同步扫描水下激光成像系统的蒙特卡洛仿真及优化

针对水下激光同步扫描三角测距成像系统受水介质散射和吸收影响导致作用距离减小、目标反射点图像质量变差等问题,从辐射传输理论出发,采用蒙特卡洛方法建立水下激光传输的随机模型,利用TracePro软件进行光线追迹仿真,得到反射点图像相对散射光背景的对比度。探讨了目标距离、激光光强、基线距离、物镜口径等改变对对比度的影响关系,从而对水下激光同步扫描三角测距成像系统参数作了优化设计。最后从系统实际情况和需要出发,确定激光光强1 W,基线距离250 mm,成像物镜50 mm/F2,确保在7.5 m距离范围内,有较好的目标反射点图像对比度,从而保证了同步扫描三角测距原理的实施。

Monte Carlo simulation and optimal design of synchronous scanning underwater laser imaging system

Aimed at the short working distance and the low target image quality problems of synchronous scanning trigonometric ranging underwater laser imaging system caused by scattering and absorption,a stochastic model of underwater laser transmission is established by using Monte Carlo method based on the radiation transmission theory.The influence of target distance,laser intensity,baseline distance and objective caliber on the contrast quality of laser illumination target reflection image is discussed using TracePro,and the system parameters are optimized.Finally,based on the actual situation and needs of the system,the laser light intensity of 1 W,baseline distance of 250 mm,and the lens specification 50 mm /F2 are determined to ensure a better image contrast of target reflection point within the range of 7.5 m,thus ensuring the implementation of the synchronous scanning triangulation principle.