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Vol. 163, Issue 1, January 2014, pp. 107-112

 

Bullet

 

The Research of Optical Turbulence Model in Underwater Imaging System
 

1 Liying Sun, 2 Junping Wang, 1 Kecheng Yang, 1 Min Xia, 1 Jiefei Han

1 School of Optical and Electronic information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Hubei Polytechnic Institute, Xiaogan 432000, China
1 Tel.: 15871699399, fax: 87556617-2

E-mail: kcyang@mail.hust.edu.cn, wjp818181@163.com

 

Received: 14 October 2013 /Accepted: 9 January 2014 /Published: 31 January 2014

Digital Sensors and Sensor Sysstems

 

Abstract: In order to research the effect of turbulence on underwater imaging system and image restoration, the underwater turbulence model is simulated by computer fluid dynamics. This model is obtained in different underwater turbulence intensity, which contains the pressure data that influences refractive index distribution. When the pressure value is conversed to refractive index, the refractive index distribution can be received with the refraction formula. In the condition of same turbulent intensity, the distribution of refractive index presents gradient in the whole region, with disorder and mutations in the local region. With the turbulence intensity increase, the holistic variation of the refractive index in the image is larger, and the refractive index change more tempestuously in the local region. All the above are illustrated by the simulation results with he ray tracing method and turbulent refractive index model. According to different turbulence intensity analysis, it is proved that turbulence causes image distortion and increases noise.

 

Keywords: Imaging system, Underwater turbulence model, Refractive index distribution, Ray tracing, Light intensity simulation.

 

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