Nondestructive characterization of soft materials and biofilms by measurement of guided elastic wave propagation using optical coherence elastography

Soft Matter ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 575-586 ◽  
Author(s):  
Hong-Cin Liou ◽  
Fabrizio Sabba ◽  
Aaron I. Packman ◽  
George Wells ◽  
Oluwaseyi Balogun
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Mixed Culture ◽  
Viscoelastic Properties ◽  
Guided Waves ◽  
Soft Materials ◽  
Bacterial Biofilms ◽  
Optical Coherence ◽  
Nondestructive Characterization

Elastic guided waves were generated in mixed-culture bacterial biofilms for characterizing its viscoelastic properties.

scholarly journals Applied Sciences Special Issue: Ultrasonic Guided Waves

2019 ◽  
Vol 9 (18) ◽  
pp. 3869 ◽  
Author(s):  
Clifford J. Lissenden
Keyword(s):  
Applied Sciences ◽  
Scientific Inquiry ◽  
Guided Waves ◽  
Ultrasonic Guided Waves ◽  
Special Issue ◽  
Practical Applications ◽  
Material State ◽  
Characterization Of Materials ◽  
Nondestructive Characterization

The propagation of ultrasonic guided waves in solids is an important area of scientific inquiry due primarily to their practical applications for the nondestructive characterization of materials, such as nondestructive inspection, quality assurance testing, structural health monitoring, and for achieving material state awareness [...]

Towards mechanical characterization of granular biofilms by optical coherence elastography measurements of circumferential elastic waves

Soft Matter ◽  
2019 ◽  
Vol 15 (28) ◽  
pp. 5562-5573 ◽  
Author(s):  
Hong-Cin Liou ◽  
Fabrizio Sabba ◽  
Aaron I. Packman ◽  
Alex Rosenthal ◽  
George Wells ◽  
...  
Keyword(s):  
Elastic Waves ◽  
Viscoelastic Properties ◽  
Mechanical Characterization ◽  
Optical Coherence ◽  
Model Based

This paper presents a metrology approach combining optical coherence elastography measurements of circumferential elastic waves and model-based inverse analyses to nondestructively characterize the viscoelastic properties of soft spherical gels.

Characterization of Moon Rock Media With Elastic Waves

2003 ◽  
Author(s):  
Bernhard R. Tittmann
Keyword(s):  
Porous Media ◽  
Wave Propagation ◽  
Elastic Wave ◽  
Frequency Band ◽  
Elastic Waves ◽  
Porous Ceramics ◽  
The Moon ◽  
Powder Metal ◽  
Device Applications

Elastic wave propagation in porous media will be introduced by a discussion of scattering to show the use of broad frequency band pulses in relating the attenuation, velocity and backscattering to information on porosity. Examples will be given for microporosity in castings and powder metal components. This will be followed by a discussion of the influence of volatiles within the pores on the absorption of elastic waves in porous ceramics and rocks. Implications of these findings will be given for ultrasonic device applications and for the interpretation of the lunar seismic experiments carried out as part of the Apollo missions to the moon.

scholarly journals Dynamic optical coherence tomography measurements of elastic wave propagation in tissue-mimicking phantoms and mouse corneain vivo

2013 ◽  
Vol 18 (12) ◽  
pp. 121503 ◽  
Author(s):  
Jiasong Li ◽  
Shang Wang ◽  
Ravi Kiran Manapuram ◽  
Manmohan Singh ◽  
Floredes M. Menodiado ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Wave Propagation ◽  
Elastic Wave ◽  
Elastic Wave Propagation ◽  
Optical Coherence

scholarly journals An approach to viscoelastic characterization of dispersive media by inversion of a general wave propagation model

2017 ◽  
Vol 10 (06) ◽  
pp. 1742008 ◽  
Author(s):  
Fernando Zvietcovich ◽  
Jannick P. Rolland ◽  
Kevin J. Parker
Keyword(s):  
Wave Propagation ◽  
Acoustic Radiation ◽  
Order Approximation ◽  
Propagation Model ◽  
Dispersive Media ◽  
Inversion Method ◽  
Optical Coherence ◽  
Estimation Errors ◽  
Wave Propagation Model

In the characterization of elastic properties of tissue using dynamic optical coherence elastography, shear/surface waves are propagated and tracked in order to estimate speed and Young’s modulus. However, for dispersive tissues, the displacement pulse is highly damped and distorted during propagation, diminishing the effectiveness of peak tracking approaches, and leading to biased estimates of wave speed. Further, plane wave propagation is sometimes assumed, which contributes to estimation errors. Therefore, we invert a wave propagation model that incorporates propagation, decay, and distortion of pulses in a dispersive media in order to accurately estimate its elastic and viscous components. The model uses a general first-order approximation of dispersion, avoiding the use of any particular rheological model of tissue. Experiments are conducted in elastic and viscoelastic tissue-mimicking phantoms by producing a Gaussian push using acoustic radiation force excitation and measuring the wave propagation using a Fourier domain optical coherence tomography system. Results confirmed the effectiveness of the inversion method in estimating viscoelastic parameters in both the viscoelastic and elastic phantoms when compared to mechanical measurements. Finally, the viscoelastic characterization of a fresh porcine cornea was conducted. Preliminary results validate this approach when compared to other methods.

Elastic wave propagation in a fluid‐filled borehole and synthetic acoustic logs

Geophysics ◽  
1981 ◽  
Vol 46 (7) ◽  
pp. 1042-1053 ◽  
Author(s):  
Chuen Hon Cheng ◽  
M. Nafi Toksöz
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Decay Rate ◽  
Elastic Waves ◽  
Guided Waves ◽  
Effective Radius ◽  
Dispersion Characteristics ◽  
Stoneley Waves ◽  
Full Wave ◽  
Shale Formation

The propagation and dispersion characteristics of guided waves in a fluid‐filled borehole are studied using dispersion curves and modeling full‐wave acoustic logs by synthetic microseismograms. The dispersion characteristics of the pseudo‐Rayleigh (reflected) and Stoneley waves in a borehole with and without a tool in the center are compared. Effects of different tool properties are calculated. The effect of a rigid tool is to make the effective borehole radius smaller. As an approximation, dispersion characteristics of the guided waves in a borehole with a tool can be calculated as a purely fluid‐filled borehole with a smaller effective radius. Theoretical waveforms (microseismograms) of elastic waves propagating in a borehole are calculated using a discrete wavenumber integration. With an appropriate choice of parameters, our results look similar to the acoustic waveforms recorded in a limestone and a shale formation. Several factors affect the shape of an acoustic log microseismogram. The effective radius of the borehole determines the relative amplitudes of the modes generated. Poisson’s ratio of the formation is the primary factor determining the relative amplitude of the leaky mode following the compressional arrival. Attenuation affects the duration and decay rate of the guided waves.

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