Abstract: The measurement principle of tiny-angle using laser interference method is introduced.This method is used to measure micro-impulse.The impulse can be obtained by measuring tiny rotation-angle of torsion pendulum.The micro-impulses are measured with a torsion pendulum using PVC+2%C as target under the same single pulse energy condition.The experimental results indicate that the resolution of measurement system is of 2×10-8N·s and the range is between 2×10-7 and 0.8×10-5 N·s.

Key words: Micro-impulse measurement;Torsion pendulum;Laser interference;Tiny-angle measurement;Micro-laser plasma thrusters

摘要： 介绍了激光干涉法测微小转角的原理及测量方法,提出了采用激光干涉测量微冲量的方法,将激光与靶作用产生的微冲量转化为扭摆的转动角度,通过激光干涉法测量此微小转角从而计算出冲量。相同单脉冲能量下,以PVC+2%C为工质,用扭摆法测量了激光与工质作用产生的微冲量,结果表明该测试系统分辨率为2×10-8N.s,量程为2×10-7～0.8×10-5N.s。

关键词: 微冲量测量;扭摆;激光干涉;小角度测量;激光微推力器