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    • 4. 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。
    • 7. 发明申请
    • FLOW RATE MEASUREMENT DEVICE
    • 流量测量装置
    • US20110246098A1
    • 2011-10-06
    • US13139425
    • 2009-12-25
    • Koichi TakemuraFumikazu ShibaDaisuke Bessho
    • Koichi TakemuraFumikazu ShibaDaisuke Bessho
    • G01F1/66
    • G01F1/667
    • Switching a transmitting and receiving direction of two transducers (2,3) in the forward and the reverse direction, a time differential memory part (17b) storing a propagation time differential every K times a unit measurement process being executed, the propagation time differential being a differential between a propagation time of the ultrasonic wave signal in a forward direction and in a reverse direction, a flow rate calculating part (15) calculating a flow rate of a passing fluid based on a lump sum of propagation times in both the forward and the reverse directions obtained at least every K times of a unit measurement process being executed, an estimating part (18) estimating a change in a momentary flow rate of the fluid based on the time differential obtained every K times of the unit measurement process being executed and storing thereof in a time differential memory part (17b), thus obtaining an accurate flow rate and detecting the change in the momentary flow rate.
    • 在正向和反向切换两个换能器(2,3)的发送和接收方向的时间差分存储器部分(17b)每执行一个单位测量过程每K次存储传播时间差,传播时间差为 超声波信号在正向和反向的传播时间之间的差分,流量计算部分(15),基于传播时间的一次总和来计算流过的流体的流量 执行单元测量处理的至少每K次获得的相反方向,基于执行的单位测量处理每K次获得的时间差估计流体的瞬时流量变化的估计部(18) 并将其存储在时间差分存储部分(17b)中,从而获得准确的流量并检测瞬时流量的变化。