文档介绍：摘要
介绍了超声波测距的基本原理和系统框图,给出了超声波发射和接收电路,通过盲区的消除以及环境温度的采样,提高了测距的精确度。利用超声波传输中距离与时间的关系,采用8051单片机进行控制及数据处理,设计出了能精确测量两点间距离的超声波液位检测系统。系统主要由超声波发射器电路、超声波接收器电路、单片机控制电路、环境温度检测电路及显示电路构成。利用所设计出的超声波液位检测系统,对液面进行了测试,采集当时的环境温度获得精确的速度,计算出液面距离。此系统具有易控制、工作可靠、测量精度高的优点,可实时检测液位。
关键词: 超声波,液位测量,温度传感器
Abstract
Introduces the basic principles of ultrasonic rangefinder and system diagrams, gives ultrasonic transmitter and receiver circuit, Through the elimination of dead zone and the sample of ambient temperature, which improves the accuracy of the measuring distance. Use the relation between Ultrasonic transmission distance and time, take the 8051 microcontroller to control and data processing, devised to accurately measure the distance between two points of ultrasonic level detection system. The system is primarily consist of the ultrasonic transmitter, ultrasonic receiver circuit, microcontroller circuit, the ambient temperature detection circuit and show circuit. Use the ultrasonic level detection system, on the surface of a test, collecting at ambient temperature and getting an accurate speed, calculate the surface distance. This system is easy to control, reliable, high precision, real-time detection level.
Key words:Ultrasonic ,level measurement, temperature sensors
目录
前言………………………………………………………………………………1
1 总体概述………………………………………………………………………2
2 超声波和超声波传感器………………………………………………………3
超声波…………………………………………………………………3
定义……………………………………………………………3
超声波的主要参数……………………………………………3
超声波的特性…………………………………………………3
超声波的特点…………………………………………………3
超声波传感器的主要应用……………………………………3
超声波传感器测距原理………………………………………………4
超声波传感器…………………………………………………4
超声波传感器的性能指标……………………………………4
超声波传感器的结构…………………………………………5
超声波测距原理………………………………………………5
3 MCS-51系列单片机……………………………………………………………7
8051单片机的总体结构………………………………………………7
8051单片机的总体框图和功能………………………………7
8051的引脚功能………………………………………………8
8051单片机的定时器/计数器………………………………………10
8051的定时器/计数器功能…………………………………10
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