Patent ID: 8781759

Claim:
Meter electronics ( 20 ) for processing sensor signals for a multi-phase flow material in a flowmeter ( 5 ), comprising: an interface ( 201 ) for receiving a first sensor signal ( 210 ) and a second sensor signal ( 211 ) for the multi-phase flow material; and a processing system ( 203 ) in communication with the interface ( 201 ) and configured to receive the first sensor signal ( 210 ) and the second sensor signal ( 211 ) from the interface ( 201 ), generate a first ninety degree phase shift ( 213 ) from the first sensor signal ( 210 ), compute a frequency ( 221 ) using the first ninety degree phase shift ( 213 ) and the first sensor signal ( 210 ), compute a phase difference ( 220 ) using the first ninety degree phase shift ( 213 ), the first sensor signal ( 210 ), and the second signal ( 211 ), break out the frequency ( 221 ) into at least a gas frequency component ( 1412 ) and a fluid frequency component ( 1416 ), determine one or more of a void fraction of gas ( 1418 ) or a liquid fraction ( 1427 ) from a frequency response ( 1410 ) and one or more of the gas frequency component ( 1412 ) and the fluid frequency component ( 1416 ), and compute one or more of a mass flow rate ( 223 ), a density ( 224 ), or a volume flow rate ( 225 ) for the multi-phase flow material.