电气工程封闭罐体液位测量装置的研究与设计大学学位论文.doc

摘 要 本文对当前国内外罐体的液位测量作了一定的研究，由于在众多液位测量的仪器中，基于超声波的液位测量应用前景较好，它属于非接触型液位测量，具有价格较为适中、安装使用方便、精度较高等优点，设计了一种能快速测量、稳定性好、测量精度高的新型罐体液位检测控制系统，它是采用回波测距原理制成的。文章主要阐述了对硬件实现电路、软件程序方面的设计。 本文所设计的罐体液位检测控制系统是以回波测距原理作为依据，对该系统的硬件电路进行了设计和编程，选用HR-SC04超声波测距模块来对罐体内的液位高度进行测量，AT89S52单片机作为主控制芯片，L298N模块作为驱动电机的转动模块。选用+5V直流电对整个系统进行供电。通过单片机来控制超声波测距模块对液位进行实时检测，根据液位高度值来控制电机的正反转来实现注水和排水，达到控制液位目的，并且通过12864液晶显示液位的高度值。通过进行测试实验，实验结果证明该系统可实时检测和控制液位高度并液晶显示，稳定可靠，重复测量精度高，该液位检测控制系统具有很好的理论和实用价值。 关键词：超声波；液位测量；AT89S52；液位控制系统 Abstract Certain research about current domestic and international liquid level measurement has been made in this article. Among these measuring apparatus, the one with ultrasonic is much better. It is a non-contact instrument using the theory of echo ranging. There are many advantages, such as the proper price, the convenience to install and operate, higher accuracy etc. The new liquid level measurement and control system was designed with rapid measurement, good stability and high accuracy. The paper mainly expounds the design of hardware circuit, software programs and measurement accuracy. The liquid level measurement and control system is based on the theory of echo ranging to design and program the hardware circuit. HR-SC04 ultrasonic ranging module is chosen to measure the height of liquid level and AT89S52 SCM as the main control chip, L298N module as the drive motor rotation module. Choose 5V DC power supply of the entire system. In order to control liquid level, Microcontroller has to control the ultrasonic ranging module for real-time detection and control the motor injection and draining depending on the level of height values the height of liquid level could be seen through 12864 LCD. By means of testing experiment, the results show that the system can do real-time detection, control the height of liquid and display the data. It is stable and reliable and has a higher precise measurement .It is believed that the liquid level measurement and control