초록 ▼

A system for indicating the mass of fuel in several fuel tanks of an aircraft has a capacitive depth sensor and a permittivity cell located in each tank. Signals from the sensors and cells are supplied to a computing unit which computes the volume of fuel in each tank and its approximate density. Th

A system for indicating the mass of fuel in several fuel tanks of an aircraft has a capacitive depth sensor and a permittivity cell located in each tank. Signals from the sensors and cells are supplied to a computing unit which computes the volume of fuel in each tank and its approximate density. The system has a densitometer and another permittivity cell which receive a sample of all the fuel supplied to the tanks, and supply output signals to the computing unit. The computing unit derives a correction factor by comparing an approximate value of density derived from the other permittivity cell with a more accurate measure of density derived from the densitometer. The correction factor is used to correct the approximate values of density derived from the permittivity cell in each tank. A correction factor is calculated in respect of every batch of fuel supplied to the tanks and a combined correction factor is calculated for the mixture in each tank, from the volumes and respective correction factors of the constituent fuels.

대표청구항 ▼

A fluid-gauging system of the kind for providing a representation of the mass of fluid present in a plurality of reservoirs, the system including means for providing a representation of the volume of fluid present in each said reservoir, first means associated with each said reservoir for providing

A fluid-gauging system of the kind for providing a representation of the mass of fluid present in a plurality of reservoirs, the system including means for providing a representation of the volume of fluid present in each said reservoir, first means associated with each said reservoir for providing a first representation of the density of fluid in each said reservoir, and means for deriving the mass of fluid from said volume representations and said density representations, the improvement wherein the system includes second means for providing a second representation of the density of fluid, said second representation being more accurate than said first representation, and means for modifying each said first representation in accordance with said second representation so as thereby to obtain a more accurate representation of the density of fluid in each said reservoir.