| 摘要 |
Apparatus, for determining water saturation of a fluid in a core sample or flowing in a pipe, includes a sensor spacially arranged with the pipe or the core sample providing a signal whose frequency and amplitude corresponds to the water saturation. A circuit connected to the sensing means provides a difference signal corresponding to the voltage difference between the signal from the sensor and a reference level established for the signal from the sensor corresponding to substantially 100% water saturation. A local oscillator provides a local signal whose frequency corresponds to a substantially 100% water saturation condition. A mixer connected to the sensor and to the local oscillator provides a signal having a frequency that corresponds to the difference between the frequencies of the signals from the sensor and the local oscillator. A frequency to voltage converter connected to the mixer provides a signal whose amplitude corresponds to the frequency of the mixer's signal. A network provides a signal corresponding to the water saturation in accordance with the signals from the circuit and the converter.
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