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    • 5. 发明申请
    • A SYSTEM AND METHOD OFMEASURING CONVECTION INDUCED IMPEDANCE GRADIENTS TO DETERMINE LIQUID FLOW RATES
    • 测量流体流速的对流诱导阻抗等级的系统和方法
    • WO2004059257A2
    • 2004-07-15
    • PCT/US2003/041348
    • 2003-12-22
    • WATERS INVESTMENTS LIMITEDGERHARDT, Geoff, C.FADGEN, Keith, E.
    • GERHARDT, Geoff, C.FADGEN, Keith, E.
    • G01F
    • G01F1/6847G01N30/64G01N2030/324
    • A method and system for measuring the flow rate of a liquid or gas within a flow channel utilizing a centrally located excitation source and a plurality of sensor means. Said excitation means is comprised of a heating element coupled with an alternating current generator. Of the plurality of sensor means, at least one of said sensors is located in a position upstream of the excitation source location, and additionally a second of said plurality of sensors is located in a position downstream of the excitation source. Instantaneous fluid flow rate is calculated utilizing a high gain differential amplifier electrically coupled to said sensors, wherein the convectively induced inductive gradient of the flowing fluid is compared to the symmetrical zero flow induction gradient. Following such a comparison, a voltage signal proportional to the flow of fluid within the channel is derived.
    • 一种用于利用位于中心的激励源和多个传感器装置来测量流动通道内的液体或气体的流量的方法和系统。 所述激励装置包括与交流发电机耦合的加热元件。 在多个传感器装置中,至少一个所述传感器位于激励源位置的上游位置,并且所述多个传感器中的另一个位于激发源的下游位置。 利用电耦合到所述传感器的高增益差分放大器来计算瞬时流体流速,其中流动流体的对流感应感应梯度与对称零流感应梯度进行比较。 在进行这样的比较之后,导出与通道内的流体流量成比例的电压信号。