Angular measurement of acoustic reflection coefficients by the inversion of V(z, t) data with high frequency time-resolved acoustic microscopy

2012 ◽  
Vol 83 (1) ◽  
pp. 014901 ◽  
Author(s):  
Jian Chen ◽  
Xiaolong Bai ◽  
Keji Yang ◽  
Bing-Feng Ju
Keyword(s):  
High Frequency ◽  
Acoustic Microscopy ◽  
Angular Measurement ◽  
Reflection Coefficients ◽  
Time Resolved ◽  
Acoustic Reflection

Biological Acoustic Microscopy - Living Cells at 37°C and Fixed Cells in Cryogenic Liquids

1982 ◽  
Vol 40 ◽  
pp. 174-177
Author(s):  
J.A. Hildebrand ◽  
D. Rugar ◽  
C.F. Quate
Keyword(s):  
High Frequency ◽  
Acoustic Microscopy ◽  
Single Element ◽  
Acoustic Image ◽  
Acoustic Reflection ◽  
Glass Substrates ◽  
Acoustic Images ◽  
Cryogenic Liquids ◽  
Chick Heart ◽  
Coupling Medium

The scanning reflection acoustic microscope uses high frequency sound to create images with sub-micron resolution. A single-element sapphire lens focuses sound to a diffraction-limited spot in a liquid coupling medium. With the object placed near the focus, the spot of sound is mechanically scanned while the magnitude of the acoustic reflection is recorded for each point on the object. The resulting acoustic image is bright in areas of large acoustic reflection and dark in areas of small acoustic reflection. Acoustic images of biological cells contain information on cellular viscous, elastic and topographic properties. This paper presents acoustic images of living and fixed chick heart fibroblasts grown on glass substrates.

Mechanical Properties of Single Cells by High-Frequency Time-Resolved Acoustic Microscopy

2007 ◽  
Vol 54 (11) ◽  
pp. 2257-2271 ◽  
Author(s):  
Eike C. Weiss ◽  
Pavlos Anastasiadis ◽  
Gotz Pilarczyk ◽  
Robert M. Lemor ◽  
Pavel V. Zinin
Keyword(s):  
Mechanical Properties ◽  
High Frequency ◽  
Single Cells ◽  
Acoustic Microscopy ◽  
Time Resolved

scholarly journals High-Frequency Time-Resolved Scanning Acoustic Microscopy for Biomedical Applications

2018 ◽  
Vol 12 (1) ◽  
pp. 69-85 ◽  
Author(s):  
Pavlos Anastasiadis ◽  
Pavel V. Zinin
Keyword(s):  
High Frequency ◽  
Focused Ultrasound ◽  
Ultrasound Biomicroscopy ◽  
Acoustic Microscopy ◽  
High Frequency Ultrasound ◽  
Time Resolved ◽  
Biochemical Processes ◽  
Wide Range ◽  
Progression Of Disease ◽  
Frequency Ultrasound

High-frequency focused ultrasound has emerged as a powerful modality for both biomedical imaging and elastography. It is gaining more attention due to its capability to outperform many other imaging modalities at a submicron resolution. Besides imaging, high-frequency ultrasound or acoustic biomicroscopy has been used in a wide range of applications to assess the elastic and mechanical properties at the tissue and single cell level. The interest in acoustic microscopy stems from the awareness of the relationship between biomechanical and the underlying biochemical processes in cells and the vast impact these interactions have on the onset and progression of disease. Furthermore, ultrasound biomicroscopy is characterized by its non-invasive and non-destructive approach. This, in turn, allows for spatiotemporal studies of dynamic processes without the employment of histochemistry that can compromise the integrity of the samples. Numerous techniques have been developed in the field of acoustic microscopy. This review paper discusses high-frequency ultrasound theory and applications for both imaging and elastography.

scholarly journals Coupled time resolved and high frequency modulated photoluminescence probing surface passivation of highly doped n-type InP samples

2021 ◽  
Vol 129 (21) ◽  
pp. 215305
Author(s):  
Wei Zhao ◽  
Baptiste Bérenguier ◽  
Cendra Rakotoarimanana ◽  
Anne-Marie Gonçalves ◽  
Arnaud Etcheberry ◽  
...  
Keyword(s):  
High Frequency ◽  
Surface Passivation ◽  
Time Resolved

scholarly journals Location of agate geodes in Permian deposits of Simota gully using the GPR

2021 ◽  
Author(s):  
Michał Mierczak ◽  
Jerzy Karczewski
Keyword(s):  
Signal Processing ◽  
High Frequency ◽  
Electromagnetic Energy ◽  
Reflection Coefficients ◽  
Electric Permittivity ◽  
Pyroclastic Deposits ◽  
High Attenuation ◽  
Subsurface Geology ◽  
Study Test

AbstractThe article describes the establishment of the location of agate geodes using the GPR method in the area of the Simota gully (Lesser Poland Voivodeship). Agates (a multicolored variety of gemstone of chalcedony group) have multifaceted values that informed their study. Traditional methods of geode location are less reliable, hence the attempt to use the GPR method. Measurements were taken at two study test sites with subsurface geology of weathered melaphyre and pyroclastic deposits using a GPR system (ProEx). A high-frequency antenna (1.6 GHz) was used along with the pre-established profiles of lengths of 6-m and 10-cm intervals. Furthermore, simple soil tests using the soil sampler tool were made prior to the GPR measurement. The GPR results show significant high attenuation of the electromagnetic energy interpreted to be due to clay components of the regolith. Advanced signal processing procedures (such as the attribute of the signal) were used on the data for better enhancement that aided interpretation. Other anomalies depicted on the radargrams were thought to be the presence of roots, pieces of melaphyres-targeted agates. Furtherance to ascertain the reflection coefficients as recorded on the GPR data, in situ samples (root pieces, melaphyres, agates) taken were tested in the laboratory for electric permittivity property. Based on the interpretation results, several agate geodes were dug out from the ground.

scholarly journals Discrimination of nano-objects via cluster analysis techniques applied to time-resolved thermo-acoustic microscopy

Ultrasonics ◽  
2021 ◽  
Vol 114 ◽  
pp. 106403
Author(s):  
Andrea Ronchi ◽  
Andrea Sterzi ◽  
Marco Gandolfi ◽  
Ali Belarouci ◽  
Claudio Giannetti ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Acoustic Microscopy ◽  
Time Resolved ◽  
Analysis Techniques
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