Angle-of-arrival measurement system with high-frame rate CMOS camera

The frequency spectrum of angle-of-arrival(AOA) fluctuations of laser propagating through atmospheric turbulence is important for the tracking subsystem using in free space optical(FSO) communication system. We present the high frequency spectrum feather of the AOA measuring with high frame rate digital camera. The high frame rate complementary metal oxide semiconductor(CMOS) camera can achieve 3000 frames per second. Therefore it can evaluate the high frequency spectrum of AOA. The sequence of the images and AOA time series for the horizontal and vertical direction are shown in the paper. The system structure and theoretical analysis are also summarized here.