基于温度压力补偿的风速计的研究
发布时间：2018-09-18 21:42
【摘要】：为了解决因气体的特性随温度压力的改变而改变造成超声波涡街风速计测量不准的问题,本文提出了一种基于温压补偿的风速测量方法。本文在全面分析涡街风速计的工作原理的基础上,比较了各类风速计的优缺点,设计了带有温压补偿的超声波涡街风速计,并可通过上位机软件对风速计进行远程监控。风速计由测风通道和风速处理电路组成,其中测风通道包含信号发生体和超声波探头,风速处理电路由超声波信号发射电路和信号采集处理电路构成。本文通过流体仿真技术(CFD)对信号发生体进行辅助设计;选用低功率精密振荡器LTC1799激励超声波换能器产生频率为150KHz的稳定的超声波载波信号;设计一系列模拟电路来实现对经过调制后的超声波信号进行解调;采用高精度的温压传感器BMP180来进行温压测量;利用性能稳定的AVR单片机Atmega128来作为风速计的控制器,用于进行数据采集处理、上位机通信和实时显示;利用虚拟仪器Labview对风速计进行远程检测和校准。通过标况下和变温度下风速测试的实验研究,证明了本文设计的风速计的实际测量范围为1.4m/s-30m/s,重复性小于0.5%。
[Abstract]:In order to solve the problem of inaccurate measurement of ultrasonic vortex anemometer caused by the change of gas characteristics with the change of temperature and pressure, a method of wind speed measurement based on temperature and pressure compensation is proposed in this paper. Based on the analysis of the working principle of vortex anemometer, this paper compares the advantages and disadvantages of all kinds of anemometers, designs an ultrasonic vortex anemometer with temperature and pressure compensation, and can monitor the anemometer remotely by the software of upper computer. The anemometer consists of a wind measuring channel and a wind speed processing circuit, in which the wind measuring channel includes a signal generator and an ultrasonic probe, and the wind speed processing circuit is composed of an ultrasonic signal transmitting circuit and a signal acquisition and processing circuit. In this paper, the signal generator is designed by fluid simulation technology (CFD), the low power precision oscillator (LTC1799) is used to excite the ultrasonic transducer to generate the stable ultrasonic carrier signal with the frequency of 150KHz. A series of analog circuits are designed to demodulate the modulated ultrasonic signal; the high-precision temperature and pressure sensor BMP180 is used to measure the temperature and pressure; the stable AVR microcontroller Atmega128 is used as the controller of the anemometer. It is used for data acquisition, communication and real-time display, and remote detection and calibration of anemometer with virtual instrument Labview. Through the experimental study of wind speed measurement under standard condition and variable temperature, it is proved that the actual measurement range of the anemometer designed in this paper is 1.4 m / s -30 m / s, and the repeatability is less than 0.5%.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH824
本文编号：2249168
[Abstract]:In order to solve the problem of inaccurate measurement of ultrasonic vortex anemometer caused by the change of gas characteristics with the change of temperature and pressure, a method of wind speed measurement based on temperature and pressure compensation is proposed in this paper. Based on the analysis of the working principle of vortex anemometer, this paper compares the advantages and disadvantages of all kinds of anemometers, designs an ultrasonic vortex anemometer with temperature and pressure compensation, and can monitor the anemometer remotely by the software of upper computer. The anemometer consists of a wind measuring channel and a wind speed processing circuit, in which the wind measuring channel includes a signal generator and an ultrasonic probe, and the wind speed processing circuit is composed of an ultrasonic signal transmitting circuit and a signal acquisition and processing circuit. In this paper, the signal generator is designed by fluid simulation technology (CFD), the low power precision oscillator (LTC1799) is used to excite the ultrasonic transducer to generate the stable ultrasonic carrier signal with the frequency of 150KHz. A series of analog circuits are designed to demodulate the modulated ultrasonic signal; the high-precision temperature and pressure sensor BMP180 is used to measure the temperature and pressure; the stable AVR microcontroller Atmega128 is used as the controller of the anemometer. It is used for data acquisition, communication and real-time display, and remote detection and calibration of anemometer with virtual instrument Labview. Through the experimental study of wind speed measurement under standard condition and variable temperature, it is proved that the actual measurement range of the anemometer designed in this paper is 1.4 m / s -30 m / s, and the repeatability is less than 0.5%.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH824
【参考文献】
相关期刊论文 前1条
1 李广峰,刘f ,高勇;超声波流量计的高精度测量技术[J];仪器仪表学报;2001年06期
，本文编号：2249168
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