Essence tracing subsystem for laser communication tracking system

Abstract

The invention relates to an accurate track subsystem of free space laser communication system, which comprises a lens vibration motor 1, a scanning mirror 2, a scanning mirror 3, a lens vibration motor 4, a F-theta lens 5, a high frame frequency camera 6 and a control system 7. The invention uses the motor 1, scanning mirror 2, scanning mirror 3, and motor 4 to form a two-dimension lens vibration assembly to realize the motion in two-dimension space, and uses the two-dimension lens vibration assembly and the F-theta lens 5 to form a new fine adjustment mechanism to expand track range, with confirmed track precision and track speed, while the maximum track range can reach +-5 degrees and the cost is reduced 35-40%.

Description

technical field [0001] The invention relates to a fine tracking subsystem in a free space laser communication system Background technique [0002] The laser communication tracking system is divided into two subsystems, a rough tracking system and a fine tracking system, and the present invention is the fine tracking subsystem in the laser communication tracking system. The fine tracking subsystem in the existing laser communication tracking system is driven by piezoelectric ceramics, that is, PZT. As shown in Figure 1, the system uses a two-dimensional PZT driver 9 to drive a two-dimensional tilting mirror 10. The tilting mirror 10 reflects the incident laser beam 8 to the four-quadrant photodetector 11, converts the optical signal into an electrical signal through the four-quadrant photodetector 11 and sends it to the control system 12, and then the control system 12 outputs the control signal to the two-dimensional PZT driver 9. The position of the two-dimensional tilting...

AI Technical Summary

Problems solved by technology

The fine tracking subsystem in the existing laser communication tracking system is driven by piezoelectric ceramics, that is, PZT. As shown in Figure 1, the system uses a two-dimensional PZT driver 9 to drive a two-dimensional tilting mirror 10. The tilting mirror 10 reflects the incident laser beam 8 to the four-quadrant photodetector 11, converts the optical signal into an electrical signal through the four-quadrant photodetector 11 and sends it to the control system 12, and then the control system 12 outputs the control signal to the two-dimensional PZT driver 9. The position of the two-dimensional tilting mirror 10 is adjusted by the two-dimensional PZT driver 9, thereby realizing precise tracking of the laser source; the advantages of the system in Figure 1 are small size, high precision, and fast response speed; the disadvantage is that the working range is small, and currently The maximum working range of the PZT type high-precision tracking system is 7′, it is easy to lose the light source, and the cost is very high

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