Simultaneous displacement measurement method of multiple targets based on laser self-mixing interference

• 作者: ZHAO Yan ZHANG Ai-ling ZHANG Hai-wei
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Measurement Devices and Methods
• 页码范围: 165-169
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-021-0034-5

摘要

In order to simultaneously measure the displacements of multiple targets,the laser self-mixing interference(SMI)measurement method based on variational mode decomposition(VMD)is proposed.The SMI signal containing the motion information of the external targets is detected by a photodiode.The VMD can non-recursively decompose the mixed SMI signal into SMI signals corresponding to different external targets.The displacement signals can be recon-structed by fringe counting method and interpolation method.The experimental results show that the displacement signals of different external targets can be reconstructed with half wavelength accuracy,which verifies the correctness and feasibility of this method.This method can improve the measurement efficiency,which offers an effective method for the multi-channel displacement measurement.