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1. 发明授权

US6125695A Method and apparatus for measuring a fluid 失效
标题翻译：用于测量流体的方法和装置
公开(公告)号：US6125695A
公开(公告)日：2000-10-03
申请号：US949249
申请日：1997-10-13
申请人： William J. Alvesteffer , Yufeng Huang , Larry Eget
发明人： William J. Alvesteffer , Yufeng Huang , Larry Eget
IPC分类号： G01F1/684 , G01F1/698 , G01F1/68
CPC分类号： G01F1/698 , G01F1/6847
摘要： A flow sensor including a symmetrical sensor tube for carrying the fluid, first and second heaters symmetrically disposed at the sensor tube, and a first temperature sensor in thermal communication with the fluid. A flow meter including a flow sensor having a sensor tube, a first heater disposed at the sensor tube, a second heater disposed at the sensor tube, and a first temperature sensor in thermal communication with the fluid. The meter also includes a circuit for selectively applying power to the first and second heaters to maintain a temperature difference between a temperature of the first and second heaters and the temperature of the fluid, and for determining a difference in power supplied to the first and second heaters. A method including providing first and second heaters at a temperature a fixed amount above a temperature of the fluid; determining a difference in power supplied to the first and second heaters; and determining a measurement of the fluid from the difference in power supplied to the first and second heaters.
摘要翻译：流量传感器包括用于承载流体的对称传感器管，对称地设置在传感器管处的第一和第二加热器，以及与流体热连通的第一温度传感器。一种流量计，包括具有传感器管的流量传感器，设置在传感器管的第一加热器，设置在传感器管上的第二加热器和与流体热连通的第一温度传感器。仪表还包括用于选择性地向第一和第二加热器施加电力以维持第一和第二加热器的温度与流体温度之间的温度差并且用于确定供应到第一和第二加热器的功率差的电路加热器一种方法，包括在温度高于流体温度的一定温度下提供第一和第二加热器; 确定提供给第一和第二加热器的功率差; 以及根据供给到第一和第二加热器的功率差来确定流体的测量。

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