摘要
针对终点弹道段弹丸散布区域大,常规天幕靶存在有效测量靶面小、探测灵敏度不足等问题导致末速测量失效的情况,提出采用不同焦距镜头的广角靶在两个位置点共面拼接大面积测速光幕的方法。分析单镜头天幕靶的镜头物距设定在不同弹道高度对探测灵敏度的影响,推导相对灵敏度公式,确定在随机弹道高度下天幕靶物距设置为无穷远,则整体灵敏度随弹道高度变化趋势平缓,并进行实弹验证。基于此,研究以一定间距放置2台不同视场角的广角靶共面拼接大面积探测区域的方法,并进行仿真分析。仿真结果表明,针对30mm弹丸,间隔22m放置视场角为66°和40°的广角靶,可形成10m×10m的测速区域。研究可为天幕靶在终点弹道段使用提供一种工程方法。
In view of the large dispersion area of the projectile in the terminal ballistic section,and the failure of terminal velocity measurement due to issues such as small effective measurement area and insufficient detection sensitivity of conven⁃tional sky screen,a method is proposed to coplanarly splice a large-area velocimetry light screen by using wide-angle sky screen equipped with lenses of different focal lengths at two position.The influence of the lens object distance of a single-lens sky screen set to different ballistic heights on detection sensitivity is analyzed,the relative sensitivity formula is derived,and live-fire verification is carried out.It is found that when the object distance of the sky screen is set to infinity at a random bal⁃listic height,the sensitivity of the overall area changes gently with the ballistic height.On this basis,a method of coplanarly splicing a large-area detection region by placing two wide-angle sky screens with different field angles at a certain interval is studied,and simulation analysis is done.Simulation results show that for a 30mm projectile,a velocity measurement area of 10m×10m can be formed by placing wide-angle sky screens with field angles of 66°and 40°at an interval of 22m.This study can provide an engineering approach for the use of sky-screen in the terminal ballistics segment.
作者
廖上
倪晋平
LIAO Shang;NI Jinping(School of Opto-electronic Engineering,Xi’an Technological University,Xi’an 710021,China;Shaanxi Province Key Laboratory of Photoelectric Measurement and Instrument,Xi’an 710021,China)
出处
《光学技术》
北大核心
2025年第6期698-703,共6页
Optical Technique
基金
国家自然科学基金项目(61471289)。
关键词
兵器试验
外弹道测试
天幕靶
拼接光幕
探测灵敏度
ordnance test
external ballistic test
sky screen
splicing light screen
detection sensitivity
