Modified treatment of ultrasonic pulse-echo immersion technique

Youssef, Moheb H.; Gobran, N. K.

doi:10.1016/s0041-624x(01)00085-3

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…The method introduced by Youssef and Gobran [ 17 ], follows a different approach from the variable thickness technique. The main difference is that measurements are performed using reflected echoes at a single transducer ( T ) working in transmit and receive mode (Fig.…”

Section: Methodsmentioning

confidence: 99%

Acoustic and thermal characterization of agar based phantoms used for evaluating focused ultrasound exposures

Menikou

Damianou

2017

J Ther Ultrasound

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BackgroundThis study describes a series of experimental work completed towards characterizing candidate materials for fabricating brain and muscle tissue mimicking phantoms.MethodsThe acoustic speed, attenuation, impedance, thermal diffusivity, specific heat and thermal conductivity were measured.ResultsThe resulting brain (2% w/v agar-1.2% w/v Silica Dioxide-25%v/v evaporated milk) and muscle tissue recipe (2% w/v agar-2% w/v Silica Dioxide-40%v/v evaporated milk) introduced a total attenuation coefficient of 0.59 dB/cm-MHz and 0.99 dB/cm-MHz respectively. Acrylonitrile Butadiene Styrene (ABS) possessed an attenuation coefficient of 16 dB/cm at 1 MHz which was found within the very wide range of attenuation coefficient values of human bones in literature. The thermal conductivity of the brain tissue phantom was estimated at 0.52 W/m°C and at 0.57 W/m.°Cfor the muscle. These values demonstrated that the proposed recipes conducted heat similar to the majority of most soft tissues found from bibliography. The soft tissue phantoms were also evaluated for their thermal repeatability after treating them repeatedly at different locations with the same sonication protocol and configuration. The average coefficient of variation of the maximum temperature at focus between the different locations was 2.6% for the brain phantom and 2.8% for the muscle phantom.ConclusionsThe proposed phantom closely matched the acoustic and thermal properties of tissues. Experiments using MR thermometry demonstrated the usefulness of this phantom to evaluate ultrasonic exposures.

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Section: Methodsmentioning

confidence: 99%

Acoustic and thermal characterization of agar based phantoms used for evaluating focused ultrasound exposures

Menikou

Damianou

2017

J Ther Ultrasound

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“…(7) leads to the system of two equations [16][17][18][19] and extends expression presented in [16] to the multi-layered case:…”

Section: Estimation Of the Attenuation And Phase Velocity Dispersion mentioning

confidence: 86%

“…2), m ¼ 0.115, a 0,k is the attenuation coefficient at the frequency f 0,k , n k is a power of the attenuation slope, x k is the thickness of an individual layer, k is a number of the particular layer, N is a number of layers in the structure, m is the unit conversion coefficient from dB to Np. Here K k ¼ 1/K 0,k , K 0,k is the reflectivity coefficient [16][17][18]. The received ultrasonic signals have been selected using rectangularly shaped window, which has been symmetrical to the maximum amplitude of the signals.…”

Section: Estimation Of the Attenuation And Phase Velocity Dispersion mentioning

confidence: 99%

“…7. Waveform of the reflected signal u i (t) from the ith interface is given by : u i ðtÞ ¼ IFTðK 0;k FTðu iÀ1 ðtÞÞe À2mx w;k a R;k ðf =f R;k Þ n k Àj4px w;k ðf =v p;k ðf ÞÞ Þ; (18) where FT and IFT denote the direct and inverse Fourier transform, respectively, K 0,k is the reflectivity coefficient, u iÀ1 (t) is the signal reflected from the front surface of the kth layer (interface iÀ1), and has been used as a reference, performing analysis of the back-surface reflection u i (t) from the kth layer (interface i), m is the conversion coefficient from dB to Np (m ¼ 0.115), a R,k is the attenuation coefficient at the reference frequency f R,k , n k is the power of the attenuation slope, x w,k is the wall thickness of the individual kth layer, v p,k (f) is the phase velocity dispersion. For the ith interface between adjacent layers, the reflectivity coefficient K 0,k is given by…”

Section: Prediction Of the Reflected Signals From The Interfaces Betwmentioning

confidence: 99%

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Application of the ultrasonic pulse-echo technique for quality control of the multi-layered plastic materials

Raišutis

Kažys

Mažeika

2008

NDT & E International

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“…The over ow part was mainly composed of the over ow box and seal block, it was applied to adjust the depth of coupling agent between probe and workpiece as well as leading the out ow of excess coupling agent [23]. The over ow type of partial immersion was adopted in this work to form an acoustic coupling between the measured workpiece and over ow surface.…”

Section: Over Owmentioning

confidence: 99%

A Precision Grinding Technology for Zirconium Alloy Tubes Based on Ultrasonic Wall Thickness Automatic Measurement System

Lai

Wang

et al. 2021

Preprint

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To ensure the safety and long-term performance of nuclear fuel cladding zirconium tubes, the wall thickness uniformity of each cross section is strictly needed. Therefore, this paper presents comprehensive investigations on development of an automatic ultrasonic wall thickness measurement system for detecting the nuclear zirconium tubes. Based on the determination of overall scheme, optimization of key mechanical structures and design of control system, a series of performance testing analyses of this developed auto-measuring system were performed from aspects of measuring accuracy, measuring efficiency, stability and practicability. The results revealed that it could accurately obtain the wall thickness distribution and effectively guide the subsequent grinding process by automatically generated deviation correcting procedures to achieve the requirement of the wall thickness uniformity. The new combination method of ultrasonic auto-measuring and numerical control grinding proposed in this work would have a great significance for the development and application of nuclear reaction zirconium alloy container.

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Modified treatment of ultrasonic pulse-echo immersion technique

Cited by 15 publications

References 8 publications

Acoustic and thermal characterization of agar based phantoms used for evaluating focused ultrasound exposures

Acoustic and thermal characterization of agar based phantoms used for evaluating focused ultrasound exposures

Application of the ultrasonic pulse-echo technique for quality control of the multi-layered plastic materials

A Precision Grinding Technology for Zirconium Alloy Tubes Based on Ultrasonic Wall Thickness Automatic Measurement System

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