Method and system for fluid flow rate measurement

A method of measuring fluid flow parameters of fluids flowing through lumens, the method comprising:

• transmitting through a fluid flowing through a lumen, by a first transducer of a sensor secured to a structure defining the lumen, a plurality of transmit (TX) signals, each of the plurality of TX signals transmitted with a respective time delay from a clock signal of an analog-to-digital converter;
• receiving, by a second transducer of the sensor, a plurality of receive (RX) signals, each one corresponding to a respective one of the plurality of transmitted TX signals;
• sampling, by the analog-to-digital converter, at a first sampling rate, the plurality of RX signals received by the second transducer;
• generating, by a processor, a fine resolution signal using sampled versions of the plurality of RX signals generated by the analog-to-digital converter, the fine resolution signal associated with a second sampling rate higher than the first sampling rate;
• computing, by the processor, a cross-correlation signal indicative of cross-correlation between the fine resolution signal and a reference waveform;
• and
• determining, by the processor, an estimate of a fluid flow parameter of the fluid based on the computed cross-correlation signal.