phase reconstruction
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Author(s):  
Randy Lemons ◽  
Sergio Carbajo

Abstract In the context of diffractive optics, phase retrieval is a heavily investigated process of recreating an entire complex electric field from partial amplitude-only information through iterative algorithms. However, existing methods can fall into local minima during reconstructions or struggle to recover unusual and novel electric field distributions. We present a numerical method based on a global-optimization genetic algorithm that reconstructs non-trivial electric field distributions from single diffracted intensity distributions. Diffraction and propagation of the optical fields over arbitrary distances is modeled through implementation of the angular spectrum technique. Additionally, a coherently-locked laser array system is used as an experimental case-study demonstrating $0.09 \pi$ phase reconstruction accuracy of initial laser parameters from single intensity images.


2021 ◽  
Author(s):  
Olexander V. Dubolazov ◽  
O. Ushenko ◽  
A. Motrich ◽  
M Gavrylyak ◽  
I. Soltys ◽  
...  

2021 ◽  
pp. 2103948
Author(s):  
Zhe Li ◽  
Xin Zheng ◽  
Xuan Xiao ◽  
Yongkang An ◽  
Yanbo Wang ◽  
...  

2021 ◽  
Author(s):  
Yingming Xu ◽  
Xingchen Pan ◽  
Cheng Liu ◽  
Jianqiang Zhu

2021 ◽  
Vol 147 ◽  
pp. 106746
Author(s):  
Ji Tan ◽  
Zhaoshui He ◽  
Wenqing Su ◽  
Bo Dong ◽  
Yulei Bai ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7285
Author(s):  
Yuelin Qin ◽  
Ke Zhang ◽  
Xinlong Wu ◽  
Qingfeng Ling ◽  
Jinglan Hu ◽  
...  

Blast furnace slag, which is the main by-product of the ironmaking process discharged at 1450 °C, contains high-quality sensible heat, while oily sludge is the main solid waste produced in the process of gas exploration, storage, and transportation. The energy and resource utilization of blast furnace slag is complementary to the environmentally friendly treatment of oily sludge, which has provided a new idea for the multi-factor synergistic cycle and energy transformation of the two wastes. The pyrolysis of the oily sludge with the molten blast furnace slag was conducted in the current paper. Results showed that the oily sludge was rapidly pyrolyzed, and the heavy metal elements in the oily sludge were solidified. The solidification rate of the heavy metals exceeds 90%, except for vanadium. The reconstituted water-quenched blast furnace slag still has good activity, and it will not affect the further use of the slag after pyrolysis (BFS-P).


2021 ◽  
Vol 7 (12) ◽  
pp. 249
Author(s):  
Zhi Qiao ◽  
Xianbo Shi ◽  
Michael Wojcik ◽  
Lahsen Assoufid

Near-field X-ray speckle tracking has been used in phase-contrast imaging and tomography as an emerging technique, providing higher contrast images than traditional absorption radiography. Most reported methods use sandpaper or membrane filters as speckle generators and digital image cross-correlation for phase reconstruction, which has either limited resolution or requires a large number of position scanning steps. Recently, we have proposed a novel coded-mask-based multi-contrast imaging (CMMI) technique for single-shot measurement with superior performance in efficiency and resolution compared with other single-shot methods. We present here a scanning CMMI method for the ultimate imaging resolution and phase sensitivity by using a coded mask as a high-contrast speckle generator, the flexible scanning mode, the adaption of advanced maximum-likelihood optimization to scanning data, and the multi-resolution analysis. Scanning CMMI can outperform other speckle-based imaging methods, such as X-ray speckle vector tracking, providing higher quality absorption, phase, and dark-field images with fewer scanning steps. Scanning CMMI is also successfully demonstrated in multi-contrast tomography, showing great potentials in high-resolution full-field imaging applications, such as in vivo biomedical imaging.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hyunmin Kim ◽  
Chaesung Lim ◽  
Ohhun Kwon ◽  
Jinkyung Oh ◽  
Matthew T. Curnan ◽  
...  

AbstractTo significantly increase the amount of exsolved particles, the complete phase reconstruction from simple perovskite to Ruddlesden-Popper (R-P) perovskite is greatly desirable. However, a comprehensive understanding of key parameters affecting the phase reconstruction to R-P perovskite is still unexplored. Herein, we propose the Gibbs free energy for oxygen vacancy formation in Pr0.5(Ba/Sr)0.5TO3-δ (T = Mn, Fe, Co, and Ni) as the important factor in determining the type of phase reconstruction. Furthermore, using in-situ temperature & environment-controlled X-ray diffraction measurements, we report the phase diagram and optimum ‘x’ range required for the complete phase reconstruction to R-P perovskite in Pr0.5Ba0.5-xSrxFeO3-δ system. Among the Pr0.5Ba0.5-xSrxFeO3-δ, (Pr0.5Ba0.2Sr0.3)2FeO4+δ – Fe metal demonstrates the smallest size of exsolved Fe metal particles when the phase reconstruction occurs under reducing condition. The exsolved nano-Fe metal particles exhibit high particle density and are well-distributed on the perovskite surface, showing great catalytic activity in fuel cell and syngas production.


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