| 摘要 |
Dynamic monitoring of the amount of fuel remaining in an aircraft fuel tank is effected by delivering a constant volume flow of an inert gas into the fuel through the respective open distal ends of a sensor conduit tube and a reference conduit tube, each of which extends from a proximal end exterior of the tank to its respective distal open end located within the fuel tank. The sensor conduit tube distal end is fixed closely proximate the bottom of the tank, and the reference conduit tube distal end is fixed proximate but at a vertical spacing h from the sensor conduit tube distal end. The pressure at which the gas is delivered into the fuel at the constant volumetric rate through each of the sensor and reference conduit tubes is monitored. The pressure difference between the monitored pressure in the sensor conduit tube and the pressure in the free space in the fuel tank above the surface of the remaining fuel is directly proportional to the weight of the fuel lying above the sensor conduit tube distal end. The density of the fuel is proportional to the monitored pressure difference between the sensor and reference conduit tubes, divided by the vertical spacing h. The calculated weight of the fuel, divided by the calculated density of the fuel, is proportional to the volume of the fuel remaining in the tank.
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