Water acoustic microscopy at suboptical wavelengths

Hadimioglu, B.; Quate, C. F.

doi:10.1063/1.94223

Cited by 65 publications

(25 citation statements)

References 2 publications

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“…3b. For a 4.4 GHz transducer, a resolution of 0.20 m was achieved beyond the theoretical limitation of 0.24 m by increasing the input power [163]. They found that some details in the specimen became visible during the increase of the input power level due to the nonlinear generation of higher harmonics, and the resolution could not be improved further after a certain level of input power was reached.…”

Section: Improvement Of Imaging Resolution Using Higher Harmonicsmentioning

confidence: 90%

See 1 more Smart Citation

Review / Sythèse Nonlinear acoustic applications for material characterization: A review

Zheng¹,

Maev²,

Solodov³

2000

Can. J. Phys.

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The nonlinear acoustic applications for material characterization are reviewed. The general theoretical analysis of the effects of nonlinearity, dissipation, dispersion, and diffraction on intense acoustic-wave propagation is given. Acoustic nonlinear parameters and their determination methods are introduced. The investigations of nonlinear acoustic applications for solid material evaluation are discussed for different levels of disruption, from asymmetry of lattice structure and dislocation in crystals to disbonds and cracks in engineering materials. The experimental methods involved in these investigations are also considered. The techniques used for nonlinear acoustic imaging are divided into two categories, concerned with resolution improvement by using higher harmonics, and nonlinear parametric imaging. The nonlinear acoustic applications in biomedical imaging, acoustic microscopy, and nonlinear nondestructive evaluation are presented. Finally, the issues that need further investigations in this area are discussed.

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Section: Improvement Of Imaging Resolution Using Higher Harmonicsmentioning

confidence: 90%

“…Hadimioglu and Quate [163], and Rugar [148] looked at the problem from a slightly different standpoint. A single transducer and lens were used in their studies, and the acoustic microscope operated in the reflection mode as shown in Fig.…”

Section: Improvement Of Imaging Resolution Using Higher Harmonicsmentioning

confidence: 98%

Review / Sythèse Nonlinear acoustic applications for material characterization: A review

Zheng¹,

Maev²,

Solodov³

2000

Can. J. Phys.

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show abstract

“…This objective has generally been pursued with two approaches; one approach was to raise the acoustic frequency [2]. By means of this approach, Hadimiooglu and Quate achieved a resolution of 0.2 p by operating at about 4.4 GHz with the specimen in boiling water to minimize the attenuation of the coupling medium [3]. The second approach was to use low-velocity coupling media such as superfluid liquid helium [4].…”

Section: Introductionmentioning

confidence: 99%

Practical Shear Wave Lens Design for Improved Resolution with Acoustic Microscope

Miyasaka¹,

Tittmann

Ohno

1999

Research in Nondestructive Evaluation

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This paper presents a practical new lens design for acoustic microscopy. The new lens provides a factor-of-2 higher resolution than currently available commercial lenses for acoustic microscopy, and a reduction in the influence of surface roughness on the image formation. Analysis, computer simulations, and demonstration examples provide convincing evidence that new lens design works efficiently. Whereas most current lens designs emphasize the use of longitudinal waves, the designs presented here focus on the use of transverse or shear waves. In the present study, two kinds of lens designs have been developed: One is a "center-sealed" acoustic lens used at the center frequency of 400 MHz and 1 GHz for use with acoustic tone bursts, and the other is a "high-NA acoustic lens" used in the center frequency of 30 MHz for use with short pulses.The center-sealed acoustic lens has its center area aperture sealed to prevent longitudinal waves from traveling into the sample so that the acoustic image is substantially composed of shear wave components. The "high-NA" acoustic lens has an aperture with a large aperture angle for exciting shear waves in the object. In this study, the mechanisms of image formation with both of these lenses are described and their features are evaluated.

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“…This objective has generally been pursued with two approaches; one approach was to raise the acoustic frequency [2]. By means of this approach, Hadimiooglu and Quate achieved a resolution of 0.2 µ by operating at about 4.4 GHz with the specimen in boiling water to minimize the attenuation of the coupling medium [3]. The second approach was to use low-velocity coupling media such as superfluid liquid helium [4].…”

Section: Introductionmentioning

confidence: 99%

Practical Shear Wave Lens Design for Improved Resolution with Acoustic Microscope

1999

View full text Add to dashboard Cite

This paper presents a practical new lens design for acoustic microscopy. The new lens provides a factor-of-2 higher resolution than currently available commercial lenses for acoustic microscopy, and a reduction in the influence of surface roughness on the image formation. Analysis, computer simulations, and demonstration examples provide convincing evidence that new lens design works efficiently. Whereas most current lens designs emphasize the use of longitudinal waves, the designs presented here focus on the use of transverse or shear waves. In the present study, two kinds of lens designs have been developed: One is a "center-sealed" acoustic lens used at the center frequency of 400 MHz and 1 GHz for use with acoustic tone bursts, and the other is a "high-NA acoustic lens" used in the center frequency of 30 MHz for use with short pulses. The center-sealed acoustic lens has its center area aperture sealed to prevent longitudinal waves from traveling into the sample so that the acoustic image is substantially composed of shear wave components. The "high-NA" acoustic lens has an aperture with a large aperture angle for exciting shear waves in the object. In this study, the mechanisms of image formation with both of these lenses are described and their features are evaluated.

show abstract

Water acoustic microscopy at suboptical wavelengths

Cited by 65 publications

References 2 publications

Review / Sythèse Nonlinear acoustic applications for material characterization: A review

Review / Sythèse Nonlinear acoustic applications for material characterization: A review

Practical Shear Wave Lens Design for Improved Resolution with Acoustic Microscope

Practical Shear Wave Lens Design for Improved Resolution with Acoustic Microscope

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