改进超声波流量计性能的研究  

Research for Improving Performance of Ultrasonic Flowmeter

作　　者：黄建军[1] 刘存[1] 

机构地区：[1]沈阳工业大学,沈阳110023

出　　处：《仪器仪表学报》2001年第z1期87-88,共2页Chinese Journal of Scientific Instrument

摘　　要：介绍了时差法超声波流量计的结构原理和实现方法 ;采用锁相环路 (PL L)技术 ,提高了系统的测时分辨率 ;在接收信号处理上 ,采用了对数放大电器、窗口、脉宽检测等技术 ,有效地提高了系统的稳定性和可靠性 ;模块化的软件设计方便了用户的操作 。The paper discussed the structure principles and realization for the time difference ultrasonic flowmeter. Application of PLL technology heightens resolving capability of time measurement. To disposal of takeover signal, the logarithmic amplifier, window and pulse width detecting are utilized to improve the stability and reliability of the system. Module software design facilitates users' operation and further enhances performance of complete machine.

关 键 词：超声波流量计 时差 锁相环(PLL) 压控振荡器(VCO) 窗口 脉宽检测 

分 类 号：TH7[机械工程—仪器科学与技术]