| 发明名称 |
Resonant conductor measurement system and method |
| 摘要 |
A method of measuring properties of a fluid that uses a conductor electrically connected to a current source. A magnetic field is created about the conductor and the conductor is introduced into the fluid medium. A current waveform, having a frequency, is periodically passed through the conductor, so as to cause the conductor to move, due to force exerted on the conductor from interaction of the current and the magnetic field. The conductor movement is sensed, producing a sense signal that is amplified into an amplified sense signal. The phase relationship between the current waveform and the amplified sense signal is measured and the current waveform frequency is adjusted to create a phase lock loop. The frequency when the phase lock loop is in lock state is measured as the phase between the excitation and the measured sense signal is varied, and fluid properties are calculated from the measured frequencies. |
| 申请公布号 |
US8752416(B2) |
申请公布日期 |
2014.06.17 |
| 申请号 |
US201213657617 |
申请日期 |
2012.10.22 |
| 申请人 |
|
发明人 |
Goodbread Joseph H.;Dual Juerg |
| 分类号 |
G01N11/16 |
主分类号 |
G01N11/16 |
| 代理机构 |
Timothy E. Siegel Patent Law, PLLC |
代理人 |
Timothy E. Siegel Patent Law, PLLC ;Siegel Timothy E. |
| 主权项 |
1. A method of measuring properties of a medium that is a fluid or compliant solid, such as a gel, comprising:
(a) providing a conductor electrically connected to a current source, so as to permit said current source to send a current through said conductor; (b) creating a magnetic field about said conductor; (c) introducing said conductor into said medium; (d) periodically sending a current waveform, having a frequency, through said conductor, so as to cause said conductor to move, due to force exerted on said conductor from interaction of said current and said magnetic field; (e) alternately sensing the conductor current and producing a sense signal at a sense signal node; (f) amplifying said sense signal to produce an amplified sense signal; (g) measuring the phase relationship between said current waveform and said amplified sense signal; (h) adjusting said current waveform frequency so as to create a phase lock loop; (i) measuring said frequency when said phase lock loop is in lock state and calculating fluid properties from said measured frequencies.
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