發(fā)布時(shí)間：2018-10-05 19:26

【摘要】：流量測(cè)量在工業(yè)生產(chǎn)和日常生活中起著重要的作用。超聲波流量計(jì)作為一種近幾十年出現(xiàn)的新型儀表，以其非接觸式測(cè)量、測(cè)量范圍寬、安裝簡(jiǎn)便以及特別適合大管徑及危險(xiǎn)性流體流量測(cè)量等特點(diǎn)，在石油、電力、醫(yī)藥、水資源管理等領(lǐng)域得到了廣泛的應(yīng)用。由于當(dāng)前技術(shù)所限，超聲波流量計(jì)產(chǎn)品普遍存在成本較高，測(cè)量準(zhǔn)確度低的問題，有待于對(duì)其進(jìn)一步的改進(jìn)和提高。 本設(shè)計(jì)選用FPGA作為信號(hào)處理核心器件，對(duì)系統(tǒng)所需的硬件電路進(jìn)行詳細(xì)的分析和設(shè)計(jì)，綜合考慮參數(shù)計(jì)算和器件選擇等問題，，設(shè)計(jì)匹配性能良好的發(fā)射電路、D/A轉(zhuǎn)換電路、接收電路、A/D轉(zhuǎn)換電路、顯示電路以及存儲(chǔ)電路，同時(shí)在FPGA內(nèi)部設(shè)計(jì)激勵(lì)信號(hào)發(fā)生、高速計(jì)數(shù)、邏輯控制和數(shù)據(jù)處理模塊來實(shí)現(xiàn)外圍器件的控制及液體流量的計(jì)算；給出了測(cè)量超聲波傳輸時(shí)間的算法設(shè)計(jì)及實(shí)現(xiàn)過程；本設(shè)計(jì)利用VHDL硬件描述語言實(shí)現(xiàn)各個(gè)模塊的功能并對(duì)所設(shè)計(jì)的模塊進(jìn)行仿真驗(yàn)證。 基于FPGA的超聲波流液體流量計(jì)是對(duì)現(xiàn)有的技術(shù)加以改進(jìn)和提高，借助FPGA在數(shù)據(jù)處理、邏輯運(yùn)算及邏輯控制等方面的強(qiáng)大功能，使所設(shè)計(jì)產(chǎn)品工作性能更加穩(wěn)定，測(cè)量可靠性更高。開發(fā)具有自主知識(shí)產(chǎn)權(quán)的超聲波液體流量計(jì)產(chǎn)品，不僅可以提升企業(yè)的綜合競(jìng)爭(zhēng)力，對(duì)今后超聲波流量計(jì)的設(shè)計(jì)具有一定的指導(dǎo)意義，更能創(chuàng)造一定的經(jīng)濟(jì)效益和社會(huì)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.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH814.92

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