In this paper, we proposed a high-frequency angular vibration calibration system based on phase modulated laser interferometer technique, which can provide the real-time rotation angle measurement with vibration frequency of up to 1000Hz. The optical configuration, operation principle, and phase generation carrier demodulation (PGC) technique of this calibration system are presented. Both theoretical and experimental results demonstrate that our proposed angular vibration calibration system can realize an angle measurement with an amplitude of 0.3” at angular frequency of 1000Hz.
In order to accurately evaluate the dynamic performance of inertial devices, this paper proposed an angular vibration test system and method for inertial devices based on heterodyne interference technology. This system is mainly composed of the angular vibration excitation device and the angular vibration measurement device. By installing an angular reflector on the swing table, the dual-frequency laser interferometer (DFLI) can measure the real-time angle value of the swing table, then obtain its amplitude-frequency characteristics with the Fast Fourier Transform algorithm . The experimental results show that the test system can measure angular vibrations exceeding 1000 Hz. Furthermore, the frequency bandwidth of an interferometric fiber optic gyroscope (IFOG) fabricated in our laboratory is evaluated by the angular vibration test system aforementioned, and its cut-off frequency is measured as 375 Hz. Finally, a comprehensive theoretical analysis has been implemented to investigate the uncertainty factors in the DFLI of this system.
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