Research On X-ray Intensity Correlation Interferometry Of Pulsars

Due to the stable X-ray period of pulsar,it is known as the"lighthouse in the universe",which is suitable as the"beacon"for the detection of autonomous navigation in deep space.Considering the negative influence of interstellar dust and cosmic noise in conventional interferometry,intensity correlation interferometry based on statistical optics is possible to overcome those disadvantages and realize high-resolution observation for pulsar.In this thesis,the star-angle intensity correlation interferometry based on spatial modulation is studied.By adjusting the angle of the two scattering screens,the variation of the second-order coherence between the two optical paths can be measured,and the angles of the scattering screens are recorded when the second-order coherence reaches its maximum.Then,the target angle information between the two optical paths can be obtained by exploiting the geometric relationship of the measurement system.However,in practical applications,it is not easy to obtain two scattering screens with identical spatial structures,and it is difficult to satisfy the experimental condition that requires the two single-pixel detectors are completely at the same transverse positions relative to the corresponding scattering screen.Therefore,the star-angle intensity correlation interferometry method via a serpentine optical path is studied.This thesis covers the following work mainly:1.A star-angle intensity correlation interferometry method based on the spatial modulation is proposed,which is verified by theoretical analysis and simulation.Inspired by the HBT(Handury Brown?Twiss)experiment,the expression of the second-order coherence is deduced by the theoretical derivation of angle correlation measurement.The principle validation is performed by simulation,and the influence of the distance from the scattering screen to the single pixel detector on the second-order coherence is analyzed as well as the influence of the lateral coordinate position of the single pixel detector relative to the scattering screen.2.A star-angle intensity correlation interferometry method via a serpentine optical path is proposed,which is validated by the experiments with thermal light and pseudo-thermal light.Similarly to the study of angle correlation measurement through spatial modulation,the correlation between the two optical paths can be also realized with mirrors while using only one scattering screen.By means of thermal light experiment,the theoretical results are verified.The influence of parameter?_gon the measurement is analyzed by pseudo-thermal light experiment,and the precision range of this interferometric method is presented.Both the star-angle intensity correlation interferometry methods proposed in this thesis,based on spatial modulation and the serpentine optical path respectively,are different from other interferometry methods,which are some breakthroughs on the basis of HBT experiments.These two methods are good attempts in the field of second-order interferometry,which is useful for the realization of pulsar's angular position intensity interferometry.