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    • 10. 发明授权
    • Flow meter
    • 流量计
    • US06772643B2
    • 2004-08-10
    • US10410529
    • 2003-04-09
    • Osamu EguchiKoichi TakemuraShuji Ab
    • Osamu EguchiKoichi TakemuraShuji Ab
    • G01F166
    • G01F1/668
    • A flow meter measures a flow rate of fluid flowing through a flow passage based on a duration of propagation of an ultrasonic wave along the flow passage. A signal of the received ultrasonic wave is then compared with a reference voltage to detect an arrival of the ultrasonic wave. A voltage setting unit determines the reference voltage to an appropriate level according to a signal output from a propagation measuring unit which measures a duration of propagation of the ultrasonic wave along the flow passage from the start of transmission of the ultrasonic wave to the output of a signal from a judging unit as the reference voltage being changed. The reference voltage is determined readily and accurately, the flow meter measures the flow rate with the appropriate reference voltage.
    • 流量计基于超声波沿着流路的传播持续时间来测量流过流道的流体的流量。 然后将接收到的超声波的信号与参考电压进行比较,以检测超声波的到达。 电压设定单元根据从传播测量单元输出的信号来确定参考电压到适当的电平,该传播测量单元测量从超声波的发射开始到超声波的输出的超声波沿着流路的传播持续时间 当参考电压被改变时来自判断单元的信号。 参考电压被容易且准确地确定,流量计用适当的参考电压来测量流量。