Research On Ultrasonic Sludge Interface Detection System Based On Single-chip Microcomputer

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.