摘要
为了实现对大流量气体流量的准确测量,设计了一种超声波气体流量计。系统以STM32和FPGA为控制核心,利用双超声波传感器分别在顺流和逆流方向发射超声波,通过高精度计时电路分别记录顺流和逆流方向时超声波传播的时间差,再利用时间差与气体流量的关系来计算得到气体流量值。实际测试结果表明,系统具有较高的测量精度,在低流速测量时,相对误差较大约8%;随着气体流速的增加,系统测量精度逐渐增加,在流速超过10 m/s时,相对误差小于1%。
In order to realize the accurate measurement of the flow rate of large flow gas,an ultrasonic gas flow meter was designed.The system uses STM32 and FPGA as the control core,and uses two ultrasonic sensors to transmit ultrasonic waves in the forward and reverse directions respectively.The high-precision timing circuit records the time difference of ultrasonic propagation in the forward and reverse directions respectively,and then the relationship between time difference and gas flow rate is used to calculate the gas flow rate.The actual test results show that the system has higher measurement accuracy.When measuring at low flow rate,the error is large,about 8%.With the increase of gas flow rate,the measurement accuracy of the system increases gradually.When the flow rate exceeds 10 m/s,the error is less than 1%.
作者
葛健炎
丁煜
GE Jian-yan;DING Yu(College of Mechanical Engineering,Yangzhou University,Yangzhou 225100,China)
出处
《仪表技术与传感器》
CSCD
北大核心
2020年第10期29-32,共4页
Instrument Technique and Sensor
基金
国家自然科学基金项目(51475409)。
