Volume 41 Issue 8
Sep.  2012
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Article Navigation >  Infrared and Laser Engineering  > 2012  >  41(8): 2063-2067

Liang Shanyong, Zhang Wei, Wang Jiang, Wu Ronghua, Ma Zhiguo. Calculation method of near-field rejection rate of underwater[J]. Infrared and Laser Engineering, 2012, 41(8): 2063-2067.
Citation: Liang Shanyong, Zhang Wei, Wang Jiang, Wu Ronghua, Ma Zhiguo. Calculation method of near-field rejection rate of underwater[J]. Infrared and Laser Engineering, 2012, 41(8): 2063-2067.
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Calculation method of near-field rejection rate of underwater

  • 1.

    Electronic Engineering College,Naval University of Engineering,Wuhan 430033,China;

  • 2.

    No. 717 Research Institute of China Shipbuilding Industry Corporation,Wuhan 430033,China

  • The multiple scattering has happened when the laser pulse of the underwater lidar by wake is in the near-field transmission. Its coaxial optical system has a certain near-field suppression ability to the strong scattering and can prevent saturation of the receiver system. The near-field suppression ratio of the coaxial optical system is of great significance. The reason for that the traditional formula of photon returned contribution was not suitable for the near-field calculation was analyzed and a new formula was presented for underwater near-field coaxial optical system. A simple method to solve it with coordinate transforms was presented. The near-field suppression ratio was calculated based on Monte Carlo simulation. The relationship between near-field suppression ratio and suppression time and the relationship between near-field suppression ratio and the laser pulse width were analyzed and calculated. The results prove that this method can satisfy the needs of underwater coaxial optical system analysis completely.
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通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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Calculation method of near-field rejection rate of underwater

  • 1. Electronic Engineering College,Naval University of Engineering,Wuhan 430033,China;
  • 2. No. 717 Research Institute of China Shipbuilding Industry Corporation,Wuhan 430033,China

Abstract: The multiple scattering has happened when the laser pulse of the underwater lidar by wake is in the near-field transmission. Its coaxial optical system has a certain near-field suppression ability to the strong scattering and can prevent saturation of the receiver system. The near-field suppression ratio of the coaxial optical system is of great significance. The reason for that the traditional formula of photon returned contribution was not suitable for the near-field calculation was analyzed and a new formula was presented for underwater near-field coaxial optical system. A simple method to solve it with coordinate transforms was presented. The near-field suppression ratio was calculated based on Monte Carlo simulation. The relationship between near-field suppression ratio and suppression time and the relationship between near-field suppression ratio and the laser pulse width were analyzed and calculated. The results prove that this method can satisfy the needs of underwater coaxial optical system analysis completely.

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