The basic principle of a capacitance fuel gauge system is that the…
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A
capacitance of a capacitor depends on the nature of the dielectric in which it is immersed.
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B
electromotive force of a capacitor depends on the nature of the dielectric in which it is immersed.
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C
capacitance of a capacitor only depends on the density of the liquid on which it is immersed.
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D
internal resistance of a capacitor depends on the nature of the dielectric in which it is immersed.
Refer to figure.
A capacitor consists of two electrically charged plates of the same size, located at a fixed distance from each other. Fuel and air are the dielectrics, so the capacitance between the two plates varies depending on the amount of fuel and air found between the plates. Capacitance is based on the following formula:
Capacitance = E x A/D
E = dielectric permittivity
D = distance between capacitor’s plates
A = area of the plates
As you can see, only one of these items is variable: the dielectric permittivity. To put it simple, the dielectric permittivity is a parameter that measures how well an electric field will interact with any given material. Fuel has approximately twice the capacitance of the air, so the current sensed between the capacitor’s plates is going to be proportional to the level of fuel in the tanks.
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