Investigation On The Image Of Plane Arc Varied Line Space Grating And Its Combined System

Bi-grating system combined by two plane gratings or one periodic plane grating and one plane varied line space(PVLS)grating can bypass obstacles of objects into a clear image,which has a unique dispersion-combination of spectral imaging effect.It is also very important to study bi-grating system made up with two PVLS gratings.Therefore,the imaging character and rules from F-F grating system are investigated in the paper,which is hoped to provide a reference for its application in some fields.In this paper,the theory of dissipative condition of PVLS grating is studied,and then the factors influencing the focal length of the PVLS grating are analyzed theoretically and two series of gratings are prepared in the lab.The imaging law of the object composed of F-F grating system is studied by using the self-made gratings.The relationship between the position of the two gratings、the object and image distance,and the magnification are studied。It is showed that the shape,distance and angle of the two coherent light have some influence on the focal length of the PVLS grating when it is made.Under certain conditions,there is a converging beam formed from observation multi-color light through the F-F grating system including real image and virtue image with different wavelengths.The ratio of the position of the two gratings to the origin is inversely proportional to the spatial frequency of the two gratings when the converging spectrum beam is realized.When forming virtue image,image distance and amplification increased with the increasing of object distance;while forming real image,image distance and amplification decreased with the increasing of object distance.Finally,according to the characteristics of the F-F grating system to real image,the imaging system is designed to realize the image separation.