摘要近年来，随着科技的进步和新理论、新材料的发现，催生了材料、技术、理论的长足发展和进步。单片机及微控制器价格的降低和厂家的积极推广，越来越多的人加入到使用微控制器的行列。在单片机作为控制器普遍使用的今天，系统控制的设计基本采用为控制器加电子电路和传感器的模式。46002
数年以前，在传感器领域里面使用超声波传感器作为测量和检测模块一直是备用的选择，设计人员唯有在无法使用其他替代技术的前提下才会选用超声波作为测量和检测模块，因为当时的技术条件限制了超声波传感器的精度和使用寿命等一系列因素。近年来，科技的进步促进了超声波传感器无论在坚硬程度、使用寿命还是测量精度上都取得了很大的进步，这些新出现的技术也使得超声波传感器可以更加灵活、方便地使用到其他的测量领域，比如：海洋探查与开发、检测、医学诊断、导航、地形地貌测绘等领域。
随着超声波传感器的兴起和广泛使用，如何在设计的电路中精准地控制超声波传感器的工作状态成为控制的难点。本文研究的内容立足于超声波传感器的控制电路进行研究，论证系统的可行性并进行实际电路的设计，以最终实现能对超声波发生和精准控制为目的，实现对超声波的周次检测及发射周次控制。
毕业论文关键词：超声波；控制电路；周次检测；周次控制
ABSTRACT
In recent years, with the progress of science and the discovery of new theories and new materials, materials, technology and theory has a rapid development and progress. With the reduction of the price of microcontroller and SOC，and with the actively promote of the manufacturers, more and more people join to the ranks who is using microcontroller.
A few years ago, use ultrasonic sensor as measuring and testing module is always an alternate selection in sensor filed, designer only when it is unable to use the premise of other alternative technologies will use ultrasonic as a measurement and detection module, because the limit of technology of that time has an effect on the ultrasonic sensor accuracy and use life, etc. In recent years, the progress of science and technology has made a great progress on the ultrasonic sensor whether in hard, use life or measuring accuracy, these new technologies also makes the ultrasonic sensors can be more flexible and more convenient use to other measurement field, for example: marine exploration and development, detection and evaluation, medical diagnosis, navigation, etc.
With the rise and wide use of the ultrasonic sensor, how to control the working status of the ultrasonic sensor in the designed circuit has become a difficult problem. This paper based on the study of the control circuit of ultrasonic sensor, demonstration the executable and design the actual circuit, in order to achieve the accurate control to ultrasonic generator, to achieve the accurate control of the wave period.
Key Words：ultrasonic; control circuit; detection of period; period control
目 录
第一章 绪论 1
1.1超声波发展的历史 1
1.2超声波当前应用现状 1
1.3超声波发展趋势 2
1.4超声波发生和控制电路设计的意义 2
第二章 超声波发生和控制的原理研究 3
2.1超声波发生器原理 3
2.2超声波接收器原理 3
2.3系统设计拟采用的方法 4
第三章 硬件实现与软件 7
3.1系统组成 7
3.1.1系统供电电路 7
3.1.2文氏电桥振荡器电路 8
3.1.3带通滤波电路 9
3.1.4模拟开关电路 10 超声波发生及控制电路设计:http://www.751com.cn/tongxin/lunwen_47637.html