本文關(guān)鍵詞： 超聲 激光 測流 快速傅里葉變換 FPGA RS485 LCD1602　出處：《南京理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題旨在對超聲波和激光結(jié)合的實時在線測流技術(shù)進(jìn)行研究,對超聲測流技術(shù)中的實測線速度和線平均速度的關(guān)系進(jìn)行了推導(dǎo)論證,對超聲測流和激光測流的優(yōu)缺點進(jìn)行了分析,設(shè)計了超聲測流和激光測流結(jié)合的總體實現(xiàn)方案,同時提出了對測流信號進(jìn)行信號處理的方案。在總體方案確定的基礎(chǔ)上進(jìn)行一些器件的選型,設(shè)計了超聲波收發(fā)電路,實現(xiàn)了超聲測流部分的AD轉(zhuǎn)換電路,設(shè)計了光電信號轉(zhuǎn)換電路,在FPGA上實現(xiàn)了驅(qū)動超聲發(fā)射電路的DDS數(shù)字信號發(fā)生器,實現(xiàn)了基于FPGA的激光多普勒測流信號的FFT處理模塊和基于FPGA的超聲測流信號預(yù)處理的FIR數(shù)字濾波器,實現(xiàn)了基于FPGA的LCD顯示模塊和基于FPGA的RS485串口通信模塊以實現(xiàn)在線功能,設(shè)計了RS485接口電路。通過實驗驗證了業(yè)已實現(xiàn)的超聲測流部分的AD轉(zhuǎn)換電路的功能,分別測試了基于IP核的1024點FFT和不基于IP核的16點FFT的分辨頻率的功能,通過和上位機(jī)的通信驗證了基于FPGA的RS485的串口通信協(xié)議。
[Abstract]:The purpose of this paper is to study the real-time on-line flow measurement technology combined with ultrasonic and laser, and to deduce and demonstrate the relationship between the measured line velocity and the line average velocity in the ultrasonic current measurement technology. The advantages and disadvantages of ultrasonic flow measurement and laser current measurement are analyzed, and the overall scheme of combining ultrasonic current measurement with laser current measurement is designed. At the same time, the scheme of signal processing for current measurement signal is put forward. On the basis of the determination of the overall scheme, some devices are selected, the ultrasonic transceiver circuit is designed, and the AD conversion circuit of ultrasonic current measurement part is realized. The photoelectric signal conversion circuit is designed, and the DDS digital signal generator which drives the ultrasonic transmitting circuit is realized on FPGA. The FFT processing module of laser Doppler current measurement signal based on FPGA and the FIR digital filter of ultrasonic current measurement signal preprocessing based on FPGA are implemented. The LCD display module based on FPGA and the RS485 serial port communication module based on FPGA are realized to realize the on-line function. The RS485 interface circuit is designed, and the function of AD conversion circuit of ultrasonic current measurement is verified by experiments. The function of resolving frequency of 1024-point FFT based on IP core and 16:00 FFT without IP core is tested, respectively. The serial communication protocol of RS485 based on FPGA is verified by communication with host computer.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB559;TN249

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本文編號：1555732