Effect of oceanic turbulence on the visibility of underwater ghost imaging

2019 ◽  
Vol 36 (3) ◽  
pp. 397 ◽  
Author(s):  
Qin-Wei Zhang ◽  
Wen-Dong Li ◽  
Kai Liu ◽  
Long-Wen Zhou ◽  
Zhao-Ming Wang ◽  
...  
Keyword(s):  
Ghost Imaging ◽  
Oceanic Turbulence

scholarly journals Ghost Imaging with a Partially Coherent Beam Carrying Twist Phase in a Turbulent Ocean: A Numerical Approach

2019 ◽  
Vol 9 (15) ◽  
pp. 3023 ◽  
Author(s):  
Yonglei Liu ◽  
Xianlong Liu ◽  
Lin Liu ◽  
Fei Wang ◽  
Yuping Zhang ◽  
...  
Keyword(s):  
Numerical Approach ◽  
Coherent Beam ◽  
Ghost Imaging ◽  
Oceanic Turbulence ◽  
Partially Coherent ◽  
Rytov Approximation ◽  
Twist Factor ◽  
Imaging Approach ◽  
Optical Paths

Ghost imaging (GI) is an indirect imaging approach that can retrieve an object’s image even in a harsh environment through measuring the fourth-order correlation function (FOCF) between the signal and idle optical paths. In this paper, we study lensless GI with a partially coherent beam carrying twist phase, i.e., twisted Gaussian Schell-model (TGSM) beam, in the presence of oceanic turbulence. Explicit expression of the FOCF is derived based on the optical coherence theory and Rytov approximation, and the effects of the twist phase and the oceanic turbulence on the quality and visibility of image are investigated in detail through numerical examples. Our results show that the simulated oceanic turbulence strongly affects the GI. The quality of image decreases monotonously with an increase of the strength of turbulence whereas the visibility increases. When the illumination light carries a twist phase, the visibility of the image is improved while the quality of the image is reduced in contrast to those without a twist phase. By properly selecting the strength of the twist phase, the image can still be maintained at an acceptable level of quality with high visibility. Furthermore, it is found that the quality and visibility of the ghost image are less affected by the oceanic turbulence using a TGSM beam with larger twist factor. Our findings will be useful for the application of GI in an oceanic turbulent environment.

Imaging Analysis of Reflective Ghost Imaging in Oceanic Turbulence

2020 ◽  
Vol 49 (9) ◽  
pp. 901002-901002
Author(s):  
张钦伟 Qin-wei ZHANG ◽  
曹连振 Lian-zhen CAO ◽  
刘霞 Xia LIU ◽  
杨阳 Yang YANG ◽  
赵加强 Jia-qiang ZHAO ◽  
...  
Keyword(s):  
Ghost Imaging ◽  
Imaging Analysis ◽  
Oceanic Turbulence

scholarly journals Experimental demonstration of spectral domain computational ghost imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Piotr Ryczkowski ◽  
Caroline G. Amiot ◽  
John M. Dudley ◽  
Goëry Genty
Keyword(s):  
Signal To Noise Ratio ◽  
Michelson Interferometer ◽  
Spectral Domain ◽  
Proof Of Concept ◽  
Ghost Imaging ◽  
Spectral Measurements ◽  
Spectral Filter ◽  
Wavelength Division ◽  
Spectral Encoding ◽  
Light Effects

AbstractWe demonstrate computational spectral-domain ghost imaging by encoding complementary Fourier patterns directly onto the spectrum of a superluminescent laser diode using a programmable spectral filter. Spectral encoding before the object enables uniform spectral illumination across the beam profile, removing the need for light collection optics and yielding increased signal-to-noise ratio. In addition, the use of complementary Fourier patterns allows reduction of deleterious of parasitic light effects. As a proof-of-concept, we measure the wavelength-dependent transmission of a Michelson interferometer and a wavelength-division multiplexer. Our results open new perspectives for remote broadband spectral measurements.

Correspondence Fourier-transform ghost imaging

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
Chenyu Hu ◽  
Ruiguo Zhu ◽  
Hong Yu ◽  
Shensheng Han
Keyword(s):  
Fourier Transform ◽  
Ghost Imaging

scholarly journals Counterfactual ghost imaging

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Jonte R. Hance ◽  
John Rarity
Keyword(s):  
Signal To Noise Ratio ◽  
Ghost Imaging ◽  
Signal To Noise ◽  
Interesting Phenomenon ◽  
Order Of Magnitude ◽  
Noise Ratio

AbstractWe give a protocol for ghost imaging in a way that is always counterfactual—while imaging an object, no light interacts with that object. This extends the idea of counterfactuality beyond communication, showing how this interesting phenomenon can be leveraged for metrology. Given, in the infinite limit, no photons ever go to the imaged object, it presents a method of imaging even the most light-sensitive of objects without damaging them. Even when not in the infinite limit, it still provides a many-fold improvement in visibility and signal-to-noise ratio over previous protocols, with over an order of magnitude reduction in absorbed intensity.

An optical image encryption based on computational ghost imaging with sparse reconstruction

2021 ◽  
Vol 143 ◽  
pp. 106627
Author(s):  
Liansheng Sui ◽  
Zhi Pang ◽  
Ying Cheng ◽  
Yin Cheng ◽  
Zhaolin Xiao ◽  
...  
Keyword(s):  
Image Encryption ◽  
Optical Image ◽  
Sparse Reconstruction ◽  
Ghost Imaging ◽  
Optical Image Encryption

High compressive ghost imaging method based on discrete cosine transform using weight coefficient matching

2019 ◽  
Vol 66 (17) ◽  
pp. 1736-1743 ◽  
Author(s):  
Huazheng Wu ◽  
Xiangfeng Meng ◽  
Yurong Wang ◽  
Yongkai Yin ◽  
Xiulun Yang ◽  
...  
Keyword(s):  
Discrete Cosine Transform ◽  
Weight Coefficient ◽  
Imaging Method ◽  
Ghost Imaging ◽  
Cosine Transform ◽  
Coefficient Matching
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