Patent ID: 11906338
Assignee: HONEYWELL INTERNATIONAL INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A system for flow measurement, comprising:
a gas meter having a first transducer, a second transducer, and a flow channel between the first transducer and the second transducer, wherein:
an absolute-time-of-flight with respect to a flow of a fluid in the flow channel is calculated by reflected signals, reflected and unreflected signals, or a pulse train;
a delta-time-of-flight with respect to the flow of the fluid in the flow channel is determined with a cross correlation of two signals; and
a flow rate of the flow of the fluid in the flow channel is calculated based on the absolute-time-of-flight and the delta time-of-flight, wherein calculating the flow rate of the flow of the fluid in the flow channel comprises measuring the absolute-time-of flight of 3×length between the first transducer and the second transducer and subtracting the absolute-time-of-flight of 1×length between the first transducer and the second transducer, to eliminate the electrical and acoustic delays and wherein measuring the absolute-time-of-flight of 3L between the first transducer and the second transducer includes dividing 2×length (2L) between the first transducer and the second transducer by a first term ‘c+v’, and dividing 1×length between the first transducer and the second transducer by a second term ‘c−v’, and wherein the first term and the second term are based on a speed of sound and a medium velocity of the fluid in the flow channel.