliable running is very suitable as the core of the gas monitoring sensors. Coal mine production safety in accordance with national norms, the paper design of a PIC16F877 microcontroller smart use of gas sensor, with the exception of a concentration shows that the traditional sound and light alarm functions, also has the function of the PC monitor, capable of gas concentration through the RS-485 bus crew reported upward, greatly improving the reliability of these products, convenience and the degree of work. In addition, the design uses an infrared sensor, its gas selectivity, and high measurement accuracy, long life and the advantages of aging is not easy.
Key words:gas detection PIC16F877 microcontroller infrared absorption sensors
目录
摘要 I
Abstract II
第1章绪论 1
瓦斯事故的危害 1
矿井安全监测装置的现行状况 2
国内外红外传感器发展情况 3
第2章 PIC系列单片机简介 5
PIC16F877单片机简介 5
PIC单片机的优越之处 5
PIC16F877管脚功能简介 6
引脚图 6
特殊内嵌功能 7
PIC16F877基本电路 8
PIC16F877I/O设备 9
PIC16F877指令简介 10
第3章甲烷探测仪硬件部分设计 12
红外甲烷气体检测的原理及红外气体检测仪简介 12
原理 12
红外气体检测仪的构成 13
IR32BC 14
红外光源 16
红外光源的选择 16
红外光源驱动 16
热释电探测器 18
热释电探测器原理 18
热释电探测器信号与气体浓度的关系分析 19
放大电路 21
与上位机通信设计 23
上位机与井下通讯方式 23
接口器件简介 24
通讯电路设计 27
报警、显示电路设计 29
系统电源电路设计 30
第4章甲烷探测仪软件部分设计 32
系统功能说明 32
主程序流程图 32
A/D转换程序流程图 33