基于应变片的双脉冲推力测量初步实现

为了获得激光推力器在多脉冲激光作用下产生推力的变化情况,建立了一套基于半导体应变片技术的双脉冲推力测试系统,介绍了系统标定及测试原理。在单脉冲能量80 J,重复频率10 Hz的条件下进行了实验,实验结果表明:该测试系统响应速度快、精度高,实验结果可信;同时发现,在双脉冲激光作用下,推力器产生的脉冲推力大小和推力的持续时间均会减小,冲量耦合系数也有所降低,与文献报道实验测量结果基本一致,对激光发动机的理论和数值研究具有一定的参考价值。

Realization of measurement of double-pulse thrust based on stain gauge

To acquire the transformation of thrust with multi-pulse laser,a set of double-pulse thrust measurement system is established based on semiconductor strain gauge technology.Force produced by laser thruster is tested and analyzed with multi-pulse laser,whose single pulse energy is 80 J and frequency is 100 Hz.Results indicate that the measurement system is both suitable and credible.Decrease of thrust and impulse coupling coefficient is observed,which is in good agreement with the experimental results reported by other literatures.