Research On Measurement Error Analysis And Compensation For Photonic Integrated Interferometric Imaging

The high-resolution imaging in optical system has great significance in aerospace,astronomical observation,military investigation,disaster early warning and so on.The photonic integrated interferometric imaging system based on the principle of interference is a revolutionary concept to realize the high-resolution image reconstruction.The imaging system combines the photonics and synthetic aperture technique to realize ultra-thin and ultra-lightweight synthetic-aperture systems with high-resolution,real-time,and multi-spectral imaging capabilities,which has significant advantages to the traditional optical system.In general,the interference imaging system is sensitive to errors.The errors in the optical process will affect the measurement accuracy of interferometric visibility and result in poor image quality.Therefore,it is critical to study the errors in the photonic integrated interferometric imaging system.The main work of this paper is as follows:1.Based on the interference theory,the image reconstruction principle of the interferometric imaging system is studied in this paper.On this basis,we explain the structure and workflow of photon integrated interference imaging system,and analyze the principle,structure and function of each module in system.Also,we analyze the performance parameters such as the resolution,coupling efficiency and field of view of the photonic integrated interference imaging system,and compare them with the traditional single aperture imaging system.2.We analyze the transmission process of optical signal in different modules and establish the theoretical model of photon integrated interference imaging system.Take the structure of the spider system as an example,the imaging process is simulated numerically.Image quality evaluation methods are used to quantitatively evaluate the influence of different structure parameters on system imaging quality.3.The array error of photonic integrated interference imaging system is analyzed,and we study the corresponding error compensation approach to improve the quality of the reconstructed image.On the basis of image reconstruction principle,we analyze the source of the array error in the imaging system,and classify array error according to effect of error to measurement accuracy of interferometric visibility.Also,we study the measurement method of interferometric visibility and image reconstruction algorithm for non-coplanar array caused by array error in photon integrated interference imaging system.Moreover,the influence of array errors on the imaging performance is evaluated and summarized through computer numerical simulation.Based on the above conclusions,we propose an error compensation approach for array error.This approach can reduce the impact of array error on imaging performance by configuring some short redundant baselines in the imaging system,and the effectiveness of proposed approach is verified through numerical simulation.Simulation results show that this approach has the best compensation effect on array failure and relatively poor compensation effect on array out-plane misalignment.4.Aiming at the instrumental error of beam combiner in photonic integrated interference imaging system,and we propose an online calibration approach for largescale integrated photonic beam combinations that can achieve high-accuracy interferometric measurement.By switching condition and the optical path differences between calibration beams,the instrumental characteristics including transmission characteristics and interferometric characteristics could be calibrated accurately.Compared to the conventional approach,the calibration procedure and estimation method are greatly simplified in this paper.The effectiveness of the proposed approach is validated using a photonic integrated circuit with two interferometric channels.The calibration results show that our proposed scheme effectively enhances the measuring precision for object visibility,and the differences between the phase relations are less than 1.41% between the proposed and conventional approaches.Also,we design an online calibration compensation system with the simple structure for photonic integrated interference imaging system,which available to rapid calibration of instrumental error of beam combiner.5.The systematic verification experiment of photon integrated interference imaging is carried out.In the experiment,we obtain complex visibility by sampling the target information with five baselines of different length simultaneously.Based on the experimental results,the influence of error factors for complex visibility are analyzed,and the simulation experiment is used to analyze the impact of error on the reconstructed image.