Analysis of Detection Inversion of Water Optical Characteristics by Lidar

Journal of Atmospheric and Environmental Optics ›› 2018, Vol. 13 ›› Issue (1): 59-64.

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Analysis of Detection Inversion of Water Optical Characteristics by Lidar

LI Xiaolong1,2*, LI Jie2, ZHANG Bing3, CHEN Yonghua1, ZHAO Chaofang2, LIU zhishen2

(1 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China;
3 Qingdao Academy for Opto-Electronics Engineering, Qingdao 266109)

Received:2016-10-19 Revised:2017-01-25 Online:2018-01-28 Published:2018-02-06
Contact: 李晓龙 (1985-)，男, 汉族，山东临沂人，工程师，博士，主要从事海洋信息探测技术方面的研究。 E-mail:lixiaolong@qdio.ac.cn
About author:李晓龙（1985-），男,山东临沂人，高级工程师，博士，主要从事海洋信息探测技术方面的研究。
Supported by:
Supported by National Natural Science Foundation of China (国家自然科学基金, 61505221), Science Fund for Technology Strategic Pilot of the Chinese Academy of Sciences (中科院先导专项, XDA11040306), National Science and Technology Major Project of the Ministry of Science and Technology of China (科技重点专项, 2016YFC1402602)

Abstract

Abstract:

Multiple scattering is an important factor for measuring water optical characteristic parameters (including absorption coefficient a, attenuation coefficientc, diffuse attenuation coefficient K_d) by Lidar. Meanwhile, Field of View (FOV) is a key parameter which affects the proportion of multiple scattering in receiving echoes. In this study，a parameter of FOV (q_rcvr) is introduced into the inversion method of water optical properties by ocean Lidar based on the Mclean-Walker model. In the cases of shipboard, airborne and spaceborne platforms at the height of 10 m, 300 m, 7´10⁵ m respectively, scattering echoes are calculated according to the Lidar theory. The inversion of water optical parameters is analysed with multiple scattering factor under different FOVs. It is shown that assuming that the incident laser of highly collimated, q_rcvrand detecting height H are critical factors which influence inversion results in the method for obtaining water optical parameters from laser scattering echo. It is worth noting that the physical meaning of the Lidar attenuation coefficient K_lidarchanges with the factors. K_lidar can be considered as c when q_rcvr is approximately 0. And K_lidar gradually approaches K_d with the increase of q_rcvr´H.

Key words: lidar, water optical characteristics, multiple scattering, field of view

CLC Number:

TN958

LI Xiao-Long, LI Jie, ZHANG Bing, CHEN Yong-Hua, DIAO Chao-Fang, LIU Zhi-Shen. Analysis of Detection Inversion of Water Optical Characteristics by Lidar[J]. Journal of Atmospheric and Environmental Optics, 2018, 13(1): 59-64.

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