摘要
传统的流量测量中,由于超声波换能器的材质和气体介质两者的特性阻抗相差甚远,造成换能器发射和接收效率太低。该项目设计的超声流量计能够适合不同管道直径的测量,而且在管道内气体流速发生改变时,超声换能器所接收到的信号经放大、检波等处理后应保证信号的幅度不变。该系统对接收信号进行自动增益控制,并经过非线性校正后,测量精度极高,并具有良好的稳定性。
The traditional flow measurement,due to the material of ultrasonic transducer and the gas medium were a far cry from what the characteristic impedance of the two,causing the transducer transmitting and receiving efficiency was too low. Because this project requires the design of the ultrasonic flowmeter,then it can suitable for different pipe diameter measurement,and the gas flow velocity in the pipe was changed,ultrasonic transducer receives signal after amplification and detection,treatment should be to ensure that the signal amplitude unchanged. The system of automatic gain control signa was received,And after the nonlinear correction,it can provened high precision and good stability.
出处
《自动化与仪表》
2015年第9期22-24,共3页
Automation & Instrumentation
基金
河北省高等学校科学技术研究项目(ZD2014077)
