目 錄
1 緒論................................................................................................1
　1.1發(fā)展概況與設(shè)計背景............................................................1
　1.2本設(shè)計概述........................................................................2
2總體設(shè)計方案........................................................... ................3
　2.1方案選擇論證....................................................... .............3
　2.2主控芯片單片機的選擇....................................... .............3
　　　2.2.1 AT89C51的主要性能.................................................4
　　　2.2.2 AT89C51的引腳結(jié)構(gòu).................................................5
　2.3傳感器的選擇..........................................................................6
　　 2.3.1傳感器的紅外輻射與紅外探測的原理結(jié)構(gòu)................7
　　2.3.2紅外測溫原理....................................................................7
　　2.3.3熱釋紅外傳感器的結(jié)構(gòu).................................................8
　　2.3.4 菲涅爾透鏡..................................................................10
　2.4熱釋電紅外傳感器控制電路芯片的選擇..........................11
3 系統(tǒng)硬件設(shè)計.......................................................................….13
　　3.1低頻帶通放大電路..............................................................13
　　3.2電壓比較整形電路..............................................................14
　　　3.2.1雙限電壓比較器的工作原理.......................................14
　　3.3報警電路..............................................................................15
　　3.4燈光警示電路......................................................................16
　　3.5狀態(tài)顯示電路......................................................................17
　　3.6供電電源電路......................................................................17
　　3.7單片機最小系統(tǒng)..................................................................18
4 系統(tǒng)軟件....................................................................................19
4.1主程序流程圖......................................................................19
4.2中斷函數(shù)流程圖..................................................................20
5結(jié)論.............................................................................................21
致謝................................................................................................22
參考文獻(xiàn)..............................................................................................23
附錄一：系統(tǒng)電路圖....................................................................24
附錄二：系統(tǒng)程序........................................................................25