Swept source optical fibre interference technology for vibration detection

In order to realize the micro vibration detection of mechanical parts, a set of vibration detection system of Swept Source Optical Coherence Tomography (SS-OCT) system is set up in this paper. the vibration detection principle of optical fiber SS-OCT system is analyzed, and the numerical relationship between optical path difference and spectral signal oscillation frequency of OCT system is obtained. The phase difference method of All-phase Fast Fourier transform (apFFT) spectrum analysis and OCT ranging technology are combined to improve the displacement resolution of the system. Through the calibration of the nanoscale displacement table, the system can achieve the nanoscale displacement resolution, and the feasibility of the SS-OCT system for vibration detection is verified.