摘要
针对高速线阵相机实际应用中的可靠触发问题,提出了一种高速线阵图像采集系统外触发延时时间的测试方法,提供有效触发设置参数,可靠捕获动态目标.采用双区截光幕准确获得飞行目标速度,其中第二个光幕同时提供图像采集外触发信号,依据区截装置参数及目标速度计算出采集系统接收到触发信号时刻;对序列线阵图像分析,以获得实际图像开始采集时刻,进而得到线阵图像采集系统外触发延时时间.对行频64 000的具体型号采集系统外触发延时时间进行了实际测试,测试结果与分析表明,该系统图像采集存在延时,平均延时时间为152μs,方差为3.3μs,延时测试精度小于1个行周期.分析了引入延时测试误差的因素及作用原理,通过10 000lps和50 000lps两种行频的线阵相机延时测试系统误差分析实例,给出了测试系统参数的一般确定方法.
Aiming at effective external trigger of high speed linear image acquisition system in practical application,a trigger delay checkout method was presented,for setting the trigger correctly and getting dynamic target image reliably.A double screens device is used to obtained velocity of dynamic target,the second screen provide trigger signal to linear image acquisition system,the time that system received trigger signal is computed according to target velocity and screens parameters;the time that system start to capture is computed by analysis of sequence linear image captured by system,then trigger delay is checked out.For a specific type linear image acquisition system with 64 000 line per second(lps),trigger delay is measured,the test results analysis show that the linear image acquisition system has external trigger delay,the average delay time is 152μs,the delay variance is 3.3μs,and the delay error is less than 1 line scan cycle.The factors leading to measurement errors and action principle are analysed,and a common method to design measurement system parameters are presented by two external trigger delay measurement precision analysis examples of line scan camera with 10 000 lps and 50 000 lps line scan frequence.
作者
马卫红
田会
董涛
倪晋平
MA Wei-hong;TIAN Hui;DONG Tao;NI Jin-ping(Shaanxi Province Key Laboratory of Photoelectric Measurement and Instrument Technology,Xi’an Technological University,Xi’an 710021,China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2018年第9期153-159,共7页
Acta Photonica Sinica
基金
陕西省科学技术研究发展计划项目(No.2014K05-41)
陕西省教育厅重点实验室科研计划项目(No.15JS036)~~
关键词
延时测量
成像系统
线阵
触发
图像分析
Delay measurement
Imaging system
Line array
Triggers
Image analysis
