Semiconductor dynamic aperture for near-field terahertz wave imaging

2001 ◽  
Vol 7 (4) ◽  
pp. 608-614 ◽  
Author(s):  
Q. Chen ◽  
X.-C. Zhang
Keyword(s):  
Near Field ◽  
Terahertz Wave ◽  
Wave Imaging ◽  
Dynamic Aperture

scholarly journals Micro Non-Uniform Linear Array (MNULA) for Ultrasound Plane Wave Imaging

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 640
Author(s):  
Yujia Tang ◽  
Zhangjian Li ◽  
Yaoyao Cui ◽  
Chen Yang ◽  
Jiabing Lv ◽  
...  
Keyword(s):  
Plane Wave ◽  
Linear Array ◽  
Near Field ◽  
Uniform Linear Array ◽  
Imaging Technology ◽  
Linear Arrays ◽  
Imaging Quality ◽  
Imaging Results ◽  
Wave Imaging ◽  
Laboratory Technology

Ultrasound plane wave imaging technology has been applied to more clinical situations than ever before because of its rapid imaging speed and stable imaging quality. Most transducers used in plane wave imaging are linear arrays, but their structures limit the application of plane wave imaging technology in some special clinical situations, especially in the endoscopic environment. In the endoscopic environment, the size of the linear array transducer is strictly miniaturized, and the imaging range is also limited to the near field. Meanwhile, the near field of a micro linear array has serious mutual interferences between elements, which is against the imaging quality of near field. Therefore, we propose a new structure of a micro ultrasound linear array for plane wave imaging. In this paper, a theoretical comparison is given through sound field and imaging simulations. On the basis of primary work and laboratory technology, micro uniform and non-uniform linear arrays were made and experimented with the phantom setting. We selected appropriate evaluation parameters to verify the imaging results. Finally, we concluded that the micro non-uniform linear array eliminated the artifacts better than the micro uniform linear array without the additional use of signal processing methods, especially for target points in the near-field. We believe this study provides a possible solution for plane wave imaging in cramped environments like endoscopy.

Sparse Array Optimization Using Simulated Annealing and Compressed Sensing for Near-Field Millimeter Wave Imaging

2014 ◽  
Vol 62 (4) ◽  
pp. 1716-1722 ◽  
Author(s):  
Borja Gonzalez-Valdes ◽  
Gregory Allan ◽  
Yolanda Rodriguez-Vaqueiro ◽  
Yuri Alvarez ◽  
Spiros Mantzavinos ◽  
...  
Keyword(s):  
Simulated Annealing ◽  
Compressed Sensing ◽  
Millimeter Wave ◽  
Near Field ◽  
Millimeter Wave Imaging ◽  
Sparse Array ◽  
Wave Imaging ◽  
Array Optimization

Terahertz wave near-field compressive imaging with a spatial resolution of over λ/100

2018 ◽  
Vol 44 (1) ◽  
pp. 21 ◽  
Author(s):  
Si-Chao Chen ◽  
Liang-Hui Du ◽  
Kun Meng ◽  
Jiang Li ◽  
Zhao-Hui Zhai ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Near Field ◽  
Terahertz Wave ◽  
Compressive Imaging

Dynamic Aperture of Near-Field Super Resolution Structures

2000 ◽  
Vol 39 (Part 1, No. 2B) ◽  
pp. 982-983 ◽  
Author(s):  
Din Ping Tsai ◽  
Chi Wen Yang ◽  
Wei Chih Lin ◽  
Fu Han Ho ◽  
Hung Ji Huang ◽  
...  
Keyword(s):  
Near Field ◽  
Super Resolution ◽  
Dynamic Aperture

Near-field millimeter-wave imaging for weapons detection

1993 ◽  
Author(s):  
David M. Sheen ◽  
Douglas L. McMakin ◽  
H. D. Collins ◽  
Thomas E. Hall
Keyword(s):  
Millimeter Wave ◽  
Near Field ◽  
Millimeter Wave Imaging ◽  
Wave Imaging
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