关键词: 海洋大气光学/
湍流强度/
空间外尺度/
功率谱标度指数
English Abstract
Experimental investigation of open sea atmospheric optical turbulence
Wang Qian1,2,Mei Hai-Ping1,
Li Yu-Jian3,
Shao Shi-Yong1,
Li Xue-Bin1,
Rao Rui-Zhong1
1.Key Laboratory of Atmospheric Composition and Optical Radiation, Center for Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3.China Satellite Maritime Tracking and Control Department, Jiangyin 214431, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant No. 41205010).Received Date:29 October 2015
Accepted Date:04 December 2015
Published Online:05 April 2016
Abstract:In this article, a high-quality fiber optical turbulence sensing array is arranged on the ocean-going instrumentation ship-Yuan Wang for 37 day continuous measurement. It is the first time that the spatial multipoint simultaneous measurement of maritime atmospheric optical turbulence has been realized. According to the measurement, the essential characteristics and quantitative data of the atmospheric optical turbulence on the open sea are obtained. Then the Greenwood spatial correlation function model is used for evaluating the outer scale of optical turbulence by a nonlinear fitting algorithm. Finally, the optical turbulence spectrum is divided into two sections, and the power spectrum scaling exponent is given by a section algorithm. Results show that the intensity of maritime atmospheric optical turbulence is a little smaller than that in the near ground layer and has no obvious diurnal variation characteristic. The value of outer scale is small and in a range of 0.2-0.3 m. It is easily found that the probability that the turbulence spectrum scaling exponent conforms to -5/3 is about 25% near the surface of open sea, which is smaller than that in the near ground layer.
Keywords: maritime atmospheric optics/
optical turbulence intensity/
spatial outer scale/
power spectrum scaling exponent
