| 摘要 |
Apparatus for capacitive electrical detection or measurement relating to a medium, comprising at least one electrode (10) having a given surface extension (10A, 10B) and an oscillator circuit (15) 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 (10) from a counter electrode or frome earth is of the same or a substantially higher order of magnitude as seen in relation to the surface extension (10A, 10B) of the electrode (10). A conductor (11) connecting the electrode (10) to the oscillator circuit (15) has a length that is a small fraction as seen in relation to the surface extension (10A, 10B) of the electrode.
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