title: Improving the measurement performance for a self-mixing interferometry-based displacement sensing system.
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.
authors.affiliation: School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong, New South Wales, Australia.
authors.forename: Yuanlong
authors.initials: Y
authors.lastname: Fan
authors.forename: Yanguang
authors.initials: Y
authors.lastname: Yu
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Xi
authors.forename: Joe F
authors.initials: JF
authors.lastname: Chicharo