Multiple self-mixing interferometry algorithm based on phase modulation for vibration measurement |
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Authors: | Chunlei Jiang Chengwei Li Shuxin Yin Zhen Huang |
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Affiliation: | 1.School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin,China;2.College of Electrical and Information Engineering,Northeast Petroleum University,Daqing,China;3.School of Physics Science and Technology,Lingnan Normal University,Zhanjiang,China |
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Abstract: | A novel algorithm based on a phase modulation and demodulation technique for multiple self-mixing interferometry was proposed in this paper. This algorithm can measure nanoscale vibration in real time and enhance the measurement resolution of a multiple self-mixing interferometer twofold compared with that of a self-mixing interferometer. In this paper, the principles of the method were described in detail, and a phase equation for multiple self-mixing interferometry was derived. Experiments were confirmed by conducting a series of experiments with different amplitudes, different signal-to-noise ratios, and different vibration waveforms. The experimental results showed that the algorithm can rapidly demodulate vibration in real time and indicated good agreement between theory and experiment. |
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