"Ultrasound Fuel Flow Sensing And Control"

Abstract: Methods and apparatus for measuring liquid fuel flows within a conduit (104) are disclosed. An example flow sensor (101) may include a conduit (104) arranged to flow fuel therethrough along a flow axis (154) the conduit (104) defining a flow area orthogonal to the flow axis (154). The flow sensor (101) may further include a first transducer (102) arranged to direct a first signal through the conduit (104) proximate the flow area (152) to a second transducer (114) the second transducer (114) being arranged to direct a second signal through the conduit (104) proximate the flow area (152) to the first transducer (102) the first transducer (102) being spaced apart from the second transducer (114) by a signal path length (112) and in a direction parallel to the flow axis (154) by an axial distance. The fuel flow measuring system (100) may further include a processor (180) arranged to calculate a fuel mass flow rate (170) based on first and second signal transit times (122 118) known fuel properties and a fuel temperature (150).

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