초록 ▼

A tubular single-layer winding coil is installed on the outer periphery of a thin wall portion of a cylindrical container case and a columnar electrode is provided at the center of the inside of the cylindrical container case. A fuel channel is formed between the coil and the electrode so that the p

A tubular single-layer winding coil is installed on the outer periphery of a thin wall portion of a cylindrical container case and a columnar electrode is provided at the center of the inside of the cylindrical container case. A fuel channel is formed between the coil and the electrode so that the permittivity of fuel flowing through the fuel channel is detected from the electrostatic capacity therebetween. Further, variation of the electrostatic capacity due to the temperature characteristics of the fuel is compensated by the temperature characteristics of the permittivity of the thin wall portion of the sensor unit. Furthermore, variation of the electrostatic capacity due to the temperature characteristics of the fuel is compensated by the temperature compensation capacitor which is connected with the single layer winding coil in parallel.

대표청구항 ▼

An apparatus for detecting a permittivity of fuel, said apparatus comprising: single-layer winding coil means provided with a thin insulating layer having high-permittivity, said thin insulating layer being in contact with the fuel; metal electrode means, disposed concentrically with said single-lay

An apparatus for detecting a permittivity of fuel, said apparatus comprising: single-layer winding coil means provided with a thin insulating layer having high-permittivity, said thin insulating layer being in contact with the fuel; metal electrode means, disposed concentrically with said single-layer winding coil means and separated from said single-layer winding coil means by a predetermined distance, said metal electrode means defining a fuel channel with said thin insulating layer of said single-layer winding coil means; and means for detecting the permittivity of the fuel flowing through said fuel channel based on an electrostatic capacity between said single-layer winding coil means and said metal electrode means; wherein said single-layer winding coil means is formed in a tubular shape, and said metal electrode means is formed in a columnar shape.