摘要
针对短靶距测速光幕靶的靶距无法直接测量的问题,提出一种采用双区截光幕测速装置标定靶距的方法。在测得弹道上两点速度后,依据弹道方程推导了飞行弹丸在两点间任意时刻的瞬时速度计算式;依据弹丸穿过标定用测速装置和被标定光幕靶的时间序列,给出了靶距标定公式。在弹丸飞行速度一定的情况下,分析标定用光幕靶的靶距和布放间距对标定误差的影响,并进行了实弹射击试验。试验结果表明,标定用光幕靶的靶距、布放间距及弹丸飞行速度在一定条件下,标定相对误差为0.8‰,所提方法能够用来标定各种原理的使用级区截测速用传感器的靶距。
Light screen is a photoelectric test equipment that adopts the principle of measuring the flying time in a fixed distance,commonly used to measure the flying velocity of projectile which also known as the initial velocity of projectile near the muzzle.For the same diameter projectile,distance measurement error is the main factor affecting the velocity measurement error when timing error is determined.Direct measurement methods such as steel rules and laser range finders are used to measure long target distance greater than 1 m in light screen,and measurement error of distance is generally 0.5 mm,the relative error of distance is not more than 0.5‰,which has little impact on the relation error of velocity measurement.For light screen of short target distance with target distance less than 200 mm,the above method is still used to measure distance,and the distance relative error is greater than 2.5‰,then the relative error of velocity measurement exceeds 2.5‰,which does not meet the requirements of the actual velocity measurement.In this paper,a target distance calibration method using the dual zone-block velocity measuring device is proposed,which consists of two sets of calibration light screens with the same principle.The target distances of the two sets of light-screen are consistent and much larger than the distances of calibrated light screens.Based on the transmission formula of velocity measurement error,a calculation method of minimum calibration distance under the determination of that error is given.Two sets of light screen are utilized for calibration to measure the velocity of the flying projectile at two points on the ballistic separated by a fixed distance.Combined with the distance between two points,the resistance parameters of projectile and instantaneous velocity at any time between two points are developed based on the ballistic equation.Based on the fact that the average velocity within a certain distance is equal to the instantaneous velocity at the midpoint of projectile flying time with
作者
李敬
孙忠辉
倪晋平
田会
LI Jing;SUN Zhonghui;NI Jinping;TIAN Hui(School of Opto-electronic Engineering,Xi′an Technological University,Xi′an 710021,China;Chinese People′s Liberation Army 63853 Unit,Baicheng 137001,China;Shaanxi Province Key Laboratory of Photoelectric Measurement and Instrument Technology,Xi′an 710021,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2024年第2期140-149,共10页
Acta Photonica Sinica
基金
国家自然科学基金(No.61471289)。
关键词
速度测量
光幕靶
标定
阻力参数
误差传递
Velocity measurement
Light screen
Calibration
Resistance parameter
Error transmission
