Research On Image Reconstruction Method Of Integrated Optical Interference Imaging

Integrated optical interference imaging is a new imaging idea based on optical synthetic aperture technology and photonic integrated circuit technology,aiming at greatly reducing the weight,size and power consumption of imaging system and achieving high resolution imaging.The development of this technology is beneficial to reduce the volume and weight of space load,which not only has important research value in military space imaging mechanism,but also has broad application prospect in space optical remote sensing,space situation awareness and astronomical observation as a new generation of photoelectric imaging system.Different from the traditional optical system imaging directly on the glue sheet and CCD,the original data obtained by the integrated optical interference imaging system do not fully contain the complex coherent measurement values of the amplitude and phase of the target spectrum,and the object surface information needs to be calculated and restored.But because the spatial frequency sampling value is too sparse,simple inverse Fourier transform can not get a clean spatial brightness image.This paper focuses on the ill-posed inverse problem of image reconstruction to study the influencing factors and methods to improve system imaging quality.The main work contents are as follows:1.The imaging mechanism of integrated optical interference imaging system,photonic integrated circuit layout,the signal transmission process in the comprehensive and systematic research and discussion,and the imaging field,resolution,system parameters such as receiving energy and effective aperture of single photodetector have carried on the detailed theoretical analysis,by comparing with the traditional single aperture imaging features,the performance advantages of integrated optical interference imaging technology are demonstrated.2.Based on the structural design model of SPIDER imaging system,the imaging capability of integrated optical interference imaging system in single waveguide is simulated and verified.Based on the simulation experiments,the factors that limit the imaging quality of the system are analyzed,including micro-lens array arrangement,interference baseline pairing mode and array waveguide grating channel number.The results show that the imaging quality of the system depends on the spectrum coverage degree and coverage characteristics of U-V space.3.In view of the limited number of SPIDER system lenses and fixed photonic integrated circuit layout,a new imaging system structure and optimization design based on compressed sensing theory are proposed.The design uses the real-time-gating lens array of circular aperture mask plate to flexibly adjust the baseline pairing mode.Thus,0/1 binary sparse pseudo random measurement matrix is constructed to improve the data acquisition of the target optical signal.4.Based on the above design,a theoretical model of interference imaging image reconstruction is established,and the image reconstruction effects and related performance parameters under three system structures are simulated and compared.Based on theoretical analysis and experimental verification,the structure and optimization design of the new imaging system can increase the spectrum coverage of U-V space,improve the accuracy of image reconstruction,greatly simplify the design of photonic integrated circuits,and reduce the hardware implementation pressure and manufacturing cost.