测量角度对激光干涉测速的影响分析

对现有激光干涉测速技术中不同的照明角度和测量角度进行了分析,讨论了入射激光和反射激光的角度对测速结果的影响,并结合理论分析进行了实验设计和动态测试,测试结果与理论分析吻合,表明倾斜测试时,其测量结果均低于靶的真实运动速度.对于一维运动的平面靶,可以通过测量结果除以测量角度的余弦值进行修正而得到靶的真实运动速度.透镜口径等因数对测速结果的影响在1%以内.

Analysis of Incident Angle and Its Influence on Laser Velocity Interferometry

The different incident angle and measurement angle in velocity interferometry used are classified, the influence of the angle of the incident laser and reflect laser on the results is discussed. The experiments are designed and dymanic testing is carried out. The experiments results are agreed well with the theoretic analyzing. It shows that the velocity measured under tilting goes smaller than the true velocity of the target. To the one dimension movement, the true velocity of the target can be gotten by the experimental results divided by the cosine of the measuring angle. The other factors, such as the diameter of the collecting lens, bring the influence to the results just within 1%.