Sensitivity Enhancement of Concurrent Technique of Acoustic Impedance Measurement

Joshi, Deepa; Kumar, Ashok; Gupta, Ruby; Yadav, Sanjay

doi:10.1007/s12647-013-0051-3

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…Baker [29] used the shear wave to evaluate the viscoelasticity of the liquid by the SRM at an early stage. In addition, Morozov, Joshi and Kumar et al [30,31] used the longitudinal wave to study the complex acoustic impedance measurement. The accuracy is improved by standardizing the measured values of the samples based on the reflectance of the air and the buffer material.…”

Section: Srm Theorymentioning

confidence: 99%

Study on the Viscoelasticity Measurement of Materials Based on Surface Reflected Waves

Chang

Zeng

et al. 2019

Materials

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The reflected waves received from ultrasonic waves propagating in materials contain information that constitutes the physical properties, material composition, defects, and degradation states. When measuring the dynamic viscoelasticity, the traditional bottom reflection method (BRM) cannot be used to measure the bottom irregular samples. In this paper, the storage modulus, loss modulus, and loss tangent are extracted by the surface reflection method (SRM) to evaluate the elastomer sample viscoelasticity. A theoretical study on the phase change caused by multiple reflections in the case of non-thin layer coupling is conducted. Based on this research, the experimental system is built. The results show that considering the thickness of the coupling layer can optimize the determination of viscoelasticity and reduce the error of the viscoelastic evaluation results of an elastomer with the traditional BRM. Finally, based on the principle of the SRM, the density of the elastomers is measured, and the feasibility and overall efficiency of this method are verified by experiments.

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Section: Srm Theorymentioning

confidence: 99%

Study on the Viscoelasticity Measurement of Materials Based on Surface Reflected Waves

Chang

Zeng

et al. 2019

Materials

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“…The tank position is measured with the help of industrial laser displacement sensor (Panasonic model: HL-G112-A-C5) with resolution of 8 lm. 3 Transducer excitation signal is generated with a programmable function generator (Agilent model: 33250A). For higher amplitude excitation E&I power amplifier is used.…”

Section: Improved Automated Radiation Force Balance Setupmentioning

confidence: 99%

“…Applications of ultrasound have been tremendously increased in last few decades in medical as well as industries [1][2][3][4][5][6]. This is particularly due to its advantages over other testing methods [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Improved and Automated Primary Ultrasonic Power Measurement Setup at CSIR-NPL, India

Dubey

Jain

Singh

2015

MAPAN

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Ultrasonic power generated by an ultrasonic transducer must be measured and declared for the ultimate safety of patients. According to IEC-61161 radiation force balance is internationally recommended primary method for measurement of total, time averaged ultrasonic power radiated by transducer. In a manual RFB system, the output of microbalance is recorded manually at no radiation force and after transducer excitation. Manual technique suffers from various errors, such as overshoot due to momentum of target, disturbance due to small tilt in target and buoyancy change of target. The developed automated system provides scope to visualize these effects and enables us to considerably reduce effects of above sources and hence improves uncertainty. In this article developmental details and the functionality of an improved automated system is described.

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“…In addition to the impedance tube, which is widely used to measure the reflection coefficient of a material (usually a solid-state material), the pulse echo technique was developed to determine the acoustic impedance of a liquid by measuring the ultrasonic velocity in the liquid and its liquid density. Joshi et al [ 23 , 24 ] and Iwase et al [ 25 ] have described this technique in detail. Furthermore, ultrasound-based elastography methods were developed to determine the bulk modulus or density of hard and soft materials [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Development and Applications of a Pressurized Water-Filled Impedance Tube

Shen

Huang

Liu

2022

Sensors

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In this study, a pressurized, water-filled impedance tube (WFIT) was developed to measure the reflection coefficients of sound-absorbing materials under various hydrostatic pressures. The developed WFIT was calibrated using a two-microphone, three-parameter calibration method (3PCM). The accuracy and repeatability of the measured reflection coefficients for the water–air interface in the WFIT were determined by comparing these coefficients with corresponding theoretical reflection coefficients. The WFIT was then used to measure the acoustic reflection coefficient of a porous rubber specimen on three dates, and the corresponding measurement results exhibited satisfactory repeatability. The aforementioned impedance tube was also used to measure the reflection coefficient of a porous rubber specimen under a hydrostatic pressure of 4 Patm three times on the same day, and one time each on three days, using the same experimental setup and measurement procedure. The results obtained in the aforementioned tests also exhibited satisfactory repeatability. Finally, the WFIT was used to measure the reflection coefficients of porous rubber specimens with various thicknesses under different hydrostatic pressures. The results of this study indicate that the developed WFIT calibrated with the 3PCM can achieve suitable repeatability in the measurement of the reflection coefficients of sound-absorbing materials under various hydrostatic pressures.

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Sensitivity Enhancement of Concurrent Technique of Acoustic Impedance Measurement

Cited by 5 publications

References 6 publications

Study on the Viscoelasticity Measurement of Materials Based on Surface Reflected Waves

Study on the Viscoelasticity Measurement of Materials Based on Surface Reflected Waves

Improved and Automated Primary Ultrasonic Power Measurement Setup at CSIR-NPL, India

Development and Applications of a Pressurized Water-Filled Impedance Tube

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