scholarly journals Robust variable range focusing with a virtual source array using the waveguide invariant in underwater

2017 ◽  
Vol 36 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Gi Hoon Byun ◽  
J.S. Kim
Keyword(s):  
Virtual Source ◽  
Variable Range ◽  
Waveguide Invariant ◽  
Source Array

scholarly journals Multi-MHz laser-scanning single-cell fluorescence microscopy by spatiotemporally encoded virtual source array

2017 ◽  
Vol 8 (9) ◽  
pp. 4160 ◽  
Author(s):  
Jianglai Wu ◽  
Anson H. L. Tang ◽  
Aaron T. Y. Mok ◽  
Wenwei Yan ◽  
Godfrey C. F. Chan ◽  
...  
Keyword(s):  
Fluorescence Microscopy ◽  
Single Cell ◽  
Laser Scanning ◽  
Virtual Source ◽  
Source Array

Spatial resolution of time-reversal processing with a virtual source array

2017 ◽  
Vol 142 (4) ◽  
pp. 2731-2731
Author(s):  
Donghyeon Kim ◽  
Gihoon Byun ◽  
Jea Soo Kim
Keyword(s):  
Spatial Resolution ◽  
Time Reversal ◽  
Virtual Source ◽  
Source Array

Multiple time-reversal focusing with a virtual source array

2018 ◽  
Vol 143 (3) ◽  
pp. 1789-1789
Author(s):  
Gihoon Byun ◽  
H. C. Song ◽  
J. S. Kim
Keyword(s):  
Time Reversal ◽  
Multiple Time ◽  
Virtual Source ◽  
Source Array

scholarly journals Virtual Source Array-Based Multiple Time-Reversal Focusing

2018 ◽  
Vol 8 (1) ◽  
pp. 99 ◽  
Author(s):  
Gihoon Byun ◽  
Heechun Song ◽  
Jeasoo Kim
Keyword(s):  
Time Reversal ◽  
Multiple Time ◽  
Virtual Source ◽  
Source Array

scholarly journals Role of Scattering in Virtual Source Array Imaging

2014 ◽  
Vol 7 (2) ◽  
pp. 1210-1236 ◽  
Author(s):  
Josselin Garnier ◽  
George Papanicolaou
Keyword(s):  
Virtual Source ◽  
Array Imaging ◽  
Source Array

scholarly journals Signal to Noise Ratio Analysis in Virtual Source Array Imaging

2015 ◽  
Vol 8 (1) ◽  
pp. 248-279 ◽  
Author(s):  
Josselin Garnier ◽  
George Papanicolaou ◽  
Adrien Semin ◽  
Chrysoula Tsogka
Keyword(s):  
Signal To Noise Ratio ◽  
Ratio Analysis ◽  
Virtual Source ◽  
Signal To Noise ◽  
Noise Ratio ◽  
Array Imaging ◽  
Source Array

Development of a conical anode Fe-gun for low voltage SEM

1988 ◽  
Vol 46 ◽  
pp. 978-979
Author(s):  
T. Miyokawa ◽  
S. Norioka ◽  
S. Goto
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Low Voltage ◽  
Irradiation Damage ◽  
Cold Cathode ◽  
Virtual Source ◽  
Source Position ◽  
Electrostatic Lens ◽  
Electrostatic Lenses ◽  
Wide Range

Field emission SEMs (FE-SEMs) are becoming popular due to their high resolution needs. In the field of semiconductor product, it is demanded to use the low accelerating voltage FE-SEM to avoid the electron irradiation damage and the electron charging up on samples. However the accelerating voltage of usual SEM with FE-gun is limited until 1 kV, which is not enough small for the present demands, because the virtual source goes far from the tip in lower accelerating voltages. This virtual source position depends on the shape of the electrostatic lens. So, we investigated several types of electrostatic lenses to be applicable to the lower accelerating voltage. In the result, it is found a field emission gun with a conical anode is effectively applied for a wide range of low accelerating voltages.A field emission gun usually consists of a field emission tip (cold cathode) and the Butler type electrostatic lens.

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