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    • 3. 发明申请
    • REYNOLDS NUMBER CORRECTION FUNCTION FOR MASS FLOW RATE SENSOR
    • 质量流量传感器的雷诺数修正函数
    • WO2006055314A3
    • 2006-08-10
    • PCT/US2005040280
    • 2005-11-07
    • MKS INSTR INCSHAJII ALIMENEGHINI PAUL
    • SHAJII ALIMENEGHINI PAUL
    • G01F5/00G01F1/684G01F1/696G01F15/04
    • G01F15/046G01F1/6847G01F1/6965G01F5/00
    • A mass flow rate sensor uses a Reynolds number correction function to compensate for errors in a bypass ratio of the sensor for all gases, based on the fact that all bypass errors are functions of Reynolds number. The sensor includes a sensor tube and a bypass tube dividing flow, wherein a bypass ratio of the sensor equals a total flow rate through the sensor divided by a flow rate through just the sensor tube. Heater elements heat an upstream portion and a downstream portion of the sensor tube, and a circuit is connected to the heater elements for producing a voltage based upon a difference in resistance between the heater elements. The voltage is calibrated based on known flow rates of a reference gas, and the flow rate through the sensor is based upon the calibrated voltage multiplied by a multi-gas correction function and a Reynolds number correction function.
    • 基于所有旁路误差都是雷诺数的函数的事实,质量流率传感器使用雷诺数校正函数来补偿所有气体的传感器的旁路比中的误差。 传感器包括传感器管和分流管的旁路管,其中传感器的旁路比等于通过传感器的总流量除以仅通过传感器管的流速。 加热器元件加热传感器管的上游部分和下游部分,并且电路连接到加热器元件,用于基于加热器元件之间的电阻差产生电压。 电压基于已知的参考气体流量进行校准,并且通过传感器的流量基于校准电压乘以多气体校正函数和雷诺数校正函数。
    • 4. 发明申请
    • THERMAL MASS FLOW RATE SENSOR PROVIDING INCREASED RATE OF HEAT TRANSFER TO GAS
    • 热质量流量传感器向燃气传热提供了更高的速率
    • WO2005098375A2
    • 2005-10-20
    • PCT/US2005009800
    • 2005-03-24
    • MKS INSTR INCSHAJII ALIMENEGHINI PAULMYATT LEONARD
    • SHAJII ALIMENEGHINI PAULMYATT LEONARD
    • G01F1/68G01F1/684G01F5/00
    • G01F1/6847G01F5/00
    • A sensing apparatus for use in a mass flow rate sensor for measuring a fluid flow rate includes a main conduit for containing a fluid flow, and a capillary tube for tapping a portion of the fluid flow from the main conduit at a first location, and returning the portion of the fluid flow to the conduit at a second location. The capillary tube is disposed about a centerline, and includes an inner wall defined by an inside radius measured from the centerline. The inside radius varies periodically, preferably sinusoidally, along the centerline for at least a portion of the capillary tube, thereby forming a turbulated surface on the inner wall. The turbulated inner wall increases wall surface area, and fluid mixing. The resulting increased heat transfer rate decreases the error in sensor output from nonlinear behavior.
    • 一种用于测量流体流量的质量流量传感器中的传感装置包括用于容纳流体流的主管道和用于在第一位置处从主管道中抽出流体流的一部分的毛细管, 该部分流体在第二位置流向导管。 毛细管围绕中心线布置,并且包括由从中心线测量的内径限定的内壁。 内部半径沿着毛细管的至少一部分的中心线周期性地,优选地正弦地变化,由此在内壁上形成紊流表面。 紊流的内壁增加了壁面积和流体混合。 由此产生的增加的传热速率减少了非线性行为导致的传感器输出误差。
    • 5. 发明专利
    • DE112005002773T5
    • 2007-10-31
    • DE112005002773
    • 2005-11-07
    • MKS INSTR INC
    • SHAJII ALIMENEGHINI PAUL
    • G01F1/68G01F1/684G01F5/00
    • A mass flow rate sensor uses a Reynolds number correction function to compensate for errors in a bypass ratio of the sensor for all gases, based on the fact that all bypass errors are functions of Reynolds number. The sensor includes a sensor tube and a bypass tube dividing flow, wherein a bypass ratio of the sensor equals a total flow rate through the sensor divided by a flow rate through just the sensor tube. Heater elements heat an upstream portion and a downstream portion of the sensor tube, and a circuit is connected to the heater elements for producing a voltage based upon a difference in resistance between the heater elements. The voltage is calibrated based on known flow rates of a reference gas, and the flow rate through the sensor is based upon the calibrated voltage multiplied by a multi-gas correction function and a Reynolds number correction function.