基于复摆模型的高速摄影冲量耦合系数测量方法
High speed photography measurement of impulse coupling coefficient based on compound pendulum model
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摘要: 提出了一种基于复摆模型的高速摄影冲量耦合系数测量方法，冲量缓慢加载时由编码器标定复摆的系统参数，脉冲激光瞬态作用冲击加载时由高速相机测量最大摆角，有效地解决了编码器由于振动干扰无法进行角度判别的问题。实验测量结果表明：系统参数标定相对误差低于2.8%，冲击加载时冲量耦合系数测量结果具有很好的重复性，在(32.3～32.9)×10-5 N·s·J-1范围内，与国外报道的同类构型激光推力器数据吻合。Abstract: Based on compound pendulum model, a new way is put forward to measure impulse coupling coefficient using high speed photography. The system parameters of the compound pendulum are demarcated by an encoder when impulse is loaded slowly, and after the pulsed laser impacting the pendulum, the maximum angle is measured by CCD camera when impulse is loaded instantaneously, which efficiently solves the problem that the encoder can not distinguish angles due to vibration in the experiment. The result shows that the relative error of demarcating system parameter is below 2%. The results of impulse coupling coefficient have good repeatability with the range of (32.3～32.9)×10-5 N·s·J-1, which is consistent with the data reported by foreign authors for similar laser thruster.
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