Research On Real-time Imaging System Of Spectral Polarization For Airborne Marine Environment Monitoring

With the rapid development of the marine economy,the damage to the marine environment has become increasingly serious.Harmful algal bloom and oil spilling have received attention as typical marine disasters.Therefore,countries around the world are vigorously developing marine environmental monitoring technologies such as optical detection.As the main technical means of marine targets,Optical detection has the advantages of rich information dimensions,strong resolving power and high efficiency,and has received widespread attention.However,ocean exploration has serious problems such as sea fog,flares and complex illumination,which seriously affect the detection effect.Traditional marine photoelectric detection mainly uses visible light intensity detection,low-light detection and other technologies,and cannot overcome the impact of the marine environment.Therefore,it is urgent to study new detection technologies to solve the above problems.Spectropolarimetric imaging technology combines spectral imaging technology with polarization imaging technology.As a recently emerging optical detection imaging technology,it has the advantages of improving contrast and increasing the working distance compared with traditional intensity detection methods.The amount of information acquired by remote sensing has been improved,and the ability to detect sea surface targets has been greatly improved.Based on the research of spectral polarization imaging technology,the overall design scheme of real-time imaging optical system for on-board marine environment monitoring spectral polarization is proposed.The optical design of the system is completed,and the imaging quality of the system is evaluated.,carry out simulation analysis.Firstly,the development status of spectral polarization imaging technology at home and abroad is analyzed.According to the different fields of spectral polarization imaging application and the indicators that can be achieved,the advantages and disadvantages of different spectral polarization imagers are compared.Secondly,based on the basic theory and technology of spectral imaging and polarization imaging,according to the different imaging methods,the working principle of several typical spectrometers and the working methods of several polarization detections are studied respectively,and comparative analysis is carried out to find out the problems.Conduct research in a targeted manner.Then,the principle and implementation method of Stokes spectral demodulation and restoration based on Fourier transform method are studied in depth.Focus on the research of key technologies such as reconstruction of Stokes spectrum and modulation and calibration of spectral polarization module,carry out simulation analysis,and verify the feasibility and correctness of the theory and method.Finally,aiming at the typical marine target monitoring requirements such as red tide and oil spill,the spectral polarization imaging optical system technical index is determined by analyzing the spectral resolution,the observation angle of view,the detection width and other parameters,the technical specifications of spectral polarization imaging optical system are determined,and the overall design scheme of airborne spectral polarization real-time imaging optical system is proposed.A real-time imaging optical system with dual Wollaston prisms is designed and simulated by using the polarization splitting method of double Wollaston prisms.The analysis results show that the imaging quality of the system is excellent,and it can meet the needs of marine target detection.It has important research and application value in the field of marine environmental monitoring.