基于数模电的超声波测距系统摘要目录部分.doc

西南科技大学本科生毕业论文 III超声波测距系统设计摘要：本设计是基于模拟电路和数字电路的逻辑计算，从而实现对前方物体距离的测量。超声波指向性强，传播过程中衰减小，在介质中传播距离较远。所以，在利用传感技术和自动技术组合的测距方案中，超声波测距是目前应用比较广泛的一种，它大量地应用于防盗、倒车雷达、水位测量和工业现场。利用超声波传感器对前方物体进行感应后，通过相关电路对超声波传感器发射和接收到的信号进行逻辑分析和计算，最后将计算的结果显示在显示器上。超声波测距系统是根据超声波在介质中传播的反射原理，以超声波传感器为基础，应用数字芯片对超声波在介质中传播的时间进行计算，以此计算出超声波在介质中传播的距离，从而设计了一套超声波测距系统。该系统主要设计了超声波发射模块，超声波接收模块，滤波模块，计时模块，距离测量模块，显示模块等六个模块。论文中的设计是通过超声波传感器由发射模块发射超声波，接收模块接收到回波，通过计算后得到系统与前方物体之间的距离。关键词：超声波； 数字电路； 测距Ultrasonic Ranging SystemAbstract：The design is calculated based on digital logic circuit to realize the measurement of the distance in front of the object. Ultrasonic point to strong attenuation during transmission, the transmission distance in the medium is far. Therefore, in the use of sensor technology and automated technology portfolio ranging program, ultrasonic ranging is a broader application, it applied a lot of security, parking sensor, water level measurement and industrial scene.Using ultrasonic sensors on the front of the sensing objects, through the relevant circuit transmitting and receiving ultrasonic sensor signals to logical analysis and calculation, the final results of the calculation shown on the display.Ultrasonic ranging system is based on ultrasonic wave propagation in the medium reflection principle, the ultrasonic sensor, based on application of digital chips on ultrasonic propagation in the medium to calculate the time in order to calculate the ultrasonic wave propagation in the medium range, which is designed an ultrasonic ranging system.The system design of the ultrasonic transmitter module, ultrasonic receiver module, filter module, timing module, the distance measuring module, display module.Paper was designed by the transmitter module through the ultrasonic sensor ultrasonic transmitter, receiver module receives the echo, obtained by calculating the system and the distance between the front of the object.Key words：Ultrasonic，Digital circuit，Ranging目 录第一章 绪 论11.1 概述11.2 超声波的特点21.3 超声波测距原理21.4 超声波传感器31.5 超声波测距领域历史和国内外发展现状41.6 论文研究内容6第二章 系统设计准备72.1 超声波的衰减72.2 超声波的传播速度82.3 超声波传感器的选择92.4 发射脉冲波形102.5 测距系统的误差分析和修正112.6 超声波在空气中传播速度的补偿原理112.7 渡越时间测量误差的修正分析122.8 显示器件选择12第三章 超声波测距系统设计143.1 超声波发射模块143.2 超声波接收电