Research On Underwater Detection Based On Monte Carlo Method

In recent years,with the development of marine science,underwater detection has become a hot research topic.Correlation imaging has become a popular imaging method for underwater detection in recent years because of its unique imaging method.Correlation imaging,also known as ghost imaging,is a new type of imaging technology that has evolved in recent years.It uses the second or higher order information of the light field to carry on the correlation operation to obtain the detection target image,may neglect the light field polarization and the phase information.In particular,in the case of weak light intensity,only the use of no space resolution of the barrel detector,you can target the object through the signal intensity fluctuations to get the target object information.In this paper,intensity correlation imaging technology applied to the study of underwater detection,the paper mainly completed the following work.1,The speed of the associated imaging and the amount of sampled data are studied,using Hadamard matrix as a modulation scheme,greatly reducing the amount of sampling data;high-speed projector and high-speed signal acquisition system used in associated imaging,high-speed projector applications.With The optical modulation rate improving,the correlation imaging speed is greatly improved,and the correlation imaging scheme is optimized.Set up a high-speed associated imaging experiment system.2,The Monte Carlo Simulation algorithm is used to study the transmission characteristics of optical signals underwater.In this algorithm,the optical characteristics of seawater are added to obtain the model of photon transport underwater,and the regular characteristics of photon scattering and echo signal arc investigated under underwater transmission.The distance gating technique is used to make the collected echo signal The image signal to noise ratio can be greatly improved.3,The simulation experiment of underwater correlation imaging is carried out.According to the principle of associative imaging experiment,combined with the transmission model of the optical underwater transmission given by the predecessors,the distance gating technology is applied to the program,which improves the underwater imaging distance and greatly improves the signal-to-noise ratio.