Self-mixing interferometry for rotational speed measurement of servo drives

Hui Sun, Ji Gou Liu, Quan Zhang, Ralph Kennel

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Self-mixing interferometry (SMI) is an efficient technique applied to measure distance, velocity, displacement, and vibration. In this work, a compact and low cost SMI is applied to measure the rotational speed of a servo drive up to 6000 RPM. The application of SMI to rotational speed measurement of servo drives instead of the usage of incremental encoders is proposed. TheDoppler frequency is obtained via analysis on the power spectral density, which is estimated by the smoothing periodogram method based on the fast Fourier transformation. The signals are processed in MATLAB and LABVIEW, showing that the SMI can be applied to dynamic rotational speed measurement of servo drives. Results of experiments demonstrate that this system is implementable for rotational speed measurement over the whole range from 3 RPMto 6000 RPM. In addition, the system used to measure rotational speed can also accurately record changes in position without integrating the velocity.

Original languageEnglish
Pages (from-to)236-241
Number of pages6
JournalApplied Optics
Volume55
Issue number2
DOIs
StatePublished - 10 Jan 2016

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