Acoustic Parameters of Commercial Plastics

Hung, B.N.; Goldstein, A

doi:10.1109/t-su.1983.31415

Cited by 39 publications

(8 citation statements)

References 11 publications

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“…However, some inherent benefits of this method are that the amplitude ratios are not affected by operating the transducer away from its resonance frequency because none of the echo signals considered arise from reflections at the buffer-transducer interface [10] and that the measurement of the same amplitude ratios are not affected by the acoustic coupling layer between the transducer and the buffer. This method has been quite extensively used for various applications as exemplified by liquid 0885-3010/$25.00 c 2008 IEEE density measurements [12]- [14], high temperature attenuation measurements in metals approaching their melting point [15], for prediction of grain size in copper [16], and for attenuation measurements of sedimentary rocks under high pressure [17], in addition to material characterization of plastics and polymers [18], [19].…”

Section: A Short-pulse Methodsmentioning

confidence: 99%

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Bjorndal¹,

Frøysa

2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Abstract-The known acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell are presented, along with 2 new generic approaches for measuring the pressure reflection coefficient using 2 buffer rods enclosing the liquid to be characterized in a symmetrical arrangement. An acoustic transducer is connected to each of the buffer rods. The generic approaches are divided into a relative amplitude approach and a mixed amplitude approach. For the relative amplitude approach, families of 4, 5, or 6 echo signals can be used to obtain the pressure reflection coefficient. The mixed amplitude approach uses specific information about the transducers and/or the electronics sensitivities in receive mode to obtain the pressure reflection coefficient using families of 3, 4, 5, or 6 echo signals. Some of the new methods from the relative amplitude approach imply a reduced uncertainty relative to the previously known ABC method. The effect of the liquid attenuation, digitizer bit resolution, and the signal-to-noise ratio on the uncertainty characteristics of the pressure reflection coefficient are discussed, along with a discussion of the suitability of the various methods for different buffer materials.

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Section: A Short-pulse Methodsmentioning

confidence: 99%

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Bjorndal¹,

Frøysa

2008

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…Moreover, viscoelastic losses were accounted for in the rheological modeling of nylon and the attenuation coefficient ␣ L s ͑f͒ was taken from Hung and Goldstein, 1983 ͑see Table I͒. The attenuation coefficient ␣ SV s ͑f͒ was considered equal to ␣ L s ͑f͒ as the attenuation of transverse shear waves could not be found in literature.…”

Section: Phantom Mimicking Trabecular Bonementioning

confidence: 99%

Velocity dispersion in trabecular bone: Influence of multiple scattering and of absorption

Haïat

Lhémery

Renaud

et al. 2008

The Journal of the Acoustical Society of America

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Speed of sound measurements are widely used clinically to assess bone strength. Trabecular bone is an attenuating composite material in which negative values of velocity dispersion have been measured, this behavior remaining poorly explained physically. The aim of this work is to describe the ultrasonic propagation in trabecular bone modeled by infinite cylinders immersed in a saturating matrix, and to derive the physical determinants of velocity dispersion. A homogenization model accounting for the coupling of multiple scattering and absorption phenomena allows the computation of phase velocity and of dispersion while varying bone properties. The present model is adapted from the generalized self-consistent method developed in the work of Yang and Mal [(1994). "Multiple-scattering of elastic waves in a fiber-reinforced composite," J. Mech. Phys. Solids 42, 1945-1968]. It predicts negative values of velocity dispersion, in agreement with experimental results obtained in phantoms mimicking trabecular bone. In trabecular bone, mostly negative and also positive values of velocity dispersion are predicted by the model, which span within the range of values measured experimentally. Scattering effects are responsible for the negative values of dispersion, whereas the frequency dependence of the absorption coefficient in bone marrow and/or in the trabeculae results in an increase in dispersion, which may then become positive.

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“…The influence of the curvature of the pipe on the pressure field was investigated by Thompson and Aldis (1996) and Tortoli et al (1999). Regarding flow adapter material selection, Nowak (2002) and Hung and Goldstein (1983) are of interest as they give sound velocities and densities for various relevant materials (e.g. nylon, PEHD, PET (Mylar), PMMA (Plexiglas), POM (Delrin), PVC and Teflon).…”

Section: Flow Adaptermentioning

confidence: 99%

Doppler Ultrasound‐Based Rheology

Birkhofer

2010

Practical Food Rheology

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Acoustic Parameters of Commercial Plastics

Cited by 39 publications

References 11 publications

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Acoustic methods for obtaining the pressure reflection coefficient from a buffer rod based measurement cell

Velocity dispersion in trabecular bone: Influence of multiple scattering and of absorption

Doppler Ultrasound‐Based Rheology

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