| 摘要 |
<p>A ceramic bodied sensor having helical metallized electrodes for measuring the capacitance of an oil-water-gas or oil-water mixture flowing through a central bore of the sensor is disclosed. The sensor is a hollow cylinder with a thin inner ceramic layer (13), a thicker outer ceramic layer (14) which forms a strong structural unit, and a pair of isolated metallized electrodes (15, 16) which are located between the inner and outer layers. The inner layer (13), outer layer (14) and electrodes (15, 16) form a dense monolithic ceramic tube. The electrode plates are identical in size and shape and are isolated from one another. The inner ceramic layer (13) is very thin to minimize its capacitance value in comparison to the capacitance value of the water-oil-gas or oil-water mixture. The sensor measures changes in the capacitance with changes in composition of the oil-water or oil-water-gas concentrations.</p> |
