ON-BOARD AIRCRAFT FUEL MEASUREMENT SYSTEM Russian patent published in 2010 - IPC B64D37/00 G01F23/00 G01F23/26 

FIELD: air transport.

SUBSTANCE: system contains fuel level sensors (3) installed in fuel tank; the first and second measurement units of fuel volume (5 and 6); calculation unit of fuel weight (4) and device for spatial attitude definition of free fuel surface (9); measurement unit of fuel density (8) and fuel density comparator (7). Besides the system includes multisensor (2) of fuel parametres installed in fuel sensor; dielectric permittivity sensor (10) and sensor of ultrasound speed in fuel (11). Fuel level sensor represents electric capacity sensor combined with ultrasonic level sensor. Electric capacity sensor is made as coaxial cylindrical capacitor with internal and external electrodes; ultrasonic fuel level sensor is made as tubular acoustic waveguide. At the same time in lower part of this waveguide there is piezoelectric transducer and inside there is float reflector electrode able to move freely in longitudinal direction. At the same time internal electrode of electric capacity sensor is used as the above tubular acoustic waveguide.

EFFECT: measurement error reduction for fuel weight.

2 dwg