公开(公告)号：US06904799B2

公开(公告)日：2005-06-14

申请号：US10461540

申请日：2003-06-12

申请人： Adam J. Cohen ,  Josh E. Tang ,  Thomas R. Thibodeau

发明人： Adam J. Cohen ,  Josh E. Tang ,  Thomas R. Thibodeau

IPC分类号： G01F1/684 ,  G01F1/698 ,  G01F1/68

CPC分类号： G01F1/698 ,  G01F1/684

摘要： A system for measuring the velocity of a fluid can comprise a temperature sensor, for measuring the ambient temperature of the fluid, an RTD placed in the flow path of a fluid, the RTD being included as part of a Wheatstone bridge circuit, a digital potentiometer, the digital potentiometer also being included as part of a Wheatstone bridge circuit, and a controller coupled to the temperature sensor, the RTD and the digital potentiometer. In the system, the controller adjusts the digital potentiometer in response to an ambient fluid temperature signal from the temperature sensor such that the temperature of the RTD remains at a constant differential temperature above the ambient fluid temperature.

摘要翻译： 用于测量流体速度的系统可以包括用于测量流体的环境温度的温度传感器，放置在流体的流动路径中的RTD，RTD被包括在惠斯登电桥电路的一部分中，数字电位计 ，数字电位器也作为惠斯登电桥电路的一部分，以及耦合到温度传感器，RTD和数字电位器的控制器。 在系统中，控制器响应于来自温度传感器的环境流体温度信号调节数字电位器，使得RTD的温度保持在高于环境温度的恒定温差。