Measurement of Micro-Vibration Based on Laser Self-Mixing Interference

Hui Fu Luo, Yang Hong Wang, Wei Zhu, Qiang Hua Chen, Huan Wu, Bin Wu Ma, Zhen Feng Zhao

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Laser self-mixing method is very suitable for the measurement of small vibration because of its high precision, simple optical path and better collimation. However, in the measurement of micro-vibration, because of the small amplitude of the object, the low coefficient of the surface and the small amplitude of the measured signal, it caused a great difficulty for the demodulation of the signal with the unobvious inclination of the signal waveform due to the optical feedback. A pre-feedback mirror was added in the self-mixing interference light path to form a feedback optical path system, which could enhance the measurement signal to 2~4 times. At the same time, the frequency and amplitude demodulation algorithm named “fundamental formula-extreme point” was derived and a model was built to realize the demodulation of the signal. The theoretical analysis and experimental results show that the error of the frequency is less than 2.5%, and the error of the amplitude is less than 5%.

Original languageEnglish
Pages (from-to)584-589
Number of pages6
JournalBeijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology
Volume37
Issue number6
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • Extreme point
  • Fundamental frequency
  • Laser self-mixing interference
  • Pre-feedback

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Luo, H. F., Wang, Y. H., Zhu, W., Chen, Q. H., Wu, H., Ma, B. W., & Zhao, Z. F. (2017). Measurement of Micro-Vibration Based on Laser Self-Mixing Interference. Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology, 37(6), 584-589. https://doi.org/10.15918/j.tbit1001-0645.2017.06.007