An automatic measurement system using piezoelectric hydrophone for the three-dimensional ultrasound field distribution

Jiang, Zhan; Bai, Jing; Yu, Ying

doi:10.1109/spawda.2014.6998624

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Yu [4] presented a quantitative assessment method of acoustic intensity through measuring the acoustic pressure of the focused transducer with the hydrophone and estimating the temperature distribution of the focused transducer with the infrared camera. Jiang [5] measured the field distribution of ultrasound and key parameters of the focal region using an automatic measurement system based needle hydrophone. Kamimura [6] proposed a methodology to measure acoustic radiation force and small displacements using a transducer based on a magnetic sensor.…”

Section: Introductionmentioning

confidence: 99%

Measurement of focused ultrasonic fields based on colour edge detection and curve fitting

Zhu

Chang

2016

J. Inst.

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This paper utilizes firstly both a scanning device and an optic fiber hydrophone to establish a measurement system, and then proposes the parameter measurement of the focused transducer based on edge detection of the visualized acoustic data and curve fitting. The measurement system consists of a water tank with wedge absorber, stepper motors driver, system controller, a focused transducer, an optic fiber hydrophone and data processing software. On the basis of the visualized processing for the original scanned data, the −3 dB beam width of the focused transducer is calculated using the edge detection of the acoustic visualized image and circle fitting method by minimizing algebraic distance. Experiments on the visualized ultrasound data are implemented to verify the feasibility of the proposed method. The data obtained from the scanning device are utilized to reconstruct acoustic fields, and it is found that the −3 dB beam width of the focused transducer can be predicted accurately.

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Section: Introductionmentioning

confidence: 99%

Measurement of focused ultrasonic fields based on colour edge detection and curve fitting

Zhu

Chang

2016

J. Inst.

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Attenuation and dispersion of leaky Rayleigh wave in polycrystals

Shan

Song

2022

The Journal of the Acoustical Society of America

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In this work, we use the characteristic equation of leaky Rayleigh waves (LRWs) and a unified approach of bulk waves proposed by Stanke and Kino [J. Acoust. Soc. Am. 75, 665–681 (1984)] to calculate the attenuation and velocity dispersion of LRWs in polycrystals. Numerical results demonstrate that the total attenuation including the leakage attenuation and scattering attenuation is proportional to frequency and independent of grain size in the Rayleigh scattering regime. Meanwhile, the variation of phase velocity in all scattering regimes remains at ∼0.7% according to the theoretical expectation; this means that the velocity dispersion of the LRWs can be ignored, consistent with the conventional viewpoint. Measurements are conducted on stainless steel at different ultrasonic frequencies (all in the Rayleigh scattering regime). The non-paraxial sound field model is used here to eliminate the diffraction loss and to obtain the total attenuation. Experimental results verify that LRWs have very little velocity dispersion. Meanwhile, experimental fitting data reveal that the modified theoretical model can be used to evaluate the total attenuation (only ∼2% discrepancies) of LRWs under the consideration of the diffraction effect. The relative errors between experimental scattering attenuation and theoretical value ranged from 11% to 18%, mainly owing to the effect of surface roughness and measurement inaccuracy.

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An automatic measurement system using piezoelectric hydrophone for the three-dimensional ultrasound field distribution

Cited by 2 publications

References 6 publications

Measurement of focused ultrasonic fields based on colour edge detection and curve fitting

Measurement of focused ultrasonic fields based on colour edge detection and curve fitting

Attenuation and dispersion of leaky Rayleigh wave in polycrystals

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