A method for measuring the damping coefficient of vibrating target based on Fourier transform of self-mixing interference signal is presented. Theoretical researches indicate, the dominant harmonic order of the laser self-mixing signal is proportional to the amplitude of vibration. Based on this theory, damping efficient can be extracted from the ratio between the amplitudes of the vibration target at different moments. The error of the damping coefficient is about 4%.This method characterized by simple structure, non-contact measurement and high accuracy, can be extensively applied in measurement of industrial harmonic damping vibration.
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