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Optical Engineering

Self-mixing interference signal analysis based on Fourier transform method for vibration measurement
Author(s): Zhen Huang; Xiaogang Sun; Xiaogang Sun; Chengwei Li
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Paper Abstract

An algorithm for analyzing a vibrating target by a dominant harmonic order determination based on Fourier transform in a self-mixing system over wide optical feedback regimes (very weak, weak, and moderate regimes) is presented. The basic frequency of a self-mixing interference signal is used to determine the frequency of vibration, and the dominant harmonic order is proportional to the amplitude of vibration. The algorithm also allows calculation of the correct target movement at extremely low signal-to-noise ratios. The validity of the proposed algorithm was demonstrated by means of simulated signals and confirmed by several experimental measurements. The maximum error of the amplitude is about 0.16 μm and the maximum error of the frequency is about 2.5%. It can be used to demodulate the microscopic vibration of a remote target.

Paper Details

Date Published: 7 May 2013
PDF: 8 pages
Opt. Eng. 52(5) 053601 doi: 10.1117/1.OE.52.5.053601
Published in: Optical Engineering Volume 52, Issue 5
Show Author Affiliations
Zhen Huang, Harbin Institute of Technology (China)
Xiaogang Sun, Harbin Institute of Technology (China)
Xiaogang Sun, Harbin Institute of Technology (China)
Chengwei Li, Harbin Institute of Technology (China)

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