弹体冲击下测量光束的偏摆修正研究

光栅作为瞬态高速激光测速仪测量过程中的合作目标,其表面的技术状态决定了激光多普勒信号的质量.特别是在弹体高速冲击条件下,极易造成光栅内部结构发生损坏,导致反射光无法入射至探测器敏感部.因此,本文采用LS-DYNA仿真软件对砧体结构与光栅的连接处展开分析,并获取表面处的应力应变分布,从而为光栅结构的布置方式提供参考依据....

Research on the Deviation Correction of the Measuring Beam Under the Impact of the Projectile

As a cooperative target in the measurement process of a transient high-speed laser velocimeter, the technical state of the grating surface determines the quality of the laser Doppler signal. Especially under the high-speed impact of the projectile, the internal structure of the grating is easily damaged, and the reflected light cannot be incident on the sensitive part of the detector. Therefore, this paper uses LS-DYNA simulation software to analyze the performance of the connection between the anvil structure and the grating structure, and obtain the stress and strain distribution at the surface, so as to provide a reference for the layout of the grating structure. Secondly, in order to achieve the purpose of correcting the optical path, through the selection and design of the incident lens group, the range of the optimal deflection angle is determined to be 5.2 degrees. This not only solves the problem of large error in the output result caused by beam deflection, but also provides a reference for the optimal design of the grating structure.