Improving the measurement performance for a self-mixing interferometry-based displacement sensing system

Yuanlong Fan, Yanguang Yu, Jiangtao Xi, Joe Chicharo

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Approaches that are, to our knowledge, novel, are proposed in this paper to improve the accuracy performance of self-mixing interferometry (SMI) for displacement measurement. First, the characteristics associated with signals observed in SMI systems are studied, based on which a new procedure is proposed for achieving accurate estimation of the laser phase. The studies also revealed the reasons for the inherent errors associated with the existing SMI-based techniques for displacement measurement. Then, this paper presents a new method for estimating the optical feedback level factor (denoted by C) in real time. Combining the new algorithms for estimating the laser phase and updating C value, the paper finally presents a novel technique for displacement measurement with improved accuracy performance in contrast to existing techniques. The proposed technique is verified by both simulation and experimental data.
    Original languageEnglish
    Pages (from-to)5064-5072
    JournalApplied Optics
    Volume50
    Issue number26
    DOIs
    Publication statusPublished - Sep 2011

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