Real time measurement of the object angular vibration by laser speckles

This paper presents the principle of real time measurement of the object angular vibration by laser speckles and analysis of interference pattern. From the discussion and simulation, some conclusions can be drawn．Ｆirst, relative system the parameter is smaller, the undulation of laser power that was detected is bigger. Its means the signal is better. Second, the undulation of laser power diverges oscillation with the optical receiver aperture increase. The receiving aperture of detector should be adjustable for optimization. Lastly the measurement range of system is restricted by the modulation parameter．