In order to improve the dynamic evaluating capabilities of the inertial devices and realize the traceability in angular vibration, the angular vibration calibration devices are developed and it is very important to measure the angular vibration accurately for calibration devices. In this paper, a new diffraction grating heterodyne laser interferometer method was introduced for high-frequency and micro-amplitude angular-vibration measurement, which uses a differential and symmetrical optical-path arrangement. The proposed method has the advantages of high-precision, high anti-interference and convenient debugging, and could achieve the angular measurement resolution within 0.02″.
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