Two-dimensional phase gradient autofocus

2000 ◽  
Author(s):  
Douglas W. Warner ◽  
Dennis C. Ghiglia ◽  
Alan Fitzgerrell ◽  
John Beaver
Keyword(s):  
Two Dimensional ◽  
Phase Gradient

Weighted-phase-gradient-based quality maps for two-dimensional quality-guided phase unwrapping

2012 ◽  
Vol 50 (10) ◽  
pp. 1397-1404 ◽  
Author(s):  
Yuangang Lu ◽  
Wancheng Zhao ◽  
Xuping Zhang ◽  
Weihong Xu ◽  
Guoliang Xu
Keyword(s):  
Phase Unwrapping ◽  
Two Dimensional ◽  
Phase Gradient ◽  
Gradient Based ◽  
Quality Maps

A two‐dimensional beam tilted Fabry‐Perot antenna based on a phase gradient partially reflecting surface

2019 ◽  
Vol 62 (2) ◽  
pp. 887-892 ◽  
Author(s):  
Yongtao Jia ◽  
Ying Liu ◽  
Xuerui Yang ◽  
Xu Yang ◽  
Lei Sun
Keyword(s):  
Two Dimensional ◽  
Phase Gradient ◽  
Fabry Perot ◽  
Reflecting Surface

Two-dimensional coding phase gradient metasurface for RCS reduction

2018 ◽  
Vol 51 (37) ◽  
pp. 375103 ◽  
Author(s):  
Maochang Feng ◽  
Yongfeng Li ◽  
Qiqi Zheng ◽  
Jieqiu Zhang ◽  
Yajuan Han ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Phase Gradient

scholarly journals The New TLC Method for Separation and Determination of Multicomponent Mixtures of Plant Extracts

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Elżbieta Matysik ◽  
Anna Woźniak ◽  
Roman Paduch ◽  
Robert Rejdak ◽  
Beata Polak ◽  
...  
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Gradient System ◽  
Two Dimensional ◽  
Phase Gradient ◽  
One Dimensional ◽  
Dominant Component ◽  
Phase Condition ◽  
Layer Chromatography

The new mode of two-dimensional gradient thin layer chromatography (MGD-2D TLC) has been presented. Short distance development of sample in the first dimension leads to formation of the preconcentrated narrow zones. They are consecutively separated in the second dimension with the mobile phase gradient in several steps of development until the eluent reaches the further end of the chromatographic plate. The use of the above-mentioned technique allows isolating and then identifying the compounds of various polarity from the multicomponent mixture. The practical application of two-dimensional gradient thin layer chromatography has been performed for isolation of the two plant (JuniperusandThymus) oils components as the examples of test mixtures. The experiments have been carried out with the use of silica gel plates as well as a normal phase condition. The results of solute separation with isocratic one-dimensional thin layer chromatography system have been compared with those of two-dimensional gradient system. It has been observed that application of the latter mode leads to almost triplicated number of zones in comparison with the former one. It is purposeful to apply the proposed mode to control the purity of the dominant component or components of the mixture.

Full-field interferometric measurement of head-tape contact spacing

1997 ◽  
Vol 211 (4) ◽  
pp. 289-293
Author(s):  
R Swain ◽  
E Baugh ◽  
F E Talke
Keyword(s):  
Ease Of Use ◽  
Field Of View ◽  
Fringe Field ◽  
Two Dimensional ◽  
Phase Gradient ◽  
Full Field ◽  
Interferometric Measurement ◽  
Dynamic Head ◽  
Heterodyne Technique ◽  
Illumination Source

Interferometry is the preferred measurement method for the contact spacing of the head-tape interface, due to its ease of use and high accuracy. Full-field techniques provide spacing data at all points in the field of view as opposed to a single measurement point. Dynamic interferometric measurement necessitates the use of a strobed illumination source, and thus prohibits the alteration of the fringe field to resolve the ill-constrained nature of the analysis problem. In addition, the head-tape contact problem is further complicated by the low phase gradient in the region of head-tape contact, which is often large in comparison to the field of view. In this paper two algorithms are compared which do not require alteration of the fringe field and therefore can easily be applied to the dynamic head-tape interface. The first technique is a two-dimensional implementation of a biquadratic fit to the fringe extremes, while the second is a pseudo-spatial heterodyne technique using the two-dimensional Fourier transform. Theoretical implementation and results are presented.

scholarly journals Design and verification of a two-dimensional wide band phase-gradient metasurface

2015 ◽  
Vol 64 (9) ◽  
pp. 094101
Author(s):  
Li Yong-Feng ◽  
Zhang Jie-Qiu ◽  
Qu Shao-Bo ◽  
Wang Jia-Fu ◽  
Wu Xiang ◽  
...  
Keyword(s):  
Wide Band ◽  
Two Dimensional ◽  
Phase Gradient

Wideband radar cross section reduction using two-dimensional phase gradient metasurfaces

2014 ◽  
Vol 104 (22) ◽  
pp. 221110 ◽  
Author(s):  
Yongfeng Li ◽  
Jieqiu Zhang ◽  
Shaobo Qu ◽  
Jiafu Wang ◽  
Hongya Chen ◽  
...  
Keyword(s):  
Cross Section ◽  
Radar Cross Section ◽  
Two Dimensional ◽  
Phase Gradient ◽  
Wideband Radar
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