Laser & Optoelectronics Progress, Volume. 59, Issue 12, 1201001(2022)
Analysis of Near Sea-Surface Optical Turbulence Characters Based on Hilbert-Huang Transform
Hanjiu Zhang1,2, Gang Sun2、*, Kun Zhang1,2, Yang Wu1,2, Feifei Wang2, Xuebin Li2, Shengcheng Cui2, Qing Liu2, and Ningquan Weng1,2
Author Affiliations
1School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui , China2Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, Anhui , Chinashow less
We used a microtemperature sensor to measure the atmospheric refractive index structure constant of near sea-surface and combined ensemble empirical mode decomposition (EEMD) to obtain the intrinsic mode function (IMF) component with different time scales. Furthermore, the analysis of the IMFs’ periods indicates that their mean periods have a high correlation of natural exponential function. Thus, we can derive the space characters based on the ergodicity property of atmospheric turbulence. The result of the Hilbert transform for the IMF component shows the different scale fluctuations near the center frequency of each IMF. Additionally, we can obtain the Hilbert-Huang transform marginal spectrum of conventional meteorological elements and , and the results indicate that it is superior to the traditional fast-Fourier transform (FFT) in reflecting spectral distribution characteristics of optical turbulence. Further, we analyze the relationship between the and conventional meteorological elements under different atmospheric stratification. From above, we can learn more about the space-time characters of near sea-surface optical turbulence, and the study results will provide some references for laser propagation in the marine atmosphere.