线阵图像采集系统外触发延时时间的确定

马卫红; 田会; 董涛; 倪晋平

doi:doi:10.3788/gzxb20184709.0911002

光子学报, 2018, 47 (9): 0911002, 网络出版: 2018-09-15

线阵图像采集系统外触发延时时间的确定

Checkout of External Trigger Delay in Linear Image Acquisition System

论文大纲

马卫红田会董涛倪晋平

作者单位

西安工业大学陕西省光电测试与仪器技术重点实验室, 西安 710021

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

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152 μs, 方差为3.3 μs, 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10 000 lps和50 000 lps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.

Abstract

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 152 μs, the delay variance is 3.3 μs, 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.

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马卫红, 田会, 董涛, 倪晋平. 线阵图像采集系统外触发延时时间的确定[J]. 光子学报, 2018, 47(9): 0911002. MA Wei-hong, TIAN Hui, DONG Tao, NI Jin-ping. Checkout of External Trigger Delay in Linear Image Acquisition System[J]. ACTA PHOTONICA SINICA, 2018, 47(9): 0911002.

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