Method and system for fluid flow rate measurement
First Claim
1. A fluid flow meter system comprising:
- a sensor, secured to a structure defining a lumen, the sensor including;
(i) a first transducer configured to transmit through a fluid flowing through 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;
(ii) a second transducer to receive a plurality of receive (RX) signals, each RX signal corresponding to a respective TX signal of the plurality of TX signals;
the analog-to-digital converter configured to sample, at a first sampling rate, the plurality of RX signals received by the second transducer; and
a processor configured to;
generate a fine resolution signal using sampled versions of the 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;
compute a cross-correlation signal indicative of cross-correlation between the fine resolution signal and a reference waveform; and
determine an estimate of a fluid flow parameter of the fluid based on the computed cross-correlation signal.
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Accused Products
Abstract
A fluid flow meter system for monitoring fluid flow through a lumen includes a first ultrasonic transducer configured to transmit one or more versions of a transmit (TX) signal through a fluid flowing within the lumen, and a second ultrasonic transducer configured to receive one or more respective receive (RX) signals. The fluid flow meter system includes an analog-to-digital converter (ADC) configured to sample, at a first frequency, the one or more RX ultrasonic signals and a processor configured to generate a fine resolution signal based on the one or more RX ultrasonic signals. The fine resolution signal is associated with a second sampling rate higher than the first sampling rate. The processor is also configured to compute a cross-correlation signal indicative of cross-correlation between the fine resolution signal and a waveform and determine an estimated fluid flow parameter based on the computed cross-correlation signal.
16 Citations
23 Claims
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1. A fluid flow meter system comprising:
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a sensor, secured to a structure defining a lumen, the sensor including; (i) a first transducer configured to transmit through a fluid flowing through 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; (ii) a second transducer to receive a plurality of receive (RX) signals, each RX signal corresponding to a respective TX signal of the plurality of TX signals; the analog-to-digital converter configured to sample, at a first sampling rate, the plurality of RX signals received by the second transducer; and a processor configured to; generate a fine resolution signal using sampled versions of the 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; compute a cross-correlation signal indicative of cross-correlation between the fine resolution signal and a reference waveform; and determine an estimate of a fluid flow parameter of the fluid based on the computed cross-correlation signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification