摘要:超声波作为一种传输信息的媒体，由于其本身的直射性和反射性，以及不易受光照、电磁波等外界因素影响的特性，在探伤、测距、测速等多种领域越来越受到重视。
在测距领域，传统的测距方法都是用一种带有标准刻度的测量工具进行有接触的测量，这种测量方法虽然被广泛的应用在生活中，但在有些场合却无法完成测距的任务，如在井深，液位，管道长度的测量。而且这种方法在数据的读取和保存都需依靠人工的方法，对数据的后期处理也相对麻烦。为了克服传统测距方法在上述场合的不适用，在电子产品发展中，新兴出一种新的测距方法－非接触测距。
本文介绍了一种以PIC16F73为核心控制器的超声波测距模块的设计。论文首先介绍了超声波测距的基本原理，随后对几种可性的方案进行了方案论证，确定最后的设计方案，并对整个的设计方案作了详细的介绍。
关键词： 超声波；测距；非接触式；PIC单片机
Abstract:Ultrasonic is a kind of media that transmits information, It has many speciality,for example pounded and reflection, and not easy to be disturbed by the factors such as light, Hertzian waves. because of these unique advantages, ultrasonic get more and more attention of people on many areas,such as crack detection, range finding and speed trial.
In the area of range finding,the traditional methods are used a measurement tools with calibration standard and contact to the object to measure. Although this method has been widely used in life, but in some occasions, it could not complete range of tasks, such as the range finding of well depth, Level, and the measuring the length of the pipeline.And use this method of reading, the data getting and preservation rely on artificial methods,the data handling in late is also relatively trouble. To overcome the traditional methods ranging occasions in the above does not apply, with the development of electronic products, a new range finding methods-ranging non-contact is emerging.
This paper presents a Ultrasonic Ranging Module design which use PIC16F73 to the core controller. Papers first introduced the Ultrasonic Ranging basic principles , be followed demonstrate several of the plan, and determine the final design, finally describe entire design in detail.
Keyword： ultrasonic； range finding；non-contact；PICsinglechip
