Structural vibration monitoring based on optical coherence tomography
                                      HUANG Yuexin1, ZHANG Qiukun1, FU Xibin2, HUANG Xuebin2, ZHONG Shuncong1,3
(1.School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China;2.Xiamen Special Equipment Inspection Institute, Xiamen 361000, China; 3.School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072,China)

Abstract: Aiming at the proplem of vibration measurement technologies using noncontact optical measuring devices, a system of vibration measurement based on frequencydomain optical coherence tomography (OCT) was investigated, which vibration signals measured by recording the change of displacement with time. It was found that the blurring of interference fringes collected by spectrometer was related to the instantaneous velocity of detected, the maximum frequency which is measurable by the system was increased with the decrease of exposure time of the CCD camera. A signal generated by vibration exciter driven of a function signal generator was tested. The results indicate that the OCT is an effective optical noncontact measuring technology for the vibration measurement, it has great potential applications in the vibrationbased structural health monitoring.

Key words: optical coherence tomography (OCT); vibration measurement; exposure time；structural health monitoring