Material Characterization by Acoustic Microscope with Line-Focus Beam

Kushibiki, J.; Ohkubo, Atsushi; Chubachi, Noriyoshi

doi:10.1007/978-1-4613-9780-9_10

Cited by 61 publications

(76 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A coustic fields enable nonintrusive inspection of condensed matter, detection and even thermal excitation via energy focusing. Biomedical imaging (1,2), detection of underwater objects (3) or damage in materials (4), and hyperthermia surgery via nonintrusive scalpels (5-7) stand as prominent examples. The focusing of acoustic waves at a desired location is usually realized with electromechanical transducers and methods such as geometric focusing (4), time-reversal focusing (8), or beamforming via phase lags (5,9,10).…”

mentioning

confidence: 99%

Generation and control of sound bullets with a nonlinear acoustic lens

Spadoni¹,

Daraio

2010

Proc. Natl. Acad. Sci. U.S.A.

243

176

View full text Add to dashboard Cite

Acoustic lenses are employed in a variety of applications, from biomedical imaging and surgery to defense systems and damage detection in materials. Focused acoustic signals, for example, enable ultrasonic transducers to image the interior of the human body. Currently however the performance of acoustic devices is limited by their linear operational envelope, which implies relatively inaccurate focusing and low focal power. Here we show a dramatic focusing effect and the generation of compact acoustic pulses (sound bullets) in solid and fluid media, with energies orders of magnitude greater than previously achievable. This focusing is made possible by a tunable, nonlinear acoustic lens, which consists of ordered arrays of granular chains. The amplitude, size, and location of the sound bullets can be controlled by varying the static precompression of the chains. Theory and numerical simulations demonstrate the focusing effect, and photoelasticity experiments corroborate it. Our nonlinear lens permits a qualitatively new way of generating high-energy acoustic pulses, which may improve imaging capabilities through increased accuracy and signalto-noise ratios and may lead to more effective nonintrusive scalpels, for example, for cancer treatment. A coustic fields enable nonintrusive inspection of condensed matter, detection and even thermal excitation via energy focusing. Biomedical imaging (1, 2), detection of underwater objects (3) or damage in materials (4), and hyperthermia surgery via nonintrusive scalpels (5-7) stand as prominent examples. The focusing of acoustic waves at a desired location is usually realized with electromechanical transducers and methods such as geometric focusing (4), time-reversal focusing (8), or beamforming via phase lags (5, 9, 10). In geometric focusing, the transducers' geometry is exploited to focus signals. In time-reversal and beamforming methods, appropriate phase delays among acoustic signals are used to focus them in a desired region. Each method is limited by its reliance on actuators, which are incapable of generating compact, nonoscillatory, and high-amplitude signals, typically resulting in cumbersome and application-specific devices. Recently, acoustic metamaterials (11) as well as superlenses (12) and hyperlenses (13) aimed at improving spatial resolution have been introduced. However, their continued reliance on linear wave dynamics limits their spatial accuracy, energy intensity, and dynamic focus control.Here we introduce an acoustic lens that uses nonlinear wave dynamics to accurately focus high-amplitude acoustic signals, achieving a transient focal region of higher energy density than previously possible. The position, amplitude, and frequency content of the focal region in an adjacent solid or fluid host medium are dynamically controllable. The acoustic lens consists of an array of nonlinear transducers based on discrete power-law materials (e.g., chains of spherical particles) (Fig. 1A). In contrast to linear elastic materials in which force F and deformation δ ob...

show abstract

mentioning

confidence: 99%

Generation and control of sound bullets with a nonlinear acoustic lens

Spadoni¹,

Daraio

2010

Proc. Natl. Acad. Sci. U.S.A.

243

176

View full text Add to dashboard Cite

show abstract

“…Although this great achievement made it possible to measure the acoustic properties quantitatively, the principle of the point-focus system (using a spherical lens with which a plane wave radiating from the transducer is circularly focused into a point) had a disadvantage to excite leaky surface acoustic wave propagating in all directions [14]. In order to detect the acoustic properties of both isotropic and anisotropic materials, a linearly focused acoustic beam was proposed by Kushibiki et al in 1981 [15].…”

Section: Research Historymentioning

confidence: 99%

Corrosion evaluation of additive manufacture metal alloy by nondestructive line-focused transducer

Ji¹,

Li²,

Wang³

et al. 2017

2017 IEEE International Ultrasonics Symposium (IUS)

View full text Add to dashboard Cite

iv In this study, the elastic properties of the additive manufactured and the traditional manufactured standard sample of stainless steel -grade 420 (SS420) before and after the electrochemical corrosion will be characterized by using the line-focused ultrasonic transducer system. The calculation was based on the measurement of the surface Rayleigh wave's velocity. The result showed that the velocity of the surface wave and Young's modulus had a negative correlation with the degree of corrosion, which means as the degree of the corrosion became severer, the velocity of the surface wave and Young's modulus decreased. A galvanic cell to simulate the electrochemical corrosion in this test was established and a concave transducer with a motorized stage was used to emit and detect the ultrasonic waves which could be used in surface wave's calculation.This thesis research includes four parts: 1) theoretical consideration of the surface wave propagating and the elastic constants in an isotropic material; 2) basic principles and procedures of the measurement regarding the surface Rayleigh wave and the corrosion evaluation; 3) data processing and the result of Young's modulus variation with regards to the corrosion; 4) the conclusions about this experiment and some future expectations.

show abstract

“…The mechanical scanning acoustic reflection microscope (hereinafter called simply "SAM") operating with frequencies substantially ranging from 0.1 to 2.0 GHz has proven to be a useful apparatus for characterizing of anisotropic materials on the scale of individual grains [1,2,3]. Note that the SAM is basically designed to visualize the surface and/or the subsurface of microstructure features of the material, but not directly the acoustic waves propagating within the material.…”

Section: Introductionmentioning

confidence: 99%

Laser Measurement of SAM Bulk and Surface Wave Amplitudes for Material Microstructure Analysis

Miyasaka¹,

Telschow²,

Cottle³

2006

AIP Conference Proceedings

View full text Add to dashboard Cite

ABSTRACT. We present a hybrid acoustic imaging technique to directly visualize acoustic waves propagating within a thin silicon plate. A high frequency acoustic point focus lens was used to form a small point source within the plate. A laser interferometric system was used to visualize the acoustic wave propagation. Distinct amplitude patterns at each focal plane were experimentally visualized. The measured amplitude patterns exhibited the cubic symmetry of the material and the effects of focusing of the source outside and inside the material.

show abstract

Material Characterization by Acoustic Microscope with Line-Focus Beam

Cited by 61 publications

References 16 publications

Generation and control of sound bullets with a nonlinear acoustic lens

Generation and control of sound bullets with a nonlinear acoustic lens

Corrosion evaluation of additive manufacture metal alloy by nondestructive line-focused transducer

Laser Measurement of SAM Bulk and Surface Wave Amplitudes for Material Microstructure Analysis

Contact Info

Product

Resources

About