| 摘要 |
A sensor ( 20 ) includes a single capacitor ( 30 ) that operates in two different modes to obtain capacitance and conductance information when a mixture flows between the electrodes ( 32, 34 ) of the capacitor. Two different oscillators ( 180, 182 ) are selectively used to obtain the conductance and capacitance information. In a disclosed embodiment, a capacitor includes an outer electrode ( 32 ) that is received around an inner electrode ( 34 ) such that there is spacing between the electrodes through which the mixture flows. The mixture acts as a dielectric of the capacitor allowing the conductance and capacitance measurements to be made. A glass member ( 36 ) seals off the spacing between the electrodes and provides physical support to position the inner electrode to keep the electrodes electrically isolated.
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