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US 2020/0400472 A1Published application
Extended range adc flow meter
AssigneeTexas Instruments Incorporated
InventorsAnand Dabak, Venkata Ramanan
Life of this patent
Estimating the term…
Abstract
A method of calculating a time difference is disclosed. The method includes sampling a first ultrasonic signal (r21) to produce a first sampled signal (y1(i)) and sampling a second ultrasonic signal (r12) to produce a second sampled signal (y2(i)). A first time (LEAD_LAG) is determined between a time the first sampled signal crosses a threshold (θ1) and a time the second sampled signal crosses the threshold. The first sampled signal is cross correlated with the second sampled signal to produce a second time (SAMP_OFFSET). The time difference is calculated in response to the first and second times.
Claims15
A method comprising:
- receiving, at an ultrasonic measurement circuit, a first ultrasonic signal from a first transducer through a material;
- receiving, at the ultrasonic measurement circuit, a second ultrasonic signal from a second transducer through the material;
- sampling, by the ultrasonic measurement circuit, the first ultrasonic signal to produce a first sampled signal;
- determining, by the ultrasonic measurement circuit, a first envelope of the first sampled signal;
- sampling, by the ultrasonic measurement circuit, the second ultrasonic signal to produce a second sampled signal;
- determining, by the ultrasonic measurement circuit, a second envelope of the second sampled signal;
- determining, by the ultrasonic measurement circuit, a first time between the first envelope crossing a threshold and the second envelope crossing the threshold;
- determining, by the ultrasonic measurement circuit, an in-phase signal from the first ultrasonic signal;
- determining, by the ultrasonic measurement circuit, a quadrature signal from the second ultrasonic signal;
- determining, by the ultrasonic measurement circuit, a second time between the first and second sampled signals using the in-phase signal and the quadrature signal;
- and
- determining, by the ultrasonic measurement circuit, a velocity of the material based in part on an angle from the first transducer and the second transducer to a pipe wall, distance between the first transducer and the second transducer, the first time, and the second time.
9 more elements
A method comprising:
- receiving, at an ultrasonic measurement circuit, a first ultrasonic signal from a first transducer through a material;
- receiving, at the ultrasonic measurement circuit, a second ultrasonic signal from a second transducer through the material;
- sampling, by the ultrasonic measurement circuit, the first ultrasonic signal to produce a first sampled signal;
- determining, by the ultrasonic measurement circuit, a first envelope of the first sampled signal;
- sampling, by the ultrasonic measurement circuit, the second ultrasonic signal to produce a second sampled signal;
- determining, by the ultrasonic measurement circuit, a second envelope of the second sampled signal;
- determining, by the ultrasonic measurement circuit, a first time between the first envelope crossing a threshold and the second envelope crossing the threshold;
- determining, by the ultrasonic measurement circuit, an in-phase signal from the first ultrasonic signal;
- determining, by the ultrasonic measurement circuit, a quadrature signal from the second ultrasonic signal;
- determining, by the ultrasonic measurement circuit, a second time between the first sampled signal and the second sampled signal using the in-phase signal and the quadrature signal;
- and
- determining, by the ultrasonic measurement circuit, a velocity of the material based in part on an angle from the first transducer and the second transducer to a pipe wall, distance between the first transducer and the second transducer, and the first time and the second time.
9 more elements
A system comprising:
- a first transducer arranged to transmit a first signal having a first frequency at a first time and receive a second signal at a second time;
- a second transducer spaced apart from the first transducer and arranged to receive the first signal and transmit the second signal having the first frequency;
- an analog-to-digital converter (ADC), coupled to the first transducer and the second transducer, to:
- receive, from the first transducer, a second signal through a material;
- receive, from the second transducer, a first signal through the material;
- sample the received first signal at a second frequency to produce a first sampled signal;
- and
- sample the received second signal at the second frequency to produce a second sampled signal;
- and
- a processing circuit to:
- determine a first envelope of the first sampled signal;
- determine a second envelope of the second sampled signal;
- determine a first time between the first envelope crossing a threshold and the second envelope crossing the threshold;
- determine an in-phase signal from the first ultrasonic signal;
- determine a quadrature signal from the second ultrasonic signal;
- determine a second time between the first and second envelopes using the in-phase signal and the quadrature signal;
- and
- determine a velocity of the material based in part on an angle from the first transducer and the second transducer to a pipe wall, distance between the first transducer and the second transducer, the first time, and the second time.
15 more elements
Dependencies are inferred from the claim text.