发明公开
EP1329712A1 Fluid property and flow sensing via a common frequency generator and fast fourier transform
有权
热DRUCHFLUSSMESSUNG或流体的其他功能通过确定频率测量
- 专利标题： Fluid property and flow sensing via a common frequency generator and fast fourier transform
- 专利标题（中）： 热DRUCHFLUSSMESSUNG或流体的其他功能通过确定频率测量
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申请号： EP03002675.1申请日： 1998-12-03
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公开(公告)号： EP1329712A1公开(公告)日： 2003-07-23
- 发明人: Kubisiak, David , Bonne, Ulrich
- 申请人： Honeywell Inc.
- 申请人地址： Honeywell Plaza MN12-8251 P.O. Box 524 Minneapolis Minnesota 55440-0524 US
- 专利权人： Honeywell Inc.
- 当前专利权人： Honeywell Inc.
- 当前专利权人地址： Honeywell Plaza MN12-8251 P.O. Box 524 Minneapolis Minnesota 55440-0524 US
- 代理机构： Hucker, Charlotte Jane
- 优先权： US1453 19971231
- 主分类号： G01N25/18
- IPC分类号： G01N25/18 ; G01N25/00 ; G01N27/18 ; G01F1/708 ; G01F1/698 ; G01F1/699 ; G01P5/12 ; G01P5/18 ; G01N25/20
摘要：
A method for determining a property of a fluid of interest comprises the following steps:
energizing a heater (402) and a first sensor (404) with at least two timevarying input signals, each having a different frequency, wherein the heater (402) and the first sensor (404) are thermally coupled to the fluid of interest and have a resistance that change with temperature;
sensing the resistance change of the first sensor;
determining a lag between selected ones of the at least two time-varying input signals and the corresponding resistance change of the first sensor; and
determining a first ideal input frequency that would produce a phase lag between an ideal time-varying input signal and the resistance change of the first sensor that substantially equals a first calibrated phase lag value.
energizing a heater (402) and a first sensor (404) with at least two timevarying input signals, each having a different frequency, wherein the heater (402) and the first sensor (404) are thermally coupled to the fluid of interest and have a resistance that change with temperature;
sensing the resistance change of the first sensor;
determining a lag between selected ones of the at least two time-varying input signals and the corresponding resistance change of the first sensor; and
determining a first ideal input frequency that would produce a phase lag between an ideal time-varying input signal and the resistance change of the first sensor that substantially equals a first calibrated phase lag value.
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