摘要距离的测量在生产生活中需求广泛，传统测量方式无法满足例如油罐内部液位测量、倒车雷达等特殊场合，新型距离测量方式亟待研究运用。超声波由于其传播方向集中、可以传播较远距离、能量较大、满足机械波在介质中传播规律等特性，不仅利于科研人员研究，还完全可以满足非接触式测量的要求，因此可以发展出超声波测距的系统与方法。
本课题拟采用 ，以其最小系统为核心，加装各硬件电路模块，实现超声波发射与接收，并按一定算法计算得目标距离，还根据温度与声速关系补偿误差，最后将距离结果显示给使用者，此外还有电源供电和蜂鸣报警功能，构成超声波测距系统；同时由于单片机需要指令控制，设计了软件程序部分。本文介绍了课题研究的背景与意义、超声波测距原理、硬件电路原理、软件设计流程等部分，对于高精度超声波测距仪有着完整的阐述。28662
关键词  测距系统     超声波   硬件设计
毕业论文设计说明书外文摘要
Title   Design of  High  Precision  Ultrasonic  Distance Measurement System                               
Abstract
Distance measurement demands widely in the production and living,traditional way cannot satisfy such as inside the tank liquid level measurement, reversing radar and other special occasions,a new distance measure way is required to  be studied.The ultrasound,as its  focus propagation direction, can be transmitted further more, greater energy, to meet the mechanical wave propagation in the medium and other characteristics,not only conducive to the researchers studied, but also  fully meet the requirements of non-contact measurement,so we can develop a new system and method for distance ranging.
The issue attends to adopt  ,using its minimum system as the core.Besides,I add the hardware circuit modules,to realize the ultrasonic transmitting and receiving function,and according to certain algorithm to compute target distance.It also according to the relationship between temperature and the velocity of sound compensates error,finally  it display the results to the user.In addition to the power supply and the buzzer alarm function,altogether they constitute the ranging system.At the same time because of the single chip microcomputer need to command control,I design the software program.This paper introduces the research background and significance,Hardware and software principles,etc.For high-precision ultrasonic range finder has a complete exposition.
Keywords  Distance measurement, , Hardware design, ultrasonic
目   次
1  绪论    1
1.1  课题背景及研究意义    1
1.2  国内外研究现状    2
1.3  课题研究内容及章节安排    3
2  超声波测距相关介绍    5
2.1  超声波简介    5
2.2  超声传感器简介    6
2.3  超声波测距原理    8
2.4  影响超声波测距的因素    8
3  超声波测距系统硬件设计    10
3.1 总体方案设计    10
3.2 AT89S52单片机最小系统    11
3.3 超声波发射模块    12
3.4 超声波接收模块    13
3.5 液晶显示模块    14
3.6 温度补偿模块    15
3.7 电源模块    16
3.8 报警模块    16
4  超声波测距系统软件设计    17 AT89S52单片机高精度超声波测距仪的设计:http://www.751com.cn/tongxin/lunwen_23594.html