聚偏氟乙烯在重复脉冲激光推进推力测量中的应用

Application of PVDF to Thrust Measurement of Multi-Pulse Laser Propulsion

为获取激光推力器在重复脉冲激光作用下产生推力的变化情况,在对聚偏氟乙烯(PolyVinylidene Flouride,PVDF)进行动态标定的基础上,建立了一套基于PVDF的重复脉冲推力测量装置.在单脉冲能量40 J,重复频率10 Hz的条件下进行了实验,并与半导体应变片的测量结果进行了比较分析,实验结果表明,该测量装置响应速度块、精度高,并有较强的噪音抑制能力,能充分获得脉冲推力在时间上的细微变化;同时发现,在双脉冲激光作用下,实验测量的冲量耦合系数有所减小,这一现象需要进一步的实验研究.

A set of thrust measurement system for multi-pulse laser thrusters was established based on PVDF after the PVDF was calibrated. The experiment was conducted while the single pulse energy was 40 J and the frequency is 10 Hz. Comparison results between the PVDF method and the stain gauge method indicate that the system has preferable effects of response speed, precision and noise-restrain. At the same time, we observed the decrease of impulse coupling coefficient at double laser pulses acting, which needs to further study.