超聲波液位計的設(shè)計

電子信息工程論文編號:DZXX344  論文字?jǐn)?shù):7532,頁數(shù):28  附任務(wù)書，開題報告，中期檢查 
 
   目  錄
摘  要 3
ABSTRACT 4
第1章  緒論 5
1.1 課題的背景與意義 5
1.2  本文所做的工作 5
第2章  超聲波液位計工作原理 6
2.1  超聲波基本特性 6
2.2  超聲波液位計的測量原理 7
第3章  超聲波液位計的硬件設(shè)計 8
3.1 核心模塊 9
3.2 收發(fā)模塊 10
3.21發(fā)射超聲波電路 10
3.2.2  超聲波接收模塊 11
3.3 顯示報警模塊 12
3.31 顯示模塊 12
3.3.2報警模塊 13
3.4 EEPROM模塊 14
3.5  鍵盤模塊 15
第四章 超聲波液位計軟件設(shè)計 16
4.1  主程序 16
4.2  測量顯示子程序 17
4.2.1 Timecount子程序 17
4.2.2 T0中斷子程序 18
4.2.3  發(fā)超聲波測距子程序 19
4.2.4  LED顯示子程序 20
4.3  鍵盤掃描子程序 22
4.4   EEPROM存取子程序 23
4.4.1  讀EEPROM子程序 23
4.4.2  寫EEPROM子程序 24
第5章  誤差與干擾分析 25
5.1 溫度的影響 25
5.2 直達波的影響 25
結(jié)  論 26
致 謝 27
參考文獻 28

摘  要
本文設(shè)計用超聲波技術(shù)測液位,測量儀器可以不必浸入液體中,減少了儀器與液體之間的相互影響,避免了接觸污染,提高了安全性和可靠性。還具有較高的靈活性和較強的適應(yīng)性,可隨時改變用途(測距、測液位、測速等) 和測量對象。超聲波測距，可以應(yīng)用于汽車倒車、建筑施工工地以及一些工業(yè)現(xiàn)場的位置監(jiān)控，也可用于如液位、井深、管道長度的測量等場合。要求測量范圍在0.40-8.00m，測量精度1cm，測量時與被測物體無直接接觸，能夠清晰穩(wěn)定地顯示測量結(jié)果。由于超聲波指向性強，能量消耗緩慢，在介質(zhì)中傳播的距離較遠，因而超聲波經(jīng)常用于距離的測量，如測距儀和物位測量儀等都可以通過超聲波來實現(xiàn)。利用超聲波檢測往往比較迅速、方便、計算簡單、易于做到實時控制，并且在測量精度方面能達到工業(yè)實用的要求.

 關(guān)鍵詞  AT89S51   報警   超聲波  液位

ABSTRACT
This design using ultrasonic technology measure level, measuring instruments may not be immersed in the liquid, reduce the instrument and the interaction between liquid, avoid contact with pollution, raise the safety and reliability. Also has high flexibility and adaptability of strong, can always change USES (and measurement, etc) and measurement speed. Ultrasonic ranging, can be applied in automobile reverse construction site, and the position control, also can be used for such as level, deep, pipe length measurement etc. In the measurement range 0.4-8.00 m, measurement accuracy, being measured 1cm measurement with no direct contact with the object can clearly showed stable measurement result. Due to the strong, the energy consumption of ultrasonic directivity slowly in the medium of communication, distance, and is often used to measure the distance of ultrasonic, such as rangefinder and material level measurement instrument etc can all through the ultrasonic. Using ultrasonic detection tend to be quick, convenient, simple, easy to control, and in real-time measuring precision can reach the requirement of practical industrial. 　

     Keywords  AT89S51  alarm  ultrasonic  level