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为了研究大气压强对激光推进耦合系数的影响,设计了一座真空仓,利用真空泵系统控制仓内气压从4.6×103Pa到101.3×103Pa之间变化。采用单脉冲能量为20J的TEACO2激光器,对挂有光船模型的冲击摆进行大气模式激光推进耦合系数的测定。实验发现随着真空仓内气压的上升,冲量耦合系数逐渐增大,当气压值达到34.6×103Pa左右时,冲量耦合系数达到最大,随后伴同气压值的增加冲量耦合系数逐步下降。当入射激光单脉冲能量为10J时,冲量耦合系数的峰值处的气压值略有降低。从激光等离子体冲击波的角度对这一现象进行了初步的分析和解释,预测了能量对冲量耦合系数的峰值影响。
In order to study the influence of atmospheric pressure on the laser propulsion coupling coefficient, a vacuum chamber was designed. The vacuum pressure was used to control the pressure in the chamber from 4.6 × 103Pa to 101.3 × 103Pa. Using a TEACO2 laser with a single pulse energy of 20J, the impact mode of laser propulsion in atmosphere mode was measured for the impact pendulum with the bare ship model. It was found that the impulse coupling coefficient increased with the increase of the pressure in the vacuum chamber. When the pressure reached about 34.6 × 103Pa, the impulse coupling coefficient reached the maximum, and then the impulse coupling coefficient decreased with the increase of the gas pressure value. When the incident laser single pulse energy is 10 J, the pressure value at the peak of the impulse coupling coefficient slightly decreases. This phenomenon was analyzed and explained from the perspective of laser plasma shock wave, and the peak effect of energy impulse coupling coefficient was predicted.