Ultrasonic focusing and scanning with multiple waves

Zhang, Bixing; Liu, Dongdong; Dong, Hefeng

doi:10.1088/1674-1056/22/1/014302

Cited by 15 publications

(11 citation statements)

References 16 publications

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“…[10][11][12][13][14][15] However, a number of recent studies illustrate the unique excitation and propagation mechanism of SV waves, which makes it possible to achieve beam focusing of SV waves with a contact-type transducer array. [20,[23][24][25] For instance, Drinkwater et al [20] pointed out that the SV waves with higher ampli-tude over p-waves could be generated by a contact-type transducer array in some special cases. Noroy et al [24] improved the ultrasonic field generated by a laser array with the shear wave focusing technology.…”

Section: Introductionmentioning

confidence: 99%

“…Noroy et al [24] improved the ultrasonic field generated by a laser array with the shear wave focusing technology. More recently, Zhang et al [25] proposed the concept of ultrasonic focusing technology with multiple waves, whereas more in-depth analyses have not been given. Obviously, it is profoundly meaningful to study the beam focusing behavior of SV waves for a contact-type linear phased array.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic beam focusing characteristics of shear-vertical waves for contact-type linear phased array in solid*

Dai¹,

Yan²,

Zhang³

2020

Chinese Phys. B

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We investigate the beam focusing technology of shear-vertical (SV) waves for a contact-type linear phased array to overcome the shortcomings of conventional wedge transducer arrays. The numerical simulation reveals the transient excitation and propagation characteristics of SV waves. It is found that the element size plays an important role in determining the transient radiation directivity of SV waves. The transient beam focusing characteristics of SV waves for various array parameters are deeply studied. It is particularly interesting to see that smaller element width will provide the focused beam of SV waves with higher quality, while larger element width may result in erratic fluctuation of focusing energy around the focal point. There exists a specific range of inter-element spacing for optimum focusing performance. Moreover, good beam focusing performance of SV waves can be achieved only at high steering angles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic beam focusing characteristics of shear-vertical waves for contact-type linear phased array in solid*

Dai¹,

Yan²,

Zhang³

2020

Chinese Phys. B

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“…[1] Quantitative ultrasound (QUS) has been used as a promising and non-invasive tool for bone assessment. [5][6][7][8][9][10][11][12][13][14][15] The ultrasonic through-transmission measurements of calcaneus bones were widely used to predict the fracture risk in the clinic. [16][17][18] Recently, ultrasonic backscatter has attracted attention and has shown potential for cancellous bone evaluation.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic backscatter characterization of cancellous bone using a general Nakagami statistical model

Liu

Dong

et al. 2019

Chinese Phys. B

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The goal of this study is to analyze the statistics of the backscatter signal from bovine cancellous bone using a Nakagami model and to evaluate the feasibility of Nakagami-model parameters for cancellous bone characterization. Ultrasonic backscatter measurements were performed on 24 bovine cancellous bone specimens in vitro and the backscatter signals were compensated for the frequency-dependent attenuation prior to the envelope detection. The statistics of the backscatter envelope were modeled using the Nakagami distribution. Our results reveal that the backscatter envelope mainly followed pre-Rayleigh distributions, and the deviations of the backscatter envelope from Rayleigh distribution decreased with increasing bone density. The Nakagami shape parameter (i.e., m) was significantly correlated with bone densities (R = 0.78-0.81, p < 0.001) and trabecular microstructures (|R| = 0.46-0.78, p < 0.05). The scale parameter (i.e., Ω ) and signal-to-noise ratio (SNR) also yielded significant correlations with bone density and structural features. Multiple linear regressions showed that bone volume fraction (BV/TV) was the main predictor of the Nakagami parameters, and microstructure produced significantly independent contribution to the prediction of Nakagami distribution parameters, explaining an additional 10.2% of the variance at most. The in vitro study showed that statistical parameters derived with Nakagami model might be useful for cancellous bone characterization, and statistical analysis has potential for ultrasonic backscatter bone evaluation.

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“…Fish scaling is the most terrible defect for low carbon steel sheets for enameling [2]. The cause of fish scaling is hydrogen which generated in steel sheet during acid pickling and enameling process [3]. Ability of fish-scaling resistance directly depends on hydrogen storage capacity of steel sheet.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Fish-scaling Resistance of Low Carbon Non-microalloyed and Boron-microalloyed Steels for Enameling

Liu¹,

Zhang²,

Dai³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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Abstract. TH values of low carbon non-microalloyed and boron-microalloyed steels before and after baking were measured and microstructures of low carbon non-microalloyed and boron-microalloyed steels before and after baking were observed by scanning electron microscope as well as transmission electron microscope in order to study fish-scaling resistance of steels for enameling. Results show that cementite is the important hydrogen storage trap in low carbon steels and cementite at ferrite grain boundary is the most important hydrogen storage trap. TH value of non-microalloyed steels before baking is highest because all cementites distribute along ferrite grain boundaries. TH value of non-microalloyed steels after baking decreases due to a decrease in cementite-ferrite interfaces when cementites grow up. TH value of boron-microalloyed steels before baking is lowest because most cementites disperse in ferrite grains. TH value of boron-microalloyed steels after baking increases because cementites in ferrite grains are pushed to ferrite grain boundaries by migratory grain boundaries when ferrite grains grow up.

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Ultrasonic focusing and scanning with multiple waves

Abstract: Ultrasonic focusing and scanning with multiple waves * Zhang Bi-Xing(Ü+() a) † , Liu Dong-Dong(4ÁÁ) a) , Shi Fang-Fang("••) a) , and Hefeng Dong b) a) State

Cited by 15 publications

References 16 publications

Ultrasonic beam focusing characteristics of shear-vertical waves for contact-type linear phased array in solid*

Ultrasonic beam focusing characteristics of shear-vertical waves for contact-type linear phased array in solid*

Ultrasonic backscatter characterization of cancellous bone using a general Nakagami statistical model

A Comparative Study of Fish-scaling Resistance of Low Carbon Non-microalloyed and Boron-microalloyed Steels for Enameling

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