基于FPGA的超声波液体流量计的设计

发布时间：2018-10-05 19:26

【摘要】：流量测量在工业生产和日常生活中起着重要的作用。超声波流量计作为一种近几十年出现的新型仪表，以其非接触式测量、测量范围宽、安装简便以及特别适合大管径及危险性流体流量测量等特点，在石油、电力、医药、水资源管理等领域得到了广泛的应用。由于当前技术所限，超声波流量计产品普遍存在成本较高，测量准确度低的问题，有待于对其进一步的改进和提高。本设计选用FPGA作为信号处理核心器件，对系统所需的硬件电路进行详细的分析和设计，综合考虑参数计算和器件选择等问题，，设计匹配性能良好的发射电路、D/A转换电路、接收电路、A/D转换电路、显示电路以及存储电路，同时在FPGA内部设计激励信号发生、高速计数、逻辑控制和数据处理模块来实现外围器件的控制及液体流量的计算；给出了测量超声波传输时间的算法设计及实现过程；本设计利用VHDL硬件描述语言实现各个模块的功能并对所设计的模块进行仿真验证。基于FPGA的超声波流液体流量计是对现有的技术加以改进和提高，借助FPGA在数据处理、逻辑运算及逻辑控制等方面的强大功能，使所设计产品工作性能更加稳定，测量可靠性更高。开发具有自主知识产权的超声波液体流量计产品，不仅可以提升企业的综合竞争力，对今后超声波流量计的设计具有一定的指导意义，更能创造一定的经济效益和社会效益。
[Abstract]:Flow measurement plays an important role in industrial production and daily life. Ultrasonic Flowmeter, as a new type of instrument in recent decades, has the characteristics of non-contact measurement, wide measuring range, simple installation, especially suitable for large pipe diameter and dangerous fluid flow measurement, etc., in petroleum, electric power, medicine, etc. Water resources management and other fields have been widely used. Due to the limitation of current technology, ultrasonic Flowmeter products generally have the problems of high cost and low measurement accuracy, which need to be further improved and improved. This design chooses FPGA as the signal processing core device, carries on the detailed analysis and the design to the system needed hardware circuit, synthetically considers the parameter calculation and the device selection, designs the matching performance good transmitting circuit / D / A conversion circuit. The receiving circuit includes A / D conversion circuit, display circuit and storage circuit. At the same time, the excitation signal generation, high speed counting, logic control and data processing module are designed in FPGA to realize the control of peripheral devices and the calculation of liquid flow. The algorithm design and realization process of measuring ultrasonic transmission time are given, and the function of each module is realized by VHDL hardware description language, and the simulation of the designed module is carried out. The ultrasonic flow liquid Flowmeter based on FPGA improves and improves the existing technology. With the help of the powerful functions of FPGA in data processing, logic operation and logic control, the working performance of the designed product is more stable. The measurement is more reliable. The development of ultrasonic liquid Flowmeter with independent intellectual property rights can not only enhance the comprehensive competitiveness of enterprises, but also have certain guiding significance for the design of ultrasonic Flowmeter in the future, and can also create certain economic and social benefits.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH814.92

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