Fan Yuanlong, Yu Yanguang, Xi Jiangtao, Chicharo Joe F
School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong, New South Wales, Australia.
Appl Opt. 2011 Sep 10;50(26):5064-72. doi: 10.1364/AO.50.005064.
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.
据我们所知，本文提出了一些新颖的方法来提高自混合干涉测量法（SMI）在位移测量中的精度性能。首先，研究了SMI系统中观测信号的相关特性，在此基础上提出了一种用于精确估计激光相位的新方法。研究还揭示了现有基于SMI的位移测量技术存在固有误差的原因。然后，本文提出了一种实时估计光反馈水平因子（用C表示）的新方法。结合估计激光相位和更新C值的新算法，本文最终提出了一种与现有技术相比具有更高精度性能的位移测量新技术。所提出的技术通过仿真和实验数据得到了验证。
