On Two Fourier Transform-Based Methods for Estimation of Displacement and Parameters of Self-Mixing Interferometry Over Major Optical Feedback Regimes

Khan, Junaid Iqbal; Zabit, Usman

doi:10.1109/jsen.2021.3062550

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…Self-mixing interferometry (SMI) is simpler than traditional interferometry because many optical elements, such as the beam splitter, reference mirror and external photodetector, are not required. Based on SMI, many smart and simple sensing systems have been developed [8][9][10][11][12][13][14][15]. Similar to traditional dual-beam interferometry, most SMI can only measure one-dimensional displacement, and the measurement accuracy strongly depends on the wavelength stability.…”

Section: Introductionmentioning

confidence: 99%

Self-Mixing Interferometry Cooperating with Frequency Division Multiplexing for Multiple-Dimensional Displacement Measurement

et al. 2023

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In this study, a multiple-dimensional displacement measurement technology is demonstrated by using self-mixing interferometry (SMI) cooperating with a frequency division multiplexing (FDM) technique. The proposed SMI configuration with a single laser generates three modulated light beams with different carrier frequencies. Each beam is incident on a planar grating with its own auto-collimation diffraction angle. The diffracted beams return to the laser cavity and then self-mixing interference occurs. An algorithm based on FDM is developed for multiple-dimensional displacement reconstruction from a single SMI signal. Experiments are conducted to verify the proposed approach. This paper shows an attractive sensing system for multiple-dimensional displacement featuring compact configuration, high resolution and better immunity to environmental disturbances.

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