Results 1 to 10 of about 118,438 (174)

A Mitigation Method for Optical-Turbulence-Induced Errors and Optimal Target Design in Vision-Based Displacement Measurement [PDF]

Sensors, 2023
Computer vision-based displacement measurement techniques are increasingly used for structural health monitoring. However, the vision sensors employed are easily affected by optical turbulence when capturing images of the structure, resulting in ...
Xingyu Huang, Wujiao Dai, Yunsheng Zhang, Lei Xing, Yichao Ye   +4 more
doaj   +2 more sources

Improved equivalent optical turbulence method for anisotropic compressible and atmospheric turbulence under different beam transmission distances [PDF]

Scientific Reports
The impact of different turbulence on beams can be seen as optical distortions caused by refractive index fluctuations around vortices in turbulence. Therefore, from the perspective of transmission effects, the transmission outcomes of beam in different ...
Wenjie Wu, Jinyu Xie, Lu Bai
doaj   +2 more sources

Optical Communication Through Random Atmospheric Turbulence [PDF]

Applied Optics, 1969
In this paper we compare the theoretical performances of two schemes of optical communication through the atmospheric turbulence: (1) heterodyne detection and (2) video detection.
Comly, Jack, Laussade, Jean-Pierre, Yariv, Amnon   +2 more
core   +5 more sources

Blind Equalization Based on Modified Third-Order Moment Algorithm for PAM-PPM Optical Signals in FSO Communication [PDF]

Sensors
In order to mitigate the influence of turbulence on pulse amplitude modulation–pulse position modulation (PAM-PPM) optical signals, which represents a promising avenue for future high-speed free-space optical (FSO) communication, this paper proposes a ...
Shutian Luo, Xiaofeng Li
doaj   +2 more sources

Analyzing the Effects of a Basin on Atmospheric Environment Relevant to Optical Turbulence

Photonics, 2022
The performance of adaptive optics (AO) systems are highly dependent upon optical turbulence. Thus, it is necessary to have the appropriate knowledge of the spatiotemporal characteristics of optical turbulence strength.
Manman Xu, Liangping Zhou, Shiyong Shao, Ningquan Weng, Qing Liu   +4 more
doaj   +1 more source

A Survey of Structure of Atmospheric Turbulence in Atmosphere and Related Turbulent Effects

Atmosphere, 2021
The Earth’s atmosphere is the living environment in which we live and cannot escape. Atmospheric turbulence is a typical random inhomogeneous medium, which causes random fluctuations of both the amplitude and phase of optical wave propagating through it.
Fazhi Wang, Wenhe Du, Qi Yuan, Daosen Liu, Shuang Feng   +4 more
doaj   +1 more source

Non-Classic Atmospheric Optical Turbulence: Review

Applied Sciences, 2021
Theoretical models and results of experimental campaigns relating to non-classic regimes occurring in atmospheric optical turbulence are overviewed.
Olga Korotkova, Italo Toselli
doaj   +1 more source

Laboratory Measurements of the Influence of Turbulence Intensity on the Instantaneous-Fading Reciprocity of Bidirectional Atmospheric Laser Propagation Link

Applied Sciences, 2021
The reciprocity of the atmospheric turbulence channel in the bidirectional atmospheric laser propagation link is experimentally tested. The bidirectional transceiving coaxial atmospheric laser propagation link is built by using a hot air convection-type ...
Yi Liu, Zhi Liu, Yidi Chang, Yang Liu, Huilin Jiang   +4 more
doaj   +1 more source

Atmospheric Optical Turbulence Characteristics over the Ocean Relevant to Astronomy and Atmospheric Physics

Applied Sciences, 2021
Due to the space and time constraints of turbulence measurement equipment and the experiment scene, it is difficult to obtain the atmosphere refractive index structure constant over the ocean.
Manman Xu, Shiyong Shao, Ningquan Weng, Liangping Zhou, Qing Liu, Yuefeng Zhao   +5 more
doaj   +1 more source

Multistep ahead atmospheric optical turbulence forecasting for free-space optical communication using empirical mode decomposition and LSTM-based sequence-to-sequence learning

Frontiers in Physics, 2023
Although free-space optical communication (FSOC) is a promising means of high data rate satellite-to-ground communication, beam distortion caused by atmospheric optical turbulence remains a major challenge for its engineering applications.
Yalin Li, Hongqun Zhang, Lang Li, Lang Li, Lang Li, Lu Shi, Lu Shi, Yan Huang, Shiyao Fu, Shiyao Fu, Shiyao Fu   +10 more
doaj   +1 more source