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

Claim 0:
1. A method for flow measurement in a flow channel associated with a first transducer and a second transducer, the method, comprising:
calculating an absolute-time-of-flight with respect to a flow of a fluid in the flow channel by reflected signals, reflected and unreflected signals, or a pulse train;
determining a delta-time-of-flight with a cross correlation of two signals with respect to the flow of the fluid in the flow channel; and
calculating a flow rate of the flow of the fluid in the flow channel 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 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.