Texas Instruments Corporation

Amardeep Sathyanarayana

Anand Ganesh Dabak

David Patrick Magee

Srinath Mathur Ramaswamy

Luis Fernando Reynoso

Venkataramanan Ramamurthy

R Venkata Ramanan

Sourabh Ravindran

Nitish Krishna Murthy

Leonard William Estevez

Brian Paul Burk

In an embodiment, a system for measuring material flow in a pipe is disclosed. A first transducer is operable to transmit a first signal having a first frequency at a first time and receive a second signal at a second time, and a second transducer spaced apart from the first transducer and is operable to receive the first signal and transmit the second signal having the first frequency. A signal processing circuit communicatively coupled to the first transducer and the second transducer, the signal processing circuit is operable to determine a first envelope of the first signal and a second envelope of the second signal and calculate a flow rate based on the first envelope of the first signal and the second envelope of the second signal.

Envelope based sample correction for digital flow metrology

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.

Ultrasonic transducer system and method using broadband system responses

A transducer system. The system comprises a transducer and circuitry for applying an excitation waveform to excite the transducer during an excitation period. The circuitry for applying has: (i) circuitry for applying a first waveform at a first frequency; and (ii) circuitry for applying a second waveform at a second frequency differing from the first frequency.

Ultrasonic transducer system and method for bi-modal system responses

In circuitry for applying a pulse train to excite a transducer, the circuitry selects a first set having a first number of pulses at a first frequency and a second set of pulses having a second number of pulses at a second frequency differing from the first frequency. At least one pulse from the first set is located in the pulse train between one or more of the pulses at the second frequency.

Ultrasonic transducer system and method using selective interleaved excitation pulse frequency

A method, system and apparatus is disclosed for auto-tuning a circuit associated with an upstream transducer (UPT) and a circuit associated with a downstream transducer (DNT) for reciprocal operation in an ultrasonic flowmeter. The method includes exchanging signals between the upstream transducer and the downstream transducer; comparing at least one of respective maximum amplitudes of an upstream signal and a downstream signal and respective center frequencies of a Fast Fourier Transform (FFT) of the upstream signal and the downstream signal; and responsive to determining that at least one of the respective maximum amplitudes and the respective center frequencies do not match, correcting the mismatch.

Ultrasonic flow meter auto-tuning for reciprocal operation of the meter

Mechanical vibration may be sensed by a remotely located ultrasonic sensor. An ultrasonic wave may be transmitted from a transmitter to a vibrating surface, in which the transmitter is separated from the vibrating surface by a distance. A reflected portion of the ultrasonic wave that is reflected from the vibrating surface may be received by a receiver that is also separated from the vibrating surface by a distance. A measure of phase shift amplitude in the reflected portion of the ultrasonic wave may be determined and converted into an amplitude of a vibration of the vibrating surface.

Ultrasonic vibration sensing

A transducer system with a transducer and circuitry for applying a pulse train to excite the transducer. The circuitry for applying a pulse train selects a first set having a first number of pulses at a first frequency and a second set of pulses having a second number of pulses at a second frequency differing from the first frequency. At least one pulse from the first set is located in the pulse train between one or more of the pulses at the second frequency.

A method of ultrasound flow metering includes applying a first and second pulse train to an ultrasound transducer pair (T, T) positioned for coupling ultrasonic waves therebetween. Responsive to the first pulse train applied to T, Ttransmits an ultrasonic wave received as received ultrasonic wave (R) by Tafter propagating through fluid in a pipe. Responsive to the second pulse train applied to T, Ttransmits an ultrasonic wave received as received ultrasonic wave by (R) Tafter propagating through the fluid. During the pulse trains, Rand Rbuild up in amplitude to provide excitation portions. The pulse trains are terminated, so that Rand Rdecay as a damped free oscillation. Windowing is applied to Rand Rto generate windowed portions. A signal delay between tand t(&#x394;TOF) is calculated using only windowed portions, and a fluid flow is calculated from the &#x394;TOF.

Ultrasonic flowmeter using windowing of received signals

A method and apparatus for determining properties of at least one of a surface or materials adjacent to a portable device. The method includes windowing a segment of the received signal to remove an edge transients, computing the FFT power spectral density of the signal, determining a peak in the spectral energy at a frequency, finding local peaks by determining the difference in the signal amplitude is relation to a pre-determined threshold, and computing harmonic energy according to the local peaks and the difference and determining at least one property of the surface or material.

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Austin, TX, United States of America

Amardeep Sathyanarayana