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3. 发明授权

US3638487A Fluid characteristic sensing device 失效
标题翻译：流体特性传感装置
公开(公告)号：US3638487A
公开(公告)日：1972-02-01
申请号：US3638487D
申请日：1969-11-14
申请人： SANDS MEASUREMENT CORP
发明人： RASKIN SEYMOUR H
IPC分类号： G01F1/64 , G01N11/08 , G01F1/06
CPC分类号： G01N11/08 , G01F1/64
摘要： A device for sensing a characteristic, such as velocity or viscosity, of a fluid flowing through a flow conductor, the device having a housing connectable to the flow conductor and a tubular strain member having a longitudinal passage of the same internal diameter as the flow conductor disposed within the housing and constituting a section of the flow conductor, the strain member and the housing providing an annular chamber about the strain member, the fluid pressure of a fluid flowing through the flow conductor being communicated to the annular chamber by ports in the strain member or by a bypass conductor, and a plurality of strain gages spaced longitudinally of and bonded to the strain member and connected in a Wheatstone bridge circuit, the resistances of the strain gages at an upstream portion of the strain member varying as tension forces imposed on the upstream portion of the strain member and the resistances of strain gages at a downstream portion of the strain member varying as the compression forces imposed on the downstream portion by fluid flowing therethrough. The Wheatstone bridge provides an output voltage or signal which varies in accordance with the velocity of flow of the fluid through the strain member if the velocity of flow may vary and thus acts as a flow meter, or which varies in accordance with the viscosity of the fluid flowing through the strain member if the velocity of the fluid is constant and its viscosity may vary. The sensing device may also include means for sensing the temperature of the fluid to provide an output signal to a computer to which the output of the Wheatstone bridge is also transmitted so that the computer may provide an output signal, which is indicative of a certain characteristic of the fluid flowing therethrough, to a controlled device, such as a transducer, electrically operable valve, recorder and the like.
摘要翻译：一种用于感测流过流动导体的流体的速度或粘度的特性的装置，该装置具有可连接到流动导体的壳体和具有与流体导体相同内径的纵向通道的管状应变件设置在壳体内并构成流动导体的一部分，应变构件和壳体围绕应变构件提供环形室，流过导流体的流体的流体压力通过应变中的端口连通到环形室以及多个应变片，其纵向间隔并连接到应变构件并连接在惠斯登电桥电路中，应变片的上游部分处的应变片的电阻随着施加的张力而变化应变构件的上游部分和应变片的下游部分处的应变计的电阻变化通过流体流过其而施加在下游部分的压缩力。惠斯通电桥提供的输出电压或信号根据流体通过应变件的流速而变化，如果流速可能变化，并因此用作流量计，或者根据流量计的粘度而变化如果流体的速度恒定并且其粘度可能变化，则流过应变构件的流体。感测装置还可以包括用于感测流体的温度以向输出信号提供输出信号的装置，惠斯通电桥的输出也被传送到计算机，使得计算机可以提供输出信号，其表示某一特性流过其中的流体传送到受控装置，例如换能器，电动可操作的阀，记录器等。

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