针对传统的弹着点坐标测试手段需要人工判读、效率低、精度差,现有方法存在结构复杂、稳定差等问题,提出了 N 形光幕弹着点坐标测试的方法。该方法以矩形激光光幕作为模块单元拼接形成大面积 N 型光幕,根据弹丸到达各个光幕的时间及相对几何关系获得 X 方向坐标,采用高速相机成像获取Y 方向坐标。同时可完成弹丸速度参数的测试。理论分析表明,单个模块采用532 nm,20 mW 激光器可满足高速相机灵敏度的需求,理想坐标测试精度可优于±2.5 mm。比对实验表明,反射成像法优于透射成像法,线阵高速相机在行频为200 kHz 时,对4 mm 模拟弹丸可清晰成像。%Aim at disadvantages of traditional impact coordinates test methods such as artificial interpretation, low efficiency,poor precision,and the existing methods were of complex structure,lack of stability,we pro-posed a new method based on the N shape laser screen.This method took rectangular laser screen as a module unit spliced into a large N shape laser screen,obtained the X coordinate according to the time at which the pro-jectile reaches each screen and the relative geometric relationship,achievd the Y coordinate by means of the re-flective imaging of high speed camera.At the same time the velocity measurement of projectile was achieved. The theoretical analysis indicate that by using 532 nm,20 mW laser the demand of the sensitivity of high-speed camera could be met,and the accuracy of ideal coordinate measurement was ± 2.5mm higher.Comparative ex-periments showed that reflective imaging method was better in transmission.When the line frequency of linear speed camera was 200 kHz,it could achieve clear image for simulate projectile whose diameter was 4mm.
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