发明名称 |
Apparatus for capacitive electrical detection |
摘要 |
Apparatus for capacitive electrical detection or measurement relating to a medium, comprising at least one electrode having a given surface extension and an oscillator circuit the output frequency of which is a function of the capacitance being associated with the electrode and the dielectric constant of the medium, and is taken as a basis for the detection or measurement. The effective spacing of the electrode from a counter electrode or from earth is of the same or a substantially higher order of magnitude as seen in relation to the surface extension of the electrode. A conductor connecting the electrode to the oscillator circuit has a length that is a small fraction as seen in relation to the surface extension of the electrode.
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申请公布号 |
US6420882(B1) |
申请公布日期 |
2002.07.16 |
申请号 |
US19990402635 |
申请日期 |
1999.11.12 |
申请人 |
SENTECH AG |
发明人 |
ENGEBRETSEN BJOERN;HALLERAKER JON MORTEN |
分类号 |
G01F23/26;G01N27/22;(IPC1-7):G01R27/26 |
主分类号 |
G01F23/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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