【作者】 田晓娟；

【导师】 万金领；

【作者基本信息】 山东轻工业学院 ， 机械电子工程， 2008， 硕士

【摘要】 沉淀池是污水处理工程中的一个重要部分,对于沉淀池淤泥界面的测量目前国内普遍采用插杆目测或使用进口设备进行测量。前者方法简陋,测量误差大,而进口设备价格昂贵。所以面对我国污水处理厂的形势,研制一种成本低廉,便于国产化的淤泥界面测量系统具有非常重要的现实意义。本论文课题针对淤泥界面的检测展开工作,系统地分析了超声测距的基本原理,对超声波测距的误差精度进行了详细分析,提出一种基于AT89C51单片机的超声波淤泥界面检测系统。该系统由单片机,超声波发射电路,超声波接收电路,温度补偿电路,LED显示器等主要部分组成。该系统能够实现了对沉淀池内淤泥界面进行自动测量,并显示出来当前的界面位置,由于系统采用了温度补偿电路,提高了系统的测量精度。本课题的研究成功将有利于提高我国目前污水处理的自动化水平,提高劳动生产率、节能、降耗和降低污水处理厂建设及污水处理的单位运行成本费用。本论文内容即根据上述内容展开讨论:第一章介绍本课题的项目背景、目的和意义及本课题使用的相关检测技术的发展现状。第二章详细地分析了超声波检测技术的方法和原理。第三章给出了超声波进行界面检测的工作原理,并进行了误差分析,提出了时间误差和温度误差的补偿方法,设计了超声波淤泥界面检测系统的总体方案。第四章详细论述了系统的硬件组成电路,并进行了各功能模块的设计。第五章从软件体系结构的角度,对系统软件的总体设计和各个功能模块的设计作了详细介绍。更多还原

【Abstract】 Sedimentation tanks are one of the most important parts of sewage treatment works. Workers generally use sticks or imported instruments to measure sludge interface of the sedimentation tank in our country. The former is not only a simple and crude method but also not accurate while using imported instruments are very expensive, so it has a very important practical significance to develop a low-cost, homemade sludge interface system.This paper studies the detection of sludge interface in the sewage treatment factory. It analyzes the basic principles of the ultrasonic distance measurement by the numbers and gives a detailed analysis on error and precision of ultrasonic ranging. It presents a ultrasonic sludge interface detection system based on the AT89C51 single-chip microcomputer.The system consists of single-chip microcomputer, ultrasonic transmitter circuit, ultrasonic receiver circuit, temperature compensation circuit, LED display, and other major components. The system can realize automatic measurement of the sludge interface in the sedimentation tank, and show the current location of the interface. Because the system uses a temperature compensation circuit, it improves the measuring accuracy. The successful research of the issue will be conductive to improving China’s current level of automation in sewage treatment, improve productivity, conserve energy and reduce the unit cost of the sewage treatment plant construction and the operation of sewage treatment.The paper will include five sections:The chapter one introduces the background, meaning of the item and the development status of related detection technology.The chapter two analyzes the methods and principles of the ultrasonic detection technology in detail.The chapter three describes the working principle of the ultrasonic interface detection, carries out the error analysis, proposes the methods to compensate the time error and temperature error, and finally design the overall program of ultrasonic sludge interface detection system.The chapter four describes the hardware component circuit in detail, and gives the design of every functional module of the system hardware.The chapter five describes the overall software design of the system and the design of every functional module in detail from the perspective of software architecture.更多还原