噪音檢測報警系統的設計與研究

電子機電論文編號:JD638  附任務書,答辯PPT,原理圖,論文字數:20496,頁數:48

目 錄

摘要…………………………………………………………………………….. ……………I
Abstract…………………………………………………………………………………… II
緒論………………………………………………………………………………………… 1
噪音檢測報警裝置原理………………………………………………………… 3
檢測電路的設計………………………………………………………………… 4
2.1傳感器的結構和性能指標…………………………………………………………4
2.2 放大電路的設計………………………………………………………………… 5
2.3 V/F壓頻轉換器的應用及外部電路………………………………………………8
2.3.1 壓頻轉換器的結構………………………………………………………… 8
2.3.2 V/F轉換的基本原理……………………………………………………… 10
2.4 AT89C51單片機的硬件結構…………………………………………………… 12
2.4.1 單片機的封裝及管腳功能………………………………………………… 13
2.4.2 單片機的中央處理器及振蕩電路………………………………………… 15
2.4.3 單片機的復位電路………………………………………………………… 18
報警電路及顯示電路的設計…………………………………………………… 20
3.1 報警電路的設計及555的原理………………………………………………… 20
3.1.1 NE555的硬件結構………………………………………………………… 20
3.1.2 報警電路的設計…………………………………………………………… 26
3.1.3 設計思想…………………………………………………………………… 29
3.2 顯示電路的設計及LCD的結構………………………………………………… 30
3.2.1 LCD的結構、指令功能和特點………………………………………………30
3.2.2 指令說明…………………………………………………………………… 33
第四章 穩壓電源的設計………………………………………………………………… 36
第五章 噪音報警裝置的軟件設計……………………………………………………… 38
結論………………………………………………………………………………………… 42
參考文獻…………………………………………………………………………………… 43
致謝………………………………………………………………………………………… 44
附錄………………………………………………………………………………………… 45

摘 要

環境噪聲監測，是人類提高生活質量，加強環境保護的一個重要環節，在各大城市的繁華街區和居民區，已有大型環境噪聲顯示器豎立街頭。但目前國內的便攜式噪聲測試儀，多為價格昂貴的進口專用設備，除衛生、計量等環保專業部門擁有外，無法作為民用品推廣普及。本文介紹一種以89C51單片機為核心，采用V/F轉換技術構成的低成本、便攜式數字顯示環境噪聲測量儀。該儀器工作穩定、性能良好，經校正測量誤差小于1dB，測量范圍為40——96dB，能滿足一般民用需要，可廣泛應用于工礦企業、機關學校等需要對環境噪聲進行測量和控制的場合。

關鍵字：單片機；環境噪音；聲壓級；測量

Design and Studying of the warning systerm of noise measuring

Abstract
Environmental noise monitoring, it is the mankind that improves life quality, strengthen an important link of environmental protection, in the flourishing block of every large city and residential block , there are large-scale ambient noise displays that have erected the street already. But the domestic portable noise tester at present, are mostly imported dedicated devices costing an arm and a leg, except that there are such specialized departments of environmental protection as the hygiene , measuring ,etc., unable to is it popularize to popularize as civil product. This text introduces a kind of core of regarding 89C51 one-chip computer as, adopt low cost , portable digital display ambient noise measuring apparatus that V/F switch technology formed . This working stability of instrument , performance are good, smaller than 1dB through correcting the error of measuring, it is 40 to measure the range --96dB, can meet general civil need , can apply industrial and mining enterprises , organ school ,etc. need measure ambient noise and occasion that control extensively.

Key words:One-chip computer Ambient; noise; Sound pressure grade ;Measurement