Lengthways and transverse offset of the position of the virtual image relative to the object are analyzed theoretically in
different situations of bi-grating imaging, and an experiment on the verification of the offset is carried out. The result
shows that the position of the virtual image is just behind the object relative to the positive direction of Z axis, the
distance between virtual image and object increases with the increasing of the distance between object and grating G2;
Therefore, the position of virtual image deviates from objects in the X-axis if looking it through grating G2. Thus the
grating G2 and the virtual image are "located on" the same side of the Z-axis.
This paper researches the phenomenon of bi-grating imaging by the computer simulation. The process that white lights
are diffracted by two gratings with different space frequencies is simulated and the imaging characteristics are studied. A
bi-grating imaging relationship is given based on the simulation results. It agrees basically with the experiments.
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