Micro-vibration parameters fast demodulation algorithm and experiment of self-mixing interference

Abstract

Self-mixing interference (SMI) technique can be used for measuring vibration, displacement, velocity and absolute distance. In this paper, a simple demodulation algorithm for fast measuring frequency and amplitude of a simple harmonic vibration target is proposed based on the basic theoretical model of self-mixing interference effects. The simulative results show that the error between the vibration parameters which are demodulated by this algorithm and initial settings merely results from the sample rate. Further, the experimental system of self-mixing vibration measurement is built. The experimental results have a good agreement with simulation analyses. The maximum error of frequency demodulation is less than 1 Hz in our experiment.

Keywords

External Object / Reverse Point / Optical Feedback / Vibration Parameter / Vibration Displacement

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This work has been supported by the National Natural Science Foundation of China (No.61308048), the Natural Science Foundation of Fujian Province (No.2013J01244), and the Li Shangda Foundation in discipline construction (No.C513030).