Time Difference Measurement of Ultrasonic Pulses Using Cross-Correlation Function between Analytic Signals

Sugasawa, Shinobu

doi:10.1143/jjap.41.3299

Cited by 23 publications

(19 citation statements)

References 7 publications

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“…All pulse-echo approaches are limited by the quality of the echoes, 12,13 which is influenced by acoustic impedance and attenuation. These effects predominantly play a role in low density fluids, i.e., gases up to the critical region 14 and other highly attenuating liquids, 15,16 and impede the readability of the echoes.…”

Section: Limitations Of Pulse-echo Approachesmentioning

confidence: 99%

Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique

Dubberke

Baumhögger

Vrabec

2015

Review of Scientific Instruments

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The pulse-echo technique determines the propagation time of acoustic wave bursts in a fluid over a known propagation distance. It is limited by the signal quality of the received echoes of the acoustic wave bursts, which degrades with decreasing density of the fluid due to acoustic impedance and attenuation effects. Signal sampling is significantly improved in this work by burst design and signal processing such that a wider range of thermodynamic states can be investigated. Applying a Fourier transformation based digital filter on acoustic wave signals increases their signal-to-noise ratio and enhances their time and amplitude resolutions, improving the overall measurement accuracy. In addition, burst design leads to technical advantages for determining the propagation time due to the associated conditioning of the echo. It is shown that the according operation procedure enlarges the measuring range of the pulse-echo technique for supercritical argon and nitrogen at 300 K down to 5 MPa, where it was limited to around 20 MPa before.

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Section: Limitations Of Pulse-echo Approachesmentioning

confidence: 99%

Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique

Dubberke

Baumhögger

Vrabec

2015

Review of Scientific Instruments

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“…The time of flight of the ultrasonic pulses is evaluated by applying the cross-correlation method. 16 The computer program calculates time of flight between two selected impulses of the BG wave. If these two impulses take a similar shape but differ in amplitude, then the evaluated time interval between them is exact.…”

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confidence: 99%

New ultrasonic Bleustein-Gulyaev wave method for measuring the viscosity of liquids at high pressure

Kiełczyński

Szalewski

Siegoczyński

et al. 2008

Review of Scientific Instruments

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In this paper, a new method for measuring the viscosity of liquids at high pressure is presented. To this end the authors have applied an ultrasonic method using the Bleustein-Gulyaev (BG) surface acoustic wave. By applying the perturbation method, we can prove that the change in the complex propagation constant of the BG wave produced by the layer of liquid loading the waveguide surface is proportional to the shear mechanical impedance of the liquid. In the article, a measuring setup employing the BG wave for the purpose of measuring the viscosity of liquids at high pressure (up to 1 GPa) is presented. The results of high-pressure viscosity measurements of triolein and castor oil are also presented. In this paper the model of a Newtonian liquid was applied. Using this new method it is also possible to measure the viscosity of liquids during the phase transition and during the decompression process (hysteresis of the dependence of viscosity on pressure).

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“…1, the TOF between two selected ultrasonic impulses was calculated using the cross-correlation method (Sugasawa 2002). Since the cross-correlation function can be efficiently calculated using fast Fourier transform (FFT) algorithms, the TOF between two ultrasonic impulses in the experimental setup from Fig.…”

Section: Measurements Of the Speed Of Soundmentioning

confidence: 99%

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

Kiełczyński

Szalewski

Balcerzak

et al. 2016

Food Bioprocess Technol

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Modeling of high-pressure technological processes in the food industry requires knowledge of thermophysical parameters of processed foodstuffs in a broad range of pressures and temperatures. However, the high-pressure thermophysical parameters of foodstuffs are very rarely published in the literature. Therefore, further research is necessary to achieve a deeper insight into the biophysical and thermophysical phenomena under pressure to provide better control of technological processes and optimize the effects of pressure. The essential goal of this work is to evaluate the impact of high pressure and temperature on the thermophysical parameters of liquid foodstuffs on the example of diacylglycerol (DAG) oil (which attracted recently a considerable attention from research and industrial communities due to its remarkable benefits for health), using ultrasonic wave velocity and density measurements. Isotherms of adiabatic and isothermal compressibility, isobaric thermal expansion coefficient, internal pressure, and thermal pressure coefficient versus pressure were evaluated, based on the measurement of the compressional ultrasonic wave velocity and density of DAG oil at high pressures (up to 500 MPa) and at various temperatures. The adiabatic compressibility is affected mostly by the changes of pressure, i.e., it grows about four times when the pressure increases from the atmospheric pressure (0.1 MPa) to 400 MPa at a temperature of 50°C. By contrast, the internal pressure is a pronounced function of the temperature, i.e., it increases six times when the temperature rises from 20 to 50°C at a pressure of a 200 MPa. To perform numerical calculations, it was convenient to introduce a Tammann-Tait type equation of state to approximate the measured density isotherms of the investigated DAG oil. The results obtained in this paper can be applied in modeling and optimization of high-pressure technological processes and processing of foodstuffs. Evaluation of high-pressure isotherms of the considered thermophysical parameters of the DAG oil is an original authors' contribution to the state-ofthe-art.

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Time Difference Measurement of Ultrasonic Pulses Using Cross-Correlation Function between Analytic Signals

Cited by 23 publications

References 7 publications

Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique

Burst design and signal processing for the speed of sound measurement of fluids with the pulse-echo technique

New ultrasonic Bleustein-Gulyaev wave method for measuring the viscosity of liquids at high pressure

Evaluation of High-Pressure Thermophysical Parameters of the Diacylglycerol (DAG) Oil Using Ultrasonic Waves

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