Method of high speed flow field influence and restrain on laser communication

Li-xin Meng; Chun-hui Wang; Cun-zhu Qian; Shuo Wang; Li-zhong Zhang

doi:10.1117/12.2034708

21 August 2013 Method of high speed flow field influence and restrain on laser communication

Li-xin Meng, Chun-hui Wang, Cun-zhu Qian, Shuo Wang, Li-zhong Zhang

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 890623 (2013) https://doi.org/10.1117/12.2034708
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

For laser communication performance which carried by airplane or airship, due to high-speed platform movement, the air has two influences in platform and laser communication terminal window. The first influence is that aerodynamic effect causes the deformation of the optical window; the second one is that a shock wave and boundary layer would be generated. For subsonic within the aircraft, the boundary layer is the main influence. The presence of a boundary layer could change the air density and the temperature of the optical window, which causes the light deflection and received beam spot flicker. Ultimately, the energy hunting of the beam spot which reaches receiving side increases, so that the error rate increases. In this paper, aerodynamic theory is used in analyzing the influence of the optical window deformation due to high speed air. Aero-optics theory is used to analyze the influence of the boundary layer in laser communication link. Based on this, we focused on working on exploring in aerodynamic and aero-optical effect suppression method in the perspective of the optical window design. Based on planning experimental aircraft types and equipment installation location, we optimized the design parameters of the shape and thickness of the optical window, the shape and size of air-management kit. Finally, deformation of the optical window and air flow distribution were simulated by fluid simulation software in the different mach and different altitude fly condition. The simulation results showed that the optical window can inhibit the aerodynamic influence after optimization. In addition, the boundary layer is smoothed; the turbulence influence is reduced, which meets the requirements of the airborne laser communication.

Citation Download Citation

Li-xin Meng, Chun-hui Wang, Cun-zhu Qian, Shuo Wang, and Li-zhong Zhang "Method of high speed flow field influence and restrain on laser communication", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 890623 (21 August 2013); https://doi.org/10.1117/12.2034708

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