利用超声波检测流量的高精度系统  

Development of High Precise Flow Measurement with Ultrasonic

作　　者：王艳霞[1] 傅星[1] 胡小唐[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2003年第2期248-250,共3页Journal of Tianjin University：Science and Technology

摘　　要：讨论了超声波在流体内传播过程中流速补偿问题,建立了流量测量的数学模型,并给出测量系统的结构框图.针对超声检测流量中的流场分布情况,采用高电压窄脉冲信号触发超声波发射电路、高频振荡计数与相敏检波相结合的高精度在线检测方法提高测量的精度,并利用系统内存储的测量环境数据和实际测量时的温度对测量结果进行补偿,保证测量的稳定性;分析了测量误差来源以及消除误差的方法.The mathematics model of measurement and the frame of system are constructed with the ultrasonic transmission in the flow,based on the flow velocity compensation. For the distribution of the flowfield in the flow measurement by ultrasonic,the measuring precision is improved by the circuit of ultrasonic emission in using high voltage and narrow tripping pulse,the circuit of high frequency oscillation and counter,and the circuit of phase demodulation.The result is compensated by the conditional data that has been stored in the system and the measurement of temperature at the same time.The error sources of measurement and the possible calibration methods are deeply analyzed.

关 键 词：超声波 流速分布补偿 流量检测 测量模型 

分 类 号：TH814[机械工程—仪器科学与技术]