High resolution magnetic vector-field imaging with cold atomic ensembles

2011 ◽  
Vol 98 (7) ◽  
pp. 074101 ◽  
Author(s):  
M. Koschorreck ◽  
M. Napolitano ◽  
B. Dubost ◽  
M. W. Mitchell
Author(s):  
M. Awaji

It is necessary to improve the resolution, brightness and signal-to-noise ratio(s/n) for the detection and identification of point defects in crystals. In order to observe point defects, multi-beam dark-field imaging is one of the useful methods. Though this method can improve resolution and brightness compared with dark-field imaging by diffuse scattering, the problem of s/n still exists. In order to improve the exposure time due to the low intensity of the dark-field image and the low resolution, we discuss in this paper the bright-field high-resolution image and the corresponding subtracted image with reference to a changing noise level, and examine the possibility for in-situ observation, identification and detection of the movement of a point defect produced in the early stage of damage process by high energy electron bombardment.The high-resolution image contrast of a silicon single crystal in the [10] orientation containing a triple divacancy cluster is calculated using the Cowley-Moodie dynamical theory and for a changing gaussian noise level. This divacancy model was deduced from experimental results obtained by electron spin resonance. The calculation condition was for the lMeV Berkeley ARM operated at 800KeV.


2018 ◽  
Vol 67 (10) ◽  
pp. 2353-2362 ◽  
Author(s):  
Mohamed A. Abou-Khousa ◽  
K. T. Muhammed Shafi ◽  
Xie Xingyu

2019 ◽  
Vol 36 (12) ◽  
pp. 127601
Author(s):  
Wen-Hao He ◽  
Ming-Ming Dong ◽  
Zhen-Zhong Hu ◽  
Qi-Han Zhang ◽  
Bo Yang ◽  
...  

2020 ◽  
Author(s):  
Wei Yan ◽  
Jianjun Liu ◽  
Xiaoxia Zhang ◽  
Dawei Liu ◽  
Donghao Liu

<p>Mars is a planet in the solar system that is closer to the Earth and has the most similar natural environment to the Earth. It has always been the first choice for humans to go out of the Earth and Moon system for deep space exploration.</p><p>China’s First Mars Mission (HX-1) will be launched in 2020 with an orbiter and a lander rover. One of the scientific goals of our mission is to study the morphology and geologic structure of the Mars. In order to achieve this purpose, the orbiter is equipped with a High Resolution Imaging Camera (HiRIC) to obtain the high-resolution morphology data of typical regions and to study the formation and evolution of geologic structure. HiRIC consists of three TDI CCD line-scan detectors and two COMS area-array detectors. Each TDI CCD detector covers 5 spectral bands. Its main working mode is the panchromatic TDI CCD push-scan imaging with a maximum spatial resolution of 0.5m.</p><p>Ground scientific verification test is an effective way to comprehensively evaluate the performance, data quality of HiRIC, and to fully verify its on-orbit detection process and data processing methods. In this study, contents and results of ground scientific verification test for HiRIC is introduced. The engineering model is used here for image motion compensation effect evaluation test, focusing effect evaluation test, and outdoor field imaging test. The results show that, 1) HiRIC can calculate the image motion compensation parameters and control the camera imaging correctly according to the platform parameters of orbiter; 2) Focus processing is effective, and HiRIC can adapt to the high-resolution imaging needs of different orbit altitudes; 3) Clear image data can be obtained according to the on-orbit detection process in the outdoor field imaging test, and image data processing was correct. Image data quality, compression quality, and TDI CCD stitching accuracy all meet the requirements of the verification test. This test fully evaluated HiRIC's ability to obtain high-resolution image data of the surface of Mars.</p>


2014 ◽  
Vol 22 (26) ◽  
pp. 31875 ◽  
Author(s):  
Jisoo Kyoung ◽  
Doo Jae Park ◽  
Sun Jung Byun ◽  
Jaeho Lee ◽  
Soo Bong Choi ◽  
...  

2010 ◽  
Vol 18 (16) ◽  
pp. 17533 ◽  
Author(s):  
Hyungbae Moon ◽  
Yong-Joong Yoon ◽  
Wan-Chin Kim ◽  
No-Cheol Park ◽  
Kyoung-Su Park ◽  
...  

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