A 3D nano-displacement measurement method,where the difference in phase between the beams in a four-beam laser interference is changed,is proposed.Simulation results demonstrate that the variation of phase difference ...A 3D nano-displacement measurement method,where the difference in phase between the beams in a four-beam laser interference is changed,is proposed.Simulation results demonstrate that the variation of phase difference causes the deviation of the interference pattern in the laser interference system.Based on this theory,we design and build a four-beam laser interference system.The corner cube prism in the optical path is shifted,and the phase of the beam is changed by applying different voltages to a piezoelectric stage.The phase difference is obtained by analyzing the lattice pattern with subpixel precision,and then the displacement is determined by correlation operation.The experimental measurement results are consistent with the theoretical analysis,thereby verifying the feasibility of this measurement method.展开更多
基金supported by National Key R&D Program of China(No.2023YFE0108900)Horizon Europe Program(L4DNANO No.101086227)+1 种基金Jilin Provincial Science and Technology Program(Nos.20210101393JC,20210101069JC,20210101038JC,2020C022-1,20190201287JC and 20190702002GH)“111”Project of China(No.D17017).
文摘A 3D nano-displacement measurement method,where the difference in phase between the beams in a four-beam laser interference is changed,is proposed.Simulation results demonstrate that the variation of phase difference causes the deviation of the interference pattern in the laser interference system.Based on this theory,we design and build a four-beam laser interference system.The corner cube prism in the optical path is shifted,and the phase of the beam is changed by applying different voltages to a piezoelectric stage.The phase difference is obtained by analyzing the lattice pattern with subpixel precision,and then the displacement is determined by correlation operation.The experimental measurement results are consistent with the theoretical analysis,thereby verifying the feasibility of this measurement method.
