It is the foundation to realize closed loop control that the FAST telescope feed cabin-cable's location and vibration frequency are dynamically measured. Due to the fact that traditional measurement methods for FAST telescope cabin-cable scaled model's vibration frequency measuring are of complicated operation, large disturbance, and difficult to realize, a high-speed dynamic frequency-measuring method based on binocular camera is put forward to cope with the characteristics of continuous changes in the vibrating object to be measured, It calculates object's three-dimensional coordinates, and uses fast Fourier transform to obtain the spectrum of real-time discrete point locations. Then the vibration frequency is analyzed. Experiments show that in the case of frequency's resolution being 0.04 Hz, the repeated measurement and time-segmented measuring errors of binocular camera high-speed dynamic frequency measuring are not greater than 0.08 Hz and 0.04 Hz, respectively, indicating that for low frequency vibrating objects like the feed cabin cable, this method can effectively satisfy the requirement of dynamic frequency measuring.

FAST cabin-cable system  /  vibration frequency  /  method of binocular camera high-speed dynamic frequency measuring  /  FFT