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US 12,038,314 B2Granted
Ultrasonic transducer system and method using broadband system responses
AssigneeTexas Instruments Incorporated
InventorsAmardeep Sathyanarayana, David P. Magee, Anand G. Dabak, Srinath M. Ramaswamy
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Abstract
A transducer system with a transducer and circuitry for applying a waveform to excite the transducer during an excitation period. The applying circuitry also comprises circuitry for changing a frequency of the waveform during the excitation period.
Claims22
A method comprising:
- applying a first excitation waveform during a first excitation period, the first excitation waveform comprising a plurality of periodic cycles with changing frequency to excite a first transducer;
- receiving a first echo waveform in response to the excitation of the first transducer;
- performing a first correlation between the first echo waveform and a reference waveform to determine a first correlation result, wherein performing the first correlation comprises evaluating a first number of time slots;
- determining a first absolute time of flight between the first excitation waveform and the first echo waveform based on the first correlation;
- applying a second excitation waveform during a second excitation period, the second excitation waveform comprising a plurality of periodic cycles with changing frequency;
- receiving a second echo waveform after applying the second excitation waveform;
- performing a second correlation between the second echo waveform and the reference waveform to determine a second correlation result, wherein performing the second correlation comprises evaluating a second number of time slots that is smaller than the first number of time slots;
- and
- determining a second absolute time of flight between the second excitation waveform and the second echo waveform based on the second correlation.
6 more elements
A method comprising:
- applying a first pulse train comprising a first plurality of sets of pulses to excite a first transducer, changing a respective frequency for each set of pulses in the first plurality of sets;
- receiving a first echo waveform from a second transducer in response to the excitation of the first transducer;
- determining a first absolute time of flight based on the first pulse train and the first echo waveform;
- applying a second pulse train comprising a second plurality of sets of pulses to excite the second transducer;
- determining a second absolute time of flight based on the second pulse train and the second received echo waveform;
- and
- determining a relative time of flight between the first received echo waveform and the second received echo waveform.
4 more elements
A method comprising:
- applying a first excitation waveform during a first excitation period, the first excitation waveform comprising a plurality of periodic cycles with changing frequency to excite a first transducer;
- receiving a first echo waveform in response to the excitation of the first transducer;
- and
- determining a first absolute time of flight between the first excitation waveform and the first echo waveform;
- and
- adjusting a transmission parameter in response to a peak to side lobe measure.
3 more elements
A method, comprising:
- determining a nominal resonance frequency value;
- determining a bandwidth value;
- determining a set of frequencies within the bandwidth value around the nominal resonance frequency value;
- and
- for each frequency of the set of frequencies, exciting a first ultrasound transducer by applying a respective pulse train having the respective frequency;
- receiving a first set of reflections in response to the excitation of the first ultrasound transducer;
- performing a first correlation between the first set of reflections and a reference waveform to determine a first correlation result, wherein performing the first correlation comprises evaluating a first number of time slots;
- for each frequency of the set of frequencies, exciting a second ultrasound transducer by applying a respective pulse train having the respective frequency;
- receiving a second set of reflections in response to the excitation of the second ultrasound transducer;
- performing a second correlation between the second set of reflections and the reference waveform to determine a second correlation result, wherein performing the second correlation comprises evaluating a second number of time slots that is smaller than the first number of time slots;
- and
- determining a distance measurement based on the first set of reflections the second set of reflections, the first correlation result, and the second correlation result.
9 more elements
Dependencies are inferred from the claim text.