Far-field imaging of acoustic waves by a two-dimensional sonic crystal

2005 ◽  
Vol 71 (5) ◽  
Author(s):  
Chunyin Qiu ◽  
Xiangdong Zhang ◽  
Zhengyou Liu
Keyword(s):  
Acoustic Waves ◽  
Far Field ◽  
Two Dimensional ◽  
Sonic Crystal ◽  
Field Imaging

Far-field focusing of acoustic waves by a two-dimensional phononic crystal with surface grating

2009 ◽  
Vol 87 (5) ◽  
pp. 57003 ◽  
Author(s):  
Zhaojian He ◽  
Xiaochun Li ◽  
Ke Deng ◽  
Jun Mei ◽  
Zhengyou Liu
Keyword(s):  
Acoustic Waves ◽  
Phononic Crystal ◽  
Far Field ◽  
Two Dimensional ◽  
Surface Grating

scholarly journals Two-dimensional Near-field and Far-field Imaging of a Ne-like Ar Capillary Discharge Table-top Soft X-ray Laser

1998 ◽  
Vol 9 (12) ◽  
pp. 55
Author(s):  
C. H. Moreno ◽  
M. C. Marconi ◽  
V. N. Shlyaptsev ◽  
B. R. Benware ◽  
C. D. Macchietto ◽  
...  
Keyword(s):  
Near Field ◽  
Capillary Discharge ◽  
Far Field ◽  
Two Dimensional ◽  
X Ray ◽  
Field Imaging

scholarly journals Two-dimensional near-field and far-field imaging of a Ne-like Ar capillary discharge table-top soft-x-ray laser

1998 ◽  
Vol 58 (2) ◽  
pp. 1509-1514 ◽  
Author(s):  
C. H. Moreno ◽  
M. C. Marconi ◽  
V. N. Shlyaptsev ◽  
B. R. Benware ◽  
C. D. Macchietto ◽  
...  
Keyword(s):  
Near Field ◽  
Capillary Discharge ◽  
Far Field ◽  
Two Dimensional ◽  
X Ray ◽  
Field Imaging

Tunable far-field acoustic imaging by two-dimensional sonic crystal with concave incident surface

2017 ◽  
Vol 31 (02) ◽  
pp. 1650259 ◽  
Author(s):  
Feng-Fu Shen ◽  
Dan-Feng Lu ◽  
Hong-Wei Zhu ◽  
Chang-Ying Ji ◽  
Qing-Fan Shi
Keyword(s):  
Wave Beam ◽  
Acoustic Imaging ◽  
Concave Surface ◽  
Far Field ◽  
Two Dimensional ◽  
Acoustic Image ◽  
Tuning Mechanism ◽  
Sonic Crystal ◽  
Ray Trace ◽  
Sonic Crystals

An additional concave incident surface comprised of two-dimensional (2D) sonic crystals (SCs) is employed to tune the acoustic image in the far-field region. The tunability is realized through changing the curvature of the concave surface. To explain the tuning mechanism, a simple ray-trace analysis is demonstrated based on the wave-beam negative refractive law. Then, a numerical confirmation is carried out. Results show that both the position and the intensity of the image can be tuned by the introduced concave surface.

scholarly journals Imaging with Local Speckle Intensity Correlations: Theory and Practice

2021 ◽  
Vol 40 (3) ◽  
pp. 1-22
Author(s):  
Marina Alterman ◽  
Chen Bar ◽  
Ioannis Gkioulekas ◽  
Anat Levin
Keyword(s):  
Near Field ◽  
Biological Tissues ◽  
Computational Imaging ◽  
Theory And Practice ◽  
Fluorescent Imaging ◽  
Light Sources ◽  
Far Field ◽  
Scattering Layer ◽  
Speckle Patterns ◽  
Field Imaging

Recent advances in computational imaging have significantly expanded our ability to image through scattering layers such as biological tissues by exploiting the auto-correlation properties of captured speckle intensity patterns. However, most experimental demonstrations of this capability focus on the far-field imaging setting, where obscured light sources are very far from the scattering layer. By contrast, medical imaging applications such as fluorescent imaging operate in the near-field imaging setting, where sources are inside the scattering layer. We provide a theoretical and experimental study of the similarities and differences between the two settings, highlighting the increased challenges posed by the near-field setting. We then draw insights from this analysis to develop a new algorithm for imaging through scattering that is tailored to the near-field setting by taking advantage of unique properties of speckle patterns formed under this setting, such as their local support. We present a theoretical analysis of the advantages of our algorithm and perform real experiments in both far-field and near-field configurations, showing an order-of magnitude expansion in both the range and the density of the obscured patterns that can be recovered.

Superresolution in far-field imaging

2002 ◽  
Vol 19 (3) ◽  
pp. 436 ◽  
Author(s):  
I. Leizerson ◽  
S. G. Lipson ◽  
V. Sarafis
Keyword(s):  
Far Field ◽  
Field Imaging

On the propagation of acoustic waves in quasi-two-dimensional conductors in a quantizing magnetic field

2003 ◽  
Vol 29 (7) ◽  
pp. 609-612 ◽  
Author(s):  
O. V. Kirichenko ◽  
V. G. Peschansky ◽  
O. Galbova ◽  
G. Ivanovski ◽  
D. Krstovska
Keyword(s):  
Magnetic Field ◽  
Acoustic Waves ◽  
Two Dimensional ◽  
Quantizing Magnetic Field
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