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Research on Target Deviation Measurement of Projectile Based on Shadow Imaging Method in Laser Screen Velocity Measuring System

机译：激光屏测速系统中基于阴影成像方法的弹丸目标偏差测量研究

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In the laser screen velocity measuring (LSVM) system, there is a deviation in the consistency of the optoelectronic response between the start light screen and the stop light screen. When the projectile passes through the light screen, the projectile’s over-target position, at which the timing pulse of the LSVM system is triggered, deviates from the actual position of the light screen (i.e., the target deviation). Therefore, it brings errors to the measurement of the projectile’s velocity, which has become a bottleneck, affecting the construction of a higher precision optoelectronic velocity measuring system. To solve this problem, this paper proposes a method based on high-speed shadow imaging to measure the projectile’s target deviation, ΔS, when the LSVM system triggers the timing pulse. The infrared pulse laser is collimated by the combination of the aspherical lens to form a parallel laser source that is used as the light source of the system. When the projectile passes through the light screen, the projectile’s over-target signal is processed by the specially designed trigger circuit. It uses the rising and falling edges of this signal to trigger the camera and pulsed laser source, respectively, to ensure that the projectile’s over-target image is adequately exposed. By capturing the images of the light screen of the LSVM system and the over-target projectile separately, this method of image edge detection was used to calculate the target deviation, and this value was used to correct the target distance of the LSVM to improve the accuracy of the measurement of the projectile’s velocity.
机译：在激光屏速度测量（LSVM）系统中，开始光屏和停止光屏之间的光电响应一致性不一致。当弹丸穿过光幕时，LSVM系统的定时脉冲被触发的弹丸的超目标位置会偏离光幕的实际位置（即目标偏差）。因此，它给弹丸速度的测量带来了误差，这已成为瓶颈，影响了高精度光电速度测量系统的构建。为了解决这个问题，本文提出了一种基于高速阴影成像的方法，用于在LSVM系统触发定时脉冲时测量弹丸的目标偏差ΔS。通过非球面透镜的组合使红外脉冲激光准直，以形成平行激光源，该激光源用作系统的光源。当射弹通过光幕时，射弹的超目标信号将由专门设计的触发电路处理。它利用该信号的上升沿和下降沿分别触发相机和脉冲激光源，以确保弹丸的超目标图像被充分曝光。通过分别捕获LSVM系统的光幕和超目标弹丸的图像，该图像边缘检测方法用于计算目标偏差，并且该值用于校正LSVM的目标距离以改善目标距离。弹丸速度测量的准确性。

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