Land-based facilities vibration monitoring system based on laser Doppler effect

Several vibration monitoring methods were compared. The basic principle of laser Doppler vibration monitoring was elaborated. A new kind of laser Doppler vibration monitoring system(LDVMS) that used for the small-size land-based facilities of launch site was designed. High precision PDV100-type LDVMS was used in the experiment. The electrodynamic loudspeaker, which was selected to simulate the frequency character of the small-size land-based facilities of launch site, its amplitude and vibration frequency were investigated as two important characteristic parameters. The analysis of experiment results show that the relative error of the vibration frequency is less than 0.4%, the amplitude can reach 1 m order of magnitude. The character of the designed LDVMS satisfies the need of launch site.